Gas-Fired Natural Draft Hot Water Boilers INSTALLATION INSTRUCTIONS These instructions must be affixed on or adjacent to the boiler

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1 D E S I G N E D T O L E A D AWR Series Gas-Fired Natural Draft Hot Water Boilers INSTALLATION INSTRUCTIONS These instructions must be affixed on or adjacent to the boiler Models: AWR038 AWR070 AWR105 AWR140 AWR175 AWR210 AWR245 AWR280 Equipped with Honeywell S9361A Control System WARNING: Improper installation, adjustment, alteration, service or maintenance can cause property damage, injury, or loss of life. For assistance or additional information, consult a qualified installer, service agency or the gas supplier. Read these instructions carefully before installing Manufacturer of Hydronic Heating Products P.O. Box I. Street Philadelphia, PA

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3 WARNINGS FOR THE HOMEOWNER FOLLOW ALL INSTRUCTIONS and warnings printed in this manual and posted on the boiler. INSPECT THE BOILER ANNUALLY. To keep your boiler safe and efficient, have a service technician follow the Service checklist near the end of this manual. IF YOU ARE NOT QUALIFIED to install or service boilers, do not install or service this one. THE BOILER MAY LEAK WATER at the end of its useful life. Be sure to protect walls, carpets, and valuables from water that could leak from the boiler. PROTECT YOUR HOME IN FREEZING WEATHER. A power outage, safety lockout, or component failure will prevent your boiler from lighting. In winter, your pipes may freeze and cause extensive property damage. Do not leave the heating system unattended during cold weather unless alarms or other safeguards are in place to prevent such damage DO NOT BLOCK AIR FLOW into or around the boiler. Insufficient air may cause the boiler to produce carbon monoxide or start a fire. KEEP FLAMMABLE LIQUIDS AWAY from the boiler, including paint, solvents, and gasoline. The boiler may ignite the vapors from the liquids causing explosion or fire. KEEP CHILDREN AND PETS away from hot surfaces of the boiler, boiler piping, and vent pipe. CARBON MONOXIDE (CO) is an odorless, deadly gas that may be introduced into your home by any malfunctioning fuel-burning product or vent system failure. Consider installing CO alarms near bedrooms in all levels of the building to warn you and your family of potential CO exposure. WARNINGS FOR THE INSTALLER READ THIS ENTIRE MANUAL before attempting installation, start-up, or service. Improper installation, adjustment, alteration, service, or maintenance may cause serious property damage, personal injury, or death. DO NOT DISCONNECT PIPE FITTINGS on the boiler or in the heating system without first verifying that the system is cool and free of pressure and that your clothing will protect you from a release of hot water or steam. Do not rely solely on the boiler s temperature and pressure gage when making this judgment. USE PROPER PERSONAL PROTECTION EQUIPMENT when servicing or working near the boiler. Materials of construction, flue products, and fuel contain alumina, silica, heavy metals, carbon monoxide, nitrogen oxides, and/or other toxic or harmful substances that can are hazardous to health and life and that are known to the State of California to cause cancer, birth defects, and other reproductive harm. INSTALL ALL GUARDS, cover plates, and enclosures before operating the boiler. SIZE THE BOILER PROPERLY relative to the design heat load or, if using domestic hot water priority, the peak hot water load, whichever is larger. A grossly oversized boiler will cycle excessively and this will lead to premature failure of the boiler and its components. Our warranty does not apply to damage from excessive cycling. ADHERE TO ALL LOCAL CODE REQUIREMENTS. Contact your local code inspector prior to installation. In the absence of a local code, adhere to the National Fuel Gas Code ANSI Z223.1/NFPA 54 or CAN/CSA B149.1, Natural Gas and Propane Installation Code. ALL WIRING must comply with the National ElectrIcal Code ANSI/NFPA 70 (in the USA) or the Canadian Electrical Code CSA C22.1 (in Canada) and any local regulations. 1

4 Table of Contents I. Product Description... 3 II. Specifications... 3 III. Before Installing... 4 IV. Locating the Boiler... 4 V. Air for Combustion & Ventilation... 6 VI. Venting VII. Gas Piping VIII. System Piping IX. Wiring X. Start-Up & Checkout XI. Operation XII. Service & Maintenance XIII. Troubleshooting XIV. Parts

5 I Product Description The AWR series boiler is a cast iron gas fired water boiler designed for use in closed forced circulation heating systems. This boiler is a Category I drafthood equipped appliance, which must be vented by natural draft using a lined masonry or listed metal chimney system. An adequate supply of air for combustion, ventilation and dilution of flue gases must be available in the boiler room. II Specifications FIGURE 2.1: GENERAL CONFIGURATION BASIC BOILER MODEL TABLE 2.2: SPECIFICATIONS RATINGS - NATURAL AND LP GASES NUMBER OF SECTIONS INPUT HEATING CAPACITY Notes: The Net AHRI Water Ratings shown are based on a piping and pickup allowance of The manufacturer should be consulted before selecting a boiler for installations having unusual piping and pickup requirements, such as intermittent system operation, extensive piping systems, etc. Add Suffix N for Natural Gas or Suffix L for Propane Gas to basic AWR Boiler Model shown (Example: AWR210EN, AWR210EL) 3 NET AHRI RATING, WATER AFUE DIMENSIONS (INCHES) A B C MBH MBH MBH % AWR038E /4 31-1/2 4 AWR070E /8 31-1/2 4 AWR105E /8 31-1/2 5 AWR140E /2 31-1/2 6 AWR175E /2 31-3/4 7 AWR210E /8 33-1/2 7 AWR245E /8 33-1/2 8 AWR280E /4 33-1/2 8

