APPLICATION GUIDE HOT WATER/GAS

HOT WATER/GAS APPLICATION GUIDE Guidelines for the design, purchase and installation of Slant/Fin Caravan gas-fired, hot water modular boiler systems. CONTENTS Introduction................................... Ratings and dimensions........................, Optional factory supply and return headers........... oiler room design............................. oiler room air supply requirements................ Typical layouts for gas-fired systems................7 Venting a gas-fired system......................8,9 Gas piping.................................9- Controls.................................., Field Wiring at Modules......................... Reset Ratio and Temperature Set Points............ Control Wiring Diagrams*: SCG00, space heating only................,7 SCG00, space heating and domestic hot water.8,9 SCG00, space heating only...............0, SCG00, space heating and domestic hot water, SCG000, space heating only..............., SCG000, space heating and domestic hot water,7 * All wiring diagrams are based on continuous circulation. CODES AND STANDARDS All Caravan installations must comply to local codes or, in the absence of local codes, to the National Fuel Gas Code, ANSI, Z.-latest edition. In addition where required by the authority having jurisdiction, the installation must conform to American Society of Mechanical Engineers Safety Codes for controls and safety devices for automatically fired boilers, No. CSD-. The installation must also conform to the additional requirements of Slant/Fin Instruction ook publication no. GG-00-0 latest edition. All electrical wiring is to be done in accordance with the National Electrical Code ANSI/NFPA No. 70-latest edition and all local electrical codes. The unit must be electrically grounded if an external power source is used. In Canada, the installation must be in accordance with standards CGA 9. and 9., installation codes for gas burning appliances and equipment and/or local codes. All electrical connections are to be made in accordance with Standard C.S.A. C. Canadian Electrical Code Part and/or local codes. Many state and local codes require intermittent ignition devices for gas boilers. Please specify if necessary. INTRODUCTION OF FRESH WATER Introduction of excessive amounts of fresh water into a system can cause scaling and leave deposits in the boiler and the surrounding pipes. This will lead to inefficient boiler operation and breakdown. Fresh water will enter the system as a result of hidden leaks such as may occur in underground piping. Relief valves should be piped to a location that shows visible signs of relief. Process applications that use fresh water, require the use of heat exchangers. Any process application that results in introduction of fresh water into a boiler can cause scaling with deposits forming in the boiler and surrounding piping. This will damage the boiler. Introduction of fresh water from leaks will cause similar damage. In some areas it may be necessary to use a feed water treatment to control the corrosive makeup of the feed water. Check with the local authority, to determine if the feed water will need a conditioning treatment before being supplied to the boiler. This Caravan application manual is intended to simplify the selection and application of Slant/Fin modular systems for a variety of space heating and domestic hot water requirements. It applies to gas-fired, hot water applications only. Where intermittent pilot, vent damper or any additional information is required, contact your local wholesaler, Slant/Fin sales representative, or the Slant/Fin factory. Due to design flexibility of a Caravan modular boiler system, TU input capacities are unlimited. A. oiler room design, size and flexibility - since Caravan modules have the burner and controls mounted to the front, they can be installed with minimum clearances as INTRODUCTION per codes, thus saving a significant amount of floor space.. Faster, easier installation - modules are completely factory assembled, including individual jackets to save onsite labor. Optional easy to install return and supply headers with flexible quick connect fittings are available for hot water systems. C. Safety - each module contains an individual high limit control and a dual combination gas valve. ASME relief valve is provided separately for mounting directly on each module. D. Fast domestic hot water recovery - Caravan offers an external heat exchanger of the positive circulating type. Publication No. CG-0-HWG Printed in the U.S.A. 898