6 III Before Installing 1) Safe, reliable operation of this boiler depends upon installation by a professional heating contractor in strict accordance with this manual and the requirements of the authority having jurisdiction. In the absence of an authority having jurisdiction, installation must be in accordance with this manual and the National Fuel Gas Code, ANSI Z223.1-latest edition. Where required by the authority having jurisdiction, this installation must conform to the Standard for Controls and Safety Devices for Automatically Fired Boilers (ANSI/ASME CSD-1)-latest edition. 2) Make sure that a properly sized chimney is available which is in good condition. Consult the authority having jurisdiction, Part VI of this manual, and the National Fuel Gas Code for additional information on venting requirements. 3) Make sure that the boiler is correctly sized: For heating systems employing convection radiation (baseboard or radiators) use an industry accepted sizing method such as the I=B=R Guide RHH published by the Air-Conditioning, Heating and Refrigeration Institute (AHRI). For new radiant heating systems refer to the radiant tubing manufacturer s boiler sizing guidelines. For systems including a Crown Mega-Stor indirect water heater, size the boiler to have either the Heating Capacity required for the Mega-Stor or the I=B=R Net Rating required for the heating system, whichever results in the larger boiler. For systems that incorporate other indirect water heaters, refer to the indirect water heater manufacturer s instructions for boiler output requirements. 4) Make sure that the boiler received is configured for the correct gas (natural or LP). 5) Boilers built for installations at altitudes above 2000 ft. require different main burner orifice. Make sure that the boiler is configured for use at the correct altitude. IV Locating the Boiler WARNING FAILURE TO OBSERVE THE FOLLOWING LOCATION REQUIREMENTS COULD RESULT IN A FIRE, EXPLOSION OR CARBON MONOXIDE (CO) HAZARD. 1) Clearances: Observe minimum clearances shown below to avoid potential fire hazard. These clearances apply to all combustible construction as well as noncombustible walls, ceilings and doors. Also see Figures 4.1 and 4.2. Front (AWR ) - 6 Front (AWR ) - Alcove Left Side - 1 (requires relocation of relief valve to right hand side of boiler - Figure 8.2) Right Side - 4 Rear - 6 Top /2 Additional Height May Be Required To Maintain 6 Clearance From All Breeching Components A 24 service clearance from the jacket is recommended on the left, right, and front of the boiler. These clearances may be reduced to those shown in Figures 4.1 & 4.2, however servicing the boiler will become increasingly difficult as these service clearances are reduced. 4

7 FIGURE 4.1: AWR MINIMUM CLEARANCE FROM BOILER TO ALL TYPES OF COMBUSTIBLE CONSTRUCTION AND NONCOMBUSTIBLE CEILINGS, WALLS AND DOORS (CLOSET) FIGURE 4.2: AWR MINIMUM CLEARANCE FROM BOILER TO ALL TYPES OF COMBUSTIBLE CONSTRUCTION AND NONCOMBUSTIBLE CEILINGS AND WALLS (ALCOVE) 5

8 2) The boiler must be installed on a hard level surface. This surface may be combustible. 3) Do not install this boiler in a location where gasoline or other flamable vapors or liquids will be stored or used. 4) Do not install this boiler in an area where large amounts of airborne dust will be present, such as a workshop. 5) The boiler should be located as close to the chimney as possible. 6) Do not install this boiler over carpeting. This may cause a fire. 7) Do not install this boiler directly on a surface that may get wet. Raise the boiler on a pad. 8) Protect ignition system components from sources of water that may spray, drip or rain on them during installation or service. 9) Level boiler using shims as necessary. V Air for Combustion and Ventilation WARNING INSUFFICIENT COMBUSTION AIR SUPPLY MAY RESULT IN THE PRODUCTION AND RELEASE OF DEADLY CARBON MONOXIDE (CO) INTO THE HOME WHCH CAN CAUSE SEVERE PERSONAL INJURY OR DEATH. THIS BOILER IS NOT DESIGNED FOR USE IN A SPACE THAT IS DEPRESSURIZED RELATIVE TO THE OUTDOORS. OPERATING THIS BOILER IN A DEPRESSURIZED SPACE MAY CAUSE SEVERE PERSONAL INJURY OR DEATH. Sufficient fresh air must be supplied for combustion, ventilation, and flue gas dilution. Provisions for an adequate fresh air supply must be made in accordance with local codes, or in the absence of such codes, the National Fuel Gas Code (NFPA 54/ ANSI Z223.1). In Canada, refer to the Natural Gas and Propane Installation Code (CAN/CSA 149.1). The National Fuel Gas Code describes three basic ways to supply this boiler with adequate fresh air: Indoor Combustion Air Combustion air is drawn into the boiler room from other parts of the building and from the outdoors through natural infiltration (cracks under doors, etc). This method can not be used in all cases see discussion below. Outdoor Combustion Air Combustion air is brought directly into the boiler room from outdoors through ducts or grills sized and installed specifically for this purpose. Mechanical Combustion Air Supply Combustion air is brought into the room from outdoors using a blower system that is engineered specifically for this purpose. Each of the above methods is described in more detail in the following sections. The National Fuel Gas Code also describes some acceptable variations on these techniques that do not appear here. Using the Indoor Combustion Air Method 1) Total the input of all appliances in the boiler room in thousands of BTU/hr. 2) Find the volume of the boiler room in cubic feet: Volume (ft 3 ) = Length (ft) x Width (ft) x Height (ft) If the boiler room adjoins another room and there is no door present between these two rooms, add the volumes of the 6

9 rooms together. Repeat for any other connected rooms which do not have doors. Do not add the volume of two rooms separated by a door even if that door is always left open. 3) Divide the volume obtained in Step 2 by the input calculated in Step 1. 4) If the result is at least 50 ft 3 per 1000BTU/hr, and neither of the conditions described in (6) below are met, normal infiltration should provide adequate fresh air into the boiler room. 5) If the result is less than 50 ft 3 per 1000BTU/hr, provide two openings into the boiler room, one near the floor and one near the ceiling. The top edge of the upper opening must be within 12 of the ceiling and the bottom edge of the lower opening must be within 12 of the floor (Figure 5.1): Each opening must have a free area of 1 square inch per 1000 BTU/hr input of all gas burning appliances in the boiler room. The minimum opening dimension is 3 inches. Minimum opening free area is 100 square inches per opening. If the total volume of both the boiler room and the room to which the openings connect is less than 50 cubic feet per 1000 BTU/hr of total appliance input, install a pair of identical openings into a third room. Connect additional rooms with openings until the total volume of all rooms is at least 50 cubic feet per 1000 BTU/hr of input. The free area of an opening takes into account the blocking effect of mesh, grills, and louvers. Where screens are used, they must be no finer than ¼ (4 x 4) mesh. If providing openings into adjacent rooms is undesirable, use the Outdoor Combustion Air Method. 6) Do not use the Indoor Combustion Air Method described above if either of the following are true: a. The indoor space is so tightly constructed that the number of air changes per hour is known to be 0.4 or less. b. The boiler room is depressurized relative to the outdoors. This depressurization is possible if the structure is tightly constructed and/or is equipped with exhaust fans. Example: An AWR105EN and a water heater are to be installed in a room measuring 6 ft - 3 in x 7 ft with an 8 ft ceiling. The water heater has an input of BTU/hr: Total input in thousands of BTU/hr = ( BTU/hr BTU/hr) 1000 = 135 Volume of room = 6.25 ft x 7 ft x 8 ft = 350 ft 3 FIGURE 5.1: INDOOR COMBUSTION AIR METHOD 7

10 = Since 2.59 is less than 50, there will be an inadequate fresh air supply in the boiler room unless openings are installed between the boiler room and at least one adjacent room. It turns out that the boiler room in this example is adjacent to a full basement which is 20ft x 45ft x 8ft high. If two openings are installed into this basement that each have a free area of 135in 2, the combined volume of the boiler room and basement will be: 350ft ft 3 = 6750ft 3 and: = 50ft 3 per 1000 BTU/hr. In the absence of one of the conditions described in (6) above, this arrangement should provide an adequate fresh air supply to all the appliances in the boiler room. FIGURE 5.2: ALL AIR FROM OUTDOORS, VENTILATED CRAWL SPACE AND ATTIC FIGURE 5.3: ALL AIR FROM OUTDOORS, VIA VENTILATED ATTIC 8

11 FIGURE 5.4: OUTDOOR COMBUSTION AIR METHOD: USING OPENINGS INTO BOILER ROOM FIGURE 5.5: OUTDOOR COMBUSTION AIR METHOD: USING HORIZONTAL DUCTS INTO BOILER ROOM Using the Outdoor Combustion Air Method 1) Openings must be installed between the boiler room and the outdoors or a ventilated space, such as an attic or crawl space, which communicates directly with the outdoors. 2) Two openings are required. The top edge of the upper opening must be within 12 inches of the ceiling. The bottom edge of the lower opening must be within 12 inches of the floor. 3) Size openings and ducts as follows: Vertical ducts or openings directly outdoors (Figure 5.2, Figure 5.3, and Figure 5.4) Each opening must have a free cross sectional area of 1 square inch per 4000 BTU/hr of the total input of all gas-fired appliances in the boiler room. Minimum opening size is 3 inches. Openings to outdoors via horizontal ducts (Figure 5.5) Each opening must have a free cross sectional area of 1 square inch per 2000 BTU/hr of the total input of all gas fired appliances in the boiler room. Minimum opening size is 3 inches. The free area of an opening takes into account the blocking effect of mesh, grills, and louvers. Where screens are used, they must be no finer than ¼ (4 x 4) mesh. 9

12 If motorized louvers are installed in the openings to the outdoors, they must be interlocked to prevent operation of the fuel burning appliances in the boiler room unless the louvers are open. Mechanical Combustion Air Supply A mechanical system may be used to bring all combustion air to the boiler which meets all of the following requirements: 1) The system must be manufactured specifically for this purpose. 2) Size the system to deliver combustion air at the rate prescribed by the system manufacturer s instructions, but no less than 0.35 CFM for each 1000 BTU/hr of the combined input of all fuel burning appliances in the boiler room. If exhaust fans are present within the building, additional capacity may be required to prevent the boiler room from being depressurized. 3) The system must be interlocked to prevent operation of the fuel burning appliances in the boiler room if the system is not operating. VI Venting WARNING IMPROPER VENTING MAY RESULT IN PROPERTY DAMAGE AND/OR THE RELEASE OF FLUE GASES, WHICH CONTAIN DEADLY CARBON MONOXIDE (CO), INTO THE HOME, WHICH CAN CAUSE SEVERE PERSONAL INJURY OR DEATH. INSPECT EXISTING CHIMNEY BEFORE INSTALLING BOILER. FAILURE TO CLEAN OR REPLACE DAMAGED PIPE OR TILE LINING WILL CAUSE SEVERE INJURY OR DEATH. The vent system installation must be in accordance with local codes, or in the absence of such codes, the National Fuel Gas Code (NFPA 54/ANSI Z223.1). In Canada, refer to the Natural Gas and Propane Installation Code (CAN/CSA 149.1). A typical vent installation is illustrated by Figure 6.1. The components of vent installation are boiler draft diverter, vent damper, vent connector and chimney. The AWR series boilers are equipped with a draft hood which is built into the boiler; do not attempt to install an external draft hood. 1) Acceptable Chimneys - The following chimneys may be used to vent AWR series boilers: Listed Type B or L gas vent - Install in accordance with the manufacturer s instructions, the terms of its listing, and applicable codes. Masonry Chimney - The masonry chimney must be constructed in accordance with local codes, or in the absence of any, the Standard for Chimneys, Fireplaces, Vents, and Solid Fuel Burning Appliances (NFPA 211). The chimney must be lined with a clay liner or other listed lining system. Do not vent an AWR series boiler into an unlined chimney. 2) Acceptable Vent Connectors - The following may be used for vent connectors: Listed type B or L Gas Vent Single Wall Galvanized Pipe - Use (26 gauge or heavier). The size and location of the chimney may not permit the use of a single wall connector in some cases. (see the National Fuel Gas Code). Do not use single wall pipe for vent connectors in attics. Other Vent Connectors Permitted by the National Fuel Gas Code. 3) Chimney and Vent Connector Sizing - Size the chimney and vent connector in accordance with the National Fuel Gas Code. 10