Table : Gas Caravan ratings and dimension/hot water model GGT Series (00 PSI maximum working pressure) Model No. No.of Htg. Mod. Consists of Module Model Number I==R Ratings (MH) Input Gross Output EDR Water (Sq.Ft.) I==R Net Output oiler Horsepower Water Content (gal.) GGT-00E GG-00EC 00 8 80 9.9. 80 9 7 7 8 '" " GGT-00E GG-0EC 00 0 0.0. 90 9 8 8 0 8 7 8 '8" " GGT-00E GG-00EC 00 80 780 7. 8. 080 9 8 8 '" " GGHT-700E GG-0HEC 700 8 8 0 7. 0. 0 0 7 8 9 '" " GGHT-70E GG-7HEC 70 08 0 9 8. 0. 0 0 9 8 0 '" " GGHT-800E GG-99HEC 798 78 9 9. 0. 0 0 8 0 '" " GGT-900E GG-00EC 900 70 7. 7. 90 9 8 8 7'7" " GGHT-00E GG-0HEC 00 87 0 78 0.9 80 0 7 8 9 7'0" " GGHT-E GG-7HEC 9 8 79 7. 0.9 80 0 9 8 0 7'0" " GGHT-00E GG-99HEC 97 98 8 8 9. 0.9 80 0 8 0 7'0" " GGT-00E GG-00EC 00 90 0 8 8.7.8 0 9 8 8 0'" " GGHT-00E GG-0HEC 00 7 00.7. 0 0 7 8 9 0'" " GGHT-00E GG-7HEC 00 70 07.. 0 0 9 8 0 0'" " GGT-00E GG-00EC 00 00 90 0.9.0 7 9 8 8 '" " GGHT-00E GG-99HEC 9 08 780 7 9.0. 0 0 8 0 0'" " GGHT-70E GG-0HEC 70 80.. 00 0 7 8 9 '" " GGHT-87E GG-7HEC 87 0 880.. 00 0 9 8 0 '" " GGHT-000E GG-99HEC 99 97 8.8. 00 0 8 0 '" " GGHT-00E GG-0HEC 00 7 00.8 0 0 7 8 9 '0" " GGHT-0E GG-7HEC 0 8 07 8..8 0 0 9 8 0 '0" " GGHT-00E GG-99HEC 9 9 7 70 8..8 0 0 8 0 '0" " GGHT-0E 7 GG-0HEC 0 0 788 78 0.7 7. 70 0 7 8 9 '0" " GGHT-E 7 GG-7HEC 8 80. 7. 70 0 9 8 0 8'" " GGHT-800E 7 GG-99HEC 79 89 990 8. 7. 70 0 8 0 8'" " GGHT-800E 8 GG-0HEC 800 7 0 9. 8. 880 0 7 8 9 '" " GGHT-000E 8 GG-7HEC 000 09 7. 8. 880 0 9 8 0 '" " GGHT-0E 9 GG-0HEC 0 7 7 78. 8. 90 0 7 8 9 '0" " GGHT-00E 8 GG-99HEC 9 0 7 78. 8. 880 0 8 0 '" " GGHT-7E 9 GG-7HEC 7 7 80 79 8.7 9.7 90 0 9 8 0 '0" " GGHT-00E 0 GG-0HEC 00 90 8 8.7 9.7 00 0 7 8 9 '" " GGHT-00E 9 GG-99HEC 9 9 700 9 87.9 9.7 90 0 8 0 '0" " GGHT-70E 0 GG-7HEC 70 00 70 90.8 0.0 00 0 9 8 0 '" " GGHT-000E 0 GG-99HEC 990 70 89 8 97. 0.0 00 0 8 0 '" " Ship Wt. Jkt. Width A Draft Hood Ht. Flue Collar C Draft Hood Ht. D Header to Header E Space twn. Mods. F Length with Header L Min. Header Size FOR LARGER SIZES, USE MULTIPLES OF THE AOVE. * Specify gas by name, "Natural" or "Propane". Net ratings are based on piping and pick-up allowance of.. Slant/Fin should be consulted before selecting a boiler for installation having unusual piping and/or pick-up requirements. Ratings must be reduced by % at,000 ft. elevation and an additional % for every additional,000 ft. elevation over,000 ft. Net ratings in square feet based on emission rate of 0 tuh/sq. ft. Refer to figures and 8. Headers shown are optional. All factory supplied headers use " system connections. Modules in excess of 0 should be piped in parallel in two or more batteries. Note: For higher capacities, specify correct combination of standard Caravan modules shown.

Figure : Gas Caravan dimensions and typical piping/hot water models Design Data Max. ASME Working Pressure: 00 PSI Power Requirements: 0 volts, 0 HZ,. amps per module

Figure. Recommended boiler piping for variable circulation Figure. Supply and return piping locations Figure. Instantaneous tankless coil two temperature with recirculation Figure. Storage tank from tankless coil with recirculation

EQUIPMENT INCLUDED GGT SERIES Hot Water Models One per module unless otherwise noted Pre-assembled heat exchangers with built-in air separators and insulated jacket. ase. Flue collector. Gas burners, gas orifices and manifold assembly. Combination gas valve including manual shut-off pressure regulator. Pilot adjustment and automatic pilot-thermocouple safety. Hi-limit control. System pressure and temperature gauge (unmounted, one per system). Module pressure and temperature gauge (unmounted). Module pressure relief valve (ASME) (unmounted). Specify 0, 0 or 00 PSI. Control header (unmounted, one per system). Draft hoods (unmounted). OPTIONAL EQUIPMENT Hot water supply and return header assemblies. Control panel with automatic lead lag. Spark ignition system. Vent dampers. External DHW heat exchanger. Figure. Gas Caravan optional header assembly for all models GGT hot water Caravan systems *uilding piping must be rigidly secured so it cannot move where connected to headers. NOTE: Shown reverse return (Preferred). For direct return, header assembly piping connections may be made at the same end of the boiler bank, not as shown. Same governing agencies do not allow compression type couplings. Consult your local code requirements.

OILER ROOM DESIGN Caravan modular boiler systems allow better utilization of floor space and permit future expansion with minimum cost. Caravan modules are hand truckable, fit through doorways and often may be installed around an existing inoperative boiler. They can be grouped in heating module batteries of single, multiple or angular rows. Gas-fired boiler systems consisting of or more modules should be piped in parallel in two or more batteries. Illustrated on the following page are typical boiler room layouts and dimensional data on the size requirements of gas-fired hot water boilers. OILER ROOM AIR SUPPLY To ensure safe, efficient operation, the modular boiler system must be supplied with sufficient air to support complete combustion, replacing air entering draft dampers or draft hoods and ventilating the boiler room or areas. For additional information, not listed below, see ANSI, Z., section... INSTALLATION IN ENCLOSED OILER ROOM REQUIRES TWO UNOSTRUCTED OPENINGS FOR PASSAGE OF AIR INTO THE OILER ROOM:. Air drawn horizontally from outdoors DIRECTLY through an outside wall; one louvered opening near the floor (below burner air inlet) and one louvered open ing