13 4) Exterior Chimneys - An exterior chimney has one or more sides exposed to the outdoors below the roof line. The National Fuel Gas Code prescribes two conditions under which an exterior chimney may be used: In some very restrictive cases, the AWR series boilers may be vented into an exterior ceramic lined masonry chimney. See the National Fuel Gas Code for information on when exterior chimneys may be used. An exterior masonry chimney may be used if it is lined with B vent or a listed chimney lining system. FIGURE 6.1: TYPICAL VENT SYSTEM INSTALLATION AND COMPONENTS 5) This boiler may be vented using a listed power venter. The power venter must be in sized and installed in accordance with the power venter manufacturer s instructions, the terms of the power venter listing, and applicable codes. The boiler must be electrically interlocked with the power venter to prevent boiler operation if the power venter fails to operate. Before deciding to use a power venter, make certain that the flue gas exiting the power venter will not damage adjacent construction or other structures. Also make certain that the power venter terminal will not be subjected to winds which could affect power venter operation. 6) Do not connect the vent of this appliance into any portion of a mechanical vent system operating under positive pressure. 7) Do not connect the boiler into a chimney flue serving an open fireplace or other solid fuel appliance. 8) Prior to boiler installation, inspect chimney for obstructions or other defects and correct as required. Clean chimney as necessary. 9) Vent pipe should slope upward from draft diverter not less than one inch in four feet. No portion of vent pipe should run downward or have sags. Vent pipe must be securely supported. 10) The vertical section of vent pipe coming off the boiler should be as tall as possible, while still maintaining the proper clearance from the horizontal vent connector to combustibles and the proper pitch called for in (9) above. 11) Vent pipe should be installed above the bottom of the chimney to prevent blockage. 12) Vent pipe must be inserted flush with inside face of the chimney liner and the space between vent pipe and chimney sealed tight. 13) Do not install the vent damper in any portion of the vent system which is used by appliances other than the boiler being installed. 11

14 14) Vent damper installation is mandatory on all AWR series boilers. Install vent damper (see Figure 6.2) as follows: a) Open vent damper carton and remove installation instructions. Read the instructions thoroughly before proceeding. Verify that vent damper is same size as draft diverter outlet (Figure 2.1). Unpack vent damper carefully. Do not force closed damper blade. Forcing vent damper closed may result in damaged gear train and void warranty. b) Vent damper is factory shipped having approximately ¾ diameter hole in the vent damper blade, which must be plugged on all AWR boilers. Use the plug supplied with the damper. c) Mount the vent damper on the flue collar without modification to either and secure with sheet metal screws. Make sure screws do not interfere with damper blade operation. Vent damper blade position indicator must be visible to users. d) The damper wire harness is shipped pre-wired into the boiler. Plug the loose end of this harness into the damper and secure the flexible conduit to the damper using a connector nut provided. Provide adequate clearance to combustible construction and servicing. e) Install vent connector pipe and vent fittings from vent damper outlet to chimney or gas vent. Secure with sheet metal screws and support as required. FIGURE 6.2: VENT DAMPER INSTALLATION DETAILS Removing an Existing Boiler from a Common Chimney In some cases, when an existing boiler is removed from a common chimney, the common venting system may be too large for the remaining appliances. At the time of removal of an existing boiler the following steps shall be followed with each appliance remaining connected to the common venting system placed in operation, while the other appliances remaining connected to the common venting system are not in operation. a) Seal any unused opening in the common venting system. b) Visually inspect the venting system for proper size and horizontal pitch and determine there is no blockage or restriction, leakage, corrosion and other deficiencies which could cause an unsafe condition. c) Insofar as practical, close all building doors and windows and all doors between the space in which all the appliances remaining connected to the common venting system are located and other spaces of the building. Turn on clothes dryers and any appliance not connected to the common venting system. Turn on any exhaust fans, such as range hoods and bathroom exhausts, so they will operate at maximum speed. Do not operate a summer exhaust fan. Close fireplace dampers. d) Place in operation the appliance being inspected. Follow the lighting instructions. Adjust thermostat so the appliance will operate continuously. e) Test for spillage at the draft hood relief opening after five (5) minutes of main burner operation. Use the flame of a match or candle, or smoke from a cigarette, cigar, or pipe. 12

15 f) After it has been determined that each appliance remaining connected to the common venting system properly vents when tested as outlined above, return doors, windows, exhaust fans, fireplace dampers and any other gas-burning appliances to their previous condition of use. g) Any improper operation of the common venting system should be corrected so the installation conforms with the National Fuel Gas Code, ANSI Z When resizing any portion of the common venting system, the common venting system should be resized to approach the minimum size as determined using the appropriate tables in Part 10 of the National Fuel Gas Code, ANSI Z VII Gas Piping WARNING SHUT OFF GAS SUPPLY BEFORE SERVICING THE BOILER. ALL GAS PIPING MUST BE GAS TIGHT. USE GAS RATED THREAD COMPOUND ON ALL THREADED JOINTS TO AVOID LEAKS, WHICH MAY RESULT IN FIRE OR EXPLOSION. SIZE GAS PIPING, REGULATORS, VALVES AND METERS SO AS TO PROVIDE AN ADEQUATE GAS FLOW AND PRESSURE TO THE BOILER DURING OPERATION. FAILURE TO DO SO MAY CAUSE POOR COMBUSTION, NOISE, INJURY OR DEATH. Gas piping to the boiler must be sized to deliver adequate gas for the boiler to fire at the nameplate input at a line pressure between the minimum and maximum values shown on the rating plate. For more information on gas line sizing, consult the utility or the National Fuel Gas Code. Figure 7.1 shows typical gas piping connection to the AWR boiler. A sediment trap must be installed upstream of all gas controls. Install a manual shut-off valve outside the jacket and ground joint union as shown. The boiler and its gas connection must be leak tested before placing the boiler in operation. When doing this, the boiler and its individual shut-off must be disconnected from the rest of the system during any pressure testing of that system at pressures in excess of 1/2 psi. When pressure testing the gas system at pressures of 1/2 psi or less, isolate the boiler from the gas supply system by closing its individual manual shut-off valve. FIGURE 7.1: GAS CONNECTION TO BOILER 13

16 VIII System Piping WARNING INSTALL BOILER SO THAT THE GAS IGNITION SYSTEM COMPONENTS ARE PROTECTED FROM WATER (DRIPPING, SPRAYING, RAIN, ETC.) DURING APPLIANCE OPERATION AND SERVICE (CIRCULATOR REPLACEMENT, ETC.). OPERATION OF THIS BOILER WITH CONTINUOUS RETURN TEMPERATURES BELOW 120 F CAN CAUSE SEVERE HEAT EXCHANGER CORROSION DAMAGE. OPERATION OF THIS BOILER IN A SYSTEM HAVING SIGNIFICANT AMOUNTS OF DISSOLVED OXYGEN CAN CAUSE SEVERE HEAT EXCHANGER CORROSION DAMAGE. DO NOT USE TOXIC ADDITIVES, SUCH AS AUTOMOTIVE ANTIFREEZE, IN A HYDRONIC SYSTEM. PIPE RELIEF VALVE DISCHARGE TO A SAFE LOCATION. THE RELIEF VALVE MAY DISCHARGE SCALDING HOT WATER. DO NOT INSTALL A VALVE IN THE RELIEF VALVE DISCHARGE LINE. DO NOT MOVE RELIEF VALVE FROM FACTORY LOCATION. DO NOT PLUG RELIEF VALVE DISCHARGE. BLOCKING THE RELIEF VALVE MAY RESULT IN BOILER EXPLOSION. Standard Piping Figure 8.3 shows typical boiler system connections on a single zone system. Additional information on hydronic system design may be found in the I=B=R Guide RHH published by the Air-Conditioning, Heating and Refrigeration Institute (AHRI). The components in this system and their purposes are as follows: 1) Relief valve (Required) - Mount the relief valve on the left side of the boiler as shown in Figure 8.1 using the 1-1/4 x 4 nipple, 1-1/4 x 3/4 reducing elbow and 3/4 x close nipple provided. The relief valve shipped with the boiler is set to open at 30 psi. This valve may be replaced with one having a pressure up to the Maximum Allowable Working Pressure shown on the rating plate. If the valve is replaced, the replacement must have a relief capacity in excess of the DOE heating capacity for the boiler. Pipe the discharge of the relief valve to a location where water or steam will not create a hazard or cause property damage if the valve opens. The end of the discharge pipe must terminate in an unthreaded pipe. If the relief valve discharge is not piped to a drain it must terminate at least 6 inches above the floor. Do not run relief valve discharge piping through an area that is prone to freezing. The termination of the relief valve discharge piping must be in an area where it is not likely to become plugged by debris. If necessary, the relief valve may be installed in the supply piping as shown in Figure 8.2. When this is done, the relief valve must be as close to the boiler supply tapping as possible with no intervening shut-off valves. 2) Circulator (Required) - The circulator is shipped loose with the boiler. Fittings are provided to mount it on the boiler return as shown in Figure 8.3, however it can be installed on the boiler supply. If the circulator is moved to the supply it should be positioned just downstream of the expansion tank as shown in Figure ) Expansion Tank (Required) - If this boiler is replacing an existing boiler with no other changes in the system, the old expansion tank can generally be reused. If the expansion tank must be replaced, consult the expansion tank manufacturer s literature for proper sizing. 4) Fill Valve (Required) - Either a manual or automatic fill valve may be used. The ideal location for the fill is at the expansion tank. 14

17 FIGURE 8.1: STANDARD RELIEF VALVE POSITION FIGURE 8.2: ALTERNATE RELIEF VALVE POSITION FIGURE 8.3: STANDARD BOILER PIPING 5) Automatic Air Vent (Required) - At least one automatic air vent is required. Manual vents will usually be required in other parts of the system to remove air during initial fill. 6) Low Water Cut-Off (Required in some situations) - A low water cutoff (LWCO) is required when the boiler is installed above radiation. In addition, some codes such as ASME CSD-1 require low water cutoffs. Codes may also require that this low water cutoff have a manual reset function. The low water cutoff may be a float type or probe type, but must be designed for use in a hot-water system. The low water cutoff should be piped into the boiler supply just above the boiler with no intervening valves between it and the boiler. Crown LWCO kit PN is designed to be mounted in the boiler supply piping immediately adjacent to the boiler and to plug directly into the factory low voltage wiring. If using a field supplied LWCO, use a LWCO that breaks the 120VAC supply to the boiler. Do not attempt to wire a field-supplied 24VAC LWCO into the factory wiring. 15

18 7) Manual Reset High Limit (Required by some codes) - This control is required by ASME CSD-1 and some other codes. Install the high limit in the boiler supply piping just beyond the boiler with no intervening valves. Set the manual reset high limit as far above the operating limit setting as possible, but not over 240 F. Wire the control to break the 120 VAC electrical supply to the boiler. 8) Flow Control Valve (Required under some conditions) - The flow control valve prevents flow through the system unless the circulator is operating. A flow control valve may be necessary on converted gravity systems to prevent gravity circulation. Flow control valves are also used to prevent flow in circulator zone systems through zones that are not calling for heat. 9) Isolation Valves (Optional) - Isolation valves are useful if the boiler must be drained, as they will eliminate having to drain and refill the entire system. 10) Drain Valve - The drain valve is shipped in the boiler parts bag. Install it in the tee under the circulator as shown in Figure 11b. Piping for Special Situations Certain types of heating systems have additional requirements. Some of the more common variations follow: 1) Left Piped Boilers If necessary, the supply and return may be connected to the left side of the boiler by moving the 1-1/4 plug and the relief valve fittings from the tappings in the left side of the boiler to the corresponding tappings on the right. Both the supply and return connections must be made on the same side of the boiler. 2) Indirect Water Heaters - Figure 8.4 shows typical indirect water heater piping. Boiler piping is the same as for any twozone system. Figure 8.4 shows circulator zoning, which is usually preferred for indirect water heaters. Size the circulator and indirect water heater piping to obtain the boiler water flow through the indirect water heater called for by the indirect water heater manufacturer. 3) Large Water Volume Systems - The piping shown in Figure 8.5 will minimize the amount of time that the boiler operates with return temperatures below 120 F on these systems. A bypass is installed as shown to divert some supply water directly into the return water. The bypass pipe should be the same size as the supply. The two throttling valves shown are adjusted so that the return temperature rises above 120 F during the first few minutes of operation. A three-way valve can be substituted for the two throttling valves shown. If the circulator is mounted on the supply, the bypass must be on the discharge side of the circulator. FIGURE 8.4: INDIRECT WATER HEATER BOILER SIDE PIPING 16

19 FIGURE 8.5: BOILER BYPASS PIPING FIGURE 8.6: ISOLATION OF BOILER FROM SYSTEM WITH A HEAT EXCHANGER 17

20 4) Low Temperature Systems - Some systems, such as radiant tubing systems, require the system water temperature to be limited to a value below the temperature of the water leaving the AWR. These systems also typically have return temperatures well below the 120 F minimum. Figure 14 illustrates the use of a heat exchanger to connect the AWR boiler to this type of system. The heat exchanger will permit the transfer of heat from the boiler water to the low temperature system while holding the system supply and boiler return temperatures within their limits. For this system to work properly the heat exchanger must be properly sized and the correct flow rates are required on either side of the heat exchanger. Consult the heat exchanger manufacturer for sizing information. The water in the boiler is completely isolated from the water in the system. This means that separate fill and expansion tanks are required for the heating system loop. There are several other ways to connect low temperature systems to the non-condensing boilers like the AWR such as four way mixing valve and variable speed injection Circulatoring systems. 5) Systems containing oxygen - Many hydronic systems contain enough dissolved oxygen to cause severe corrosion damage to a cast iron boiler such as the AWR. Some examples include: Radiant systems that employ tubing without an oxygen barrier. Systems with routine additions of fresh water. Systems which are open to the atmosphere. If the boiler is to be used in such a system, it must be separated from the oxygenated water being heated with a heat exchanger as shown in Figure 8.6. Consult the heat exchanger manufacturer for proper heat exchanger sizing as well as flow and temperature requirements. All components on the oxygenated side of the heat exchanger, such as the Circulator and expansion tank, must be designed for use in oxygenated water. 6) Piping with a Chiller - If the boiler is used in conjunction with a chiller, pipe the boiler and chiller in parallel as shown in Figure 8.7. Use isolation valves to prevent chilled water from entering the boiler. 7) Air Handlers - Where the boiler is connected to air handlers through which refrigerated air passes, use flow control valves in the boiler piping or other automatic means to prevent gravity circulation during the cooling cycle. FIGURE 8.7: BOILER PIPING WITH CHILLER 18

21 IX Wiring WARNING ALL WIRING AND GROUNDING MUST BE DONE IN ACCORDANCE WITH THE AUTHORITY HAVING JURISDICTION OR, IN THE ABSENCE OF SUCH REQUIREMENTS, WITH THE NATIONAL ELECTRICAL CODE (ANSI/NFPA 70). DISCONNECT ELECTRICAL POWER TO THE BOILER AND HEATING SYSTEM BEFORE SERVICING. POSITIVELY ASSURE THAT NO VOLTAGE IS PRESENT. LOCK ELECTRICAL BOXES TO PREVENT SOMEONE FROM INADVERTENTLY RESTORING POWER BEFORE THE HEATING SYSTEM IS SAFE TO OPERATE. NEVER DEFEAT OR JUMP OUT SAFETY DEVICES. PROTECT EACH BOILER CIRCUIT WITH A PROPERLY SIZED OVER-CURRENT PROTECTION DEVICE. MAKE ELECTRICAL CONNECTIONS CAREFULLY ACCORDING TO THE BOILER S WIRING DIAGRAM AND INSTRUCTIONS. WIRE ADDITIONAL FIELD SUPPLIED SAFETY LIMITS, SUCH AS LOW WATER CUTOFFS AND TEMPERATURE LIMIT DEVICES, IN SERIES WITH THE 120V CIRCUIT USED TO POWER THE BOILER. DO NOT ALTER THE BOILER S FACTORY WIRING WHEN ADDING AN ADDITIONAL LIMIT DEVICE. 1) Line Voltage (120 VAC) Field Connections See Figure 9.0 for line voltage connections. Provide a dedicated circuit for the boiler of 15A or greater. A service switch is recommended and is required by many local codes. Locate this switch in accordance with local codes or, in the absence of any, in a location where it can be safely accessed in an emergency involving the boiler. All 120VAC connections to the boiler itself are made inside the junction box on the right side of the boiler (accessible through the cover plate on the right side jacket panel). 120VAC connections are: Ground 120VAC Hot (Black) 120VAC Neutral (White) Heating Circulator Hot (Red) Heating Circulator Neutral (White) DHW Circulator Hot (Blue) DHW Circulator Neutral (White) The use of the Circulator outputs are as follows (also refer to the Piping Section) a) Heating Circulator - Pumps water upon a call for heat (CH) from the thermostat terminals T-T shown in Figure 9.1 or from an EnviraCom thermostat. This output is factory wired to the circulator whip mounted on the boiler. b) DHW Circulator - Pumps boiler water to an indirect water heater upon a call for doemstic hor water (DHW) from the DHW thermostat terminals shown in Figure 9.1. This output can also be used for a second space heating zone. See Section XI of this manual for additonal information. Maximum circulator current draw is 5.0 FLA. 19

22 2. Low Voltage Connections Low voltage field connections are located as shown in Figure 9.1 and are as follows: a) Heating Thermostat - Connect to a 24 volt thermostat or other dry contacts (such as a zone panel end switch) that close upon a call for heat. Follow thermostat manufacturer s instructions. To insure proper thermostat operation, avoid installation in areas of poor air circulation, hot spots (near any heat source or in direct sunlight), cold spots (outside walls, walls adjacent to unheated areas, locations subject to drafts). Provide Class II circuit between thermostat (or zone controls) and boiler. b) DHW - If used, connect to a 24VAC domestic hot water thermostat or 2nd space heating thermostat. c) Option Plug #1 - Used to connect either of the following: Crown # optional LWCO kit Crown Option Card Panel kit (See instructions provided with this kit for additional details). Note: When Option Plug #1 is not used, the factory supplied jumper plug shown in Figure 9.1 must be installed for boiler to operate. d) Option Plug #2 - Used to connect Crown optional touch screen display or service tool (see instructions provided with these options for addional details). e) EnviraCOM - Used to connect EnviraCom themrostat or other EnviraCom device approved by Crown for use with this boiler. CAUTION When making low voltage connections, make sure that no external power source is present in the thermostat circuits. If such a power source is present, it could destroy the boiler s control. One example of an external power source that could be inadvertently connected to the low voltage connections is a transformer in old thermostat wiring. Do not attempt to use EnviraCOM connections for any purpose not explicitly permitted by Crown Boiler Company. Attempting to do so may result in unreliable operation and/or damage to controls. Do not use the transformer provided on the boiler to power external devices such as zone valves. Doing so may cause damage to the transformer. 20

23 FIGURE 9.0: LINE VOLTAGE FIELD CONNECTIONS FIGURE 9.1: LOW VOLTAGE FIELD CONNECTIONS 21

24 FIGURE 9.2: INTERNAL CONNECTIONS DIAGRAM 22

25 FIGURE 9.3: LADDER DIAGRAM 23

26 X Start-up and Checkout WARNING DO NOT LEAVE THE BOILER IN SERVICE IF IT FAILS ANY OF THE FOLLOWING START-UP CHECKS. DOING SO MAY RESULT IN FIRE, EXPLOSION, OR CARBON MONOXOIDE (CO) POISONING. WARNING GAS LEAKS MAY RESULT IN FIRE OR EXPLOSION. NEVER USE A FLAME TO CHECK FOR GAS LEAKS. MAKE SURE THAT THE AREA AROUND THE BOILER IS CLEAR AND FREE FROM COMBUSTIBLE MATERIALS, GASOLINE AND OTHER FLAMMABLE VAPORS AND LIQUIDS. WATER LEAKS MAY CAUSE EXTENSIVE PROPERTY DAMAGE. NOTE SAFE LIGHTING AND OTHER PERFORMANCE CRITERIA WERE MET WITH THE GAS MANIFOLD AND CONTROL ASSEMBLY PROVIDED ON THE BOILER WHEN THE BOILER UNDERWENT THE TESTS SPECIFIED IN Z Use the following procedure for initial start-up of the boiler: 1) Make sure that the boiler and system are filled with water. 2) Check all gas piping for leaks and purge piping sections that are filled with air. See of the National Fuel Gas Code for additional information on testing and purging gas lines. 3) Verify that vent system is complete and free of obstructions before attempting to fire boiler. 4) Inspect all wiring for loose or uninsulated connections. 5) Make sure the main burners are seated properly in the rear of burner tray and on orifices. 6) Adjust thermostat to the highest setting. 7) Start the boiler using the operating instructions on page 25. The red LED display on boiler control should illuminate as soon as power is applied to the boiler, but it will take approximetly 1 minute from the time power is applied to the boiler, and the thermostat is closed, until the first trial for ignition. For additional information on boiler operation, see Section XI. 8) Upon initial start-up, the gas train will be filled with air. Even if the gas line has been completely purged of air, it may take several tries for ignition before a flame is established. Once a flame has been established for the first time, subsequent calls for burner operation should result in a flame on the first try. 9) Inspect the pilot burner flame. The pilot burner produces three flames. The center one should be a steady medium blue flame covering around 3/8 to 1/2 of spark electrode/flame rod. (Figure 10.1) 10) Make sure vent damper is in open position when main burners are firing. 11) Inspect the main burner flames visible through the observation port in burner access panel. The flame should be stable and mostly blue (see Figure 10.2). No yellow tipping should be present; however, intermittent flecks of yellow and orange in the flame are normal. 12) Check entire gas train for leaks using soap and water or other approved leak detection method while boiler is firing. Fix any leaks found immediately. 24

27 FOR YOUR SAFETY READ BEFORE LIGHTING WARNING: If you do not follow these instructions exactly, a fire or explosion may result causing property damage, personal injury or loss of life. A. This appliance is equipped with an ignition device which automatically lights the pilot. Do not try to light the pilot by hand. B. BEFORE LIGHTING smell all around the appliance area for gas. Be sure to smell next to the floor because some gas is heavier than air and will settle on the floor. WHAT TO DO IF YOU SMELL GAS Do not try to light any appliance. Do not touch any electric switch; do not use any phone in your building. Immediately call your gas supplier from a neighbor s phone. Follow the gas supplier s instructions. If you cannot reach your gas supplier, call the fire department. C. Use only your hand to push in or turn the gas control knob. Never use tools. If the knob will not push in or turn by hand, don t try to repair it, call a qualified service technician. Force or attempted repair may result in a fire or explosion. D. Do not use this appliance if any part has been under water. Immediately call a qualified service technician to inspect the appliance and to replace any part of the control system and any gas control which has been under water. OPERATING INSTRUCTIONS 1. STOP! Read the safety information above on this label. 2. Set the thermostat to lowest setting. 3. Turn off all electric power to the appliance. 4. This appliance is equipped with an ignition device which automatically lights the pilot. Do not try to light the pilot by hand. GAS CONTROL KNOB (SHOWN IN ON POSITION) 5. Remove front access panel. 6. Rotate the gas control knob clockwise to OFF. 7. Wait five (5) minutes to clear out any gas. Then smell for gas, including near the floor. If you then smell gas, STOP! Follow B in the safety information above on this label. If you don t smell gas go to the next step. 8. Rotate the gas control knob counter clockwise to ON. GAS OUTLET GAS INLET 9. Replace front access panel. 10. Turn on all electric power to the appliance. 11. Set thermostat to desired setting. GAS VALVE - TOP VIEW 12. If the appliance will not operate, follow the instructions To Turn Off Gas To Appliance and call your service technician or gas supplier. TO TURN OFF GAS TO APPLIANCE 1. Set the thermostat to lowest setting. 2. Turn off all electric power to the appliance if service is to be performed. 3. Push in gas control knob slightly and turn clockwise to OFF. Do not Force. 25

28 13) Run gas valve safety shutdown test. With main burners firing, disconnect ignition cable from ignition module. Both pilot burner and main burners should stop firing. 14) Check the manifold pressure and adjust if necessary. To do this, use the following procedure: a) Connect a manometer to the inlet pressure tap on the gas valve (see Figure 10.3). b) Check the line pressure with all gas appliances on and off. The line pressure at the boiler must be within the following limits regardless of what combination of appliances is firing: Line Press (inches w.c.) Natural Gas LP Gas Min Max If the line pressure falls outside of these limits, find and correct the cause of the problem before proceeding further. c) Connect a manometer to the manifold (outlet) pressure tap on the gas valve (see Figure 10.3). d) Read the manifold pressure. It should be set at 3.5 in w.c. for natural gas and 10.0 in w.c. for LP e) If a manifold pressure adjustment is needed, make the adjustment by turning the regulator (see Figure 10.3) screw clockwise to raise the pressure and counter clockwise to reduce the pressure. If a manifold pressure adjustment is made, recheck the line pressure to be certain that it is still within acceptable limits. Replace the cover screw on the regulator. 15) Test thermostat operation while the boiler is running. Turn the thermostat to the lowest setting. Circulator should stop running and both pilot burner and main burners should stop firing. Raise the thermostat back to the highest setting. Circulator should restart. The pilot burner and main burners should relight. 16) Verify high limit operation. Allow the boiler water temperature to increase to high limit setting (factory set to 180F). Circulator should continue running. Both pilot burner and main burners should stop firing when the gauge reading is within 15F of the high limit setting. 17) Allow the boiler water temperature to drop below high limit setting. The pilot burner and main burners should relight. 18) After the boiler has operated for approximately 30 minutes, check the boiler and heating system piping for leaks. Repair any leaks found at once. 19) Inspect the vent system for flue gas leaks and for proper operation. To do this: a) Insofar as practical, close all building doors and windows and all doors between the space in which all the boiler is located and other spaces of the building. Turn on clothes dryers and any other appliance not connected to the same vent system as the boiler. Turn on any exhaust fans, such as range hoods and bathroom exhausts, so they will operate at maximum speed. Close fireplace dampers. b) Place in operation the appliance being inspected. Follow the lighting instructions. Adjust thermostat so the appliance will operate continuously. c) Test for spillage at the draft hood relief opening after five (5) minutes of main burner operation. Use the flame of a match or candle, or smoke from a cigarette, cigar,, pipe, etc. d) Repeat (c) for any other appliances connnected to the same vent system as the boiler. No spillage should be present with any combination of appliances in operation. e) After it has been determined that the vent system operates properly when tested as outlined above, return doors, windows, exhaust fans, fireplace dampers and any other gas-burning appliances to their previous condition of use. f) Any improper operation of the common venting system should be corrected so the installation conforms with the National Fuel Gas Code, ANSI Z When resizing any portion of the common venting system, the common venting system should be resized to approach the minimum size as determined using the appropriate tables in Part 10 of the National Fuel Gas Code, ANSI Z ) Use a combustion anlayzer to confirm normal combustion performance. To do this, insert the probe of the combustion analyzer through the draft hood opening and into the area above the block. Slowly wave the probe around in this area to obtain an average sample of the flue products upstream of the draft diverter. Readings obtained should be as shown in Table ) Verify proper operation of any field installed safety devices, such as low water cut-offs. 26

29 FIGURE 10.1: PILOT BURNER FLAME FIGURE 10.2: MAIN BURNER FLAME FIGURE 10.3: GAS VALVE DETAIL Fuel Max. CO 2 (%) Min O 2 (%) Max CO (PPM) Natural Gas PPM Propane PPM TABLE 10.4: FLUE GAS COMBUSTION READING 27

30 XI Operation A. General Information This boiler uses a proprietary version of the Honeywell S9361A integrated boiler control to manage all boiler functions including flame supervision, temperature control, and Circulator operation. This control can operate one or two circulator zones without the use of additional relays. Crown offers several control options that plug into Option Plugs 1 and 2. These include a touch screen display, low water cut-off kits, and an outdoor reset control. Specific information on these options, along with installation and operating instructions, are available through Crown distributors and at In accordance with the 2007 Energy and Independence Security Act, this control first attempts to use residual heat in the boiler to satisfy a space heating demand before firing the burner. In this manual, this function is referred to as a thermal purge. For additional information see Part C of this section. B. Reading Status and Using Menu The boiler s status, as well as all parameters, are viewed and adjusted using the 3 digit LED and three buttons shown in Figure The S9361A has four basic modes of operation (also see Figure 11.1): 1) Status Mode - This is the default mode of operation for the control. In it, the display alternates between StA and a number indicating the current status of the boiler. A list and description of these status numbers is shown in Table 11.2 and is also shown on the face of the control itself. 2) Operating Mode - Provides additional information about the current status of the boiler. Operating mode is entered by pressing the I button shown in Figure When this button is first pressed in Status mode, the display will alternately display bt and the current boiler water temperature as shown in Figure Pressing the I button again will display the next line item shown in Table In the same manner it is possible to advance through all of the parameters shown in Table To return to Status mode, press I repeatedly until StA once again appears on the display. Alternatively, the control will return to Status mode if no key is touched for 30 minutes. 3) Error Mode - In Error mode, the control alternately displays Err and an error code. A list of these error codes is found on the front of the control, as well as in Section XIII of this manual (along with suggested corrective actions). 4) Adjustment Mode - Used to change parameters, such as high limit setting. See Part C for using Adjustment Mode. FIGURE 11.0 LOCATION/APPEARANCE OF LED, BUTTONS 28

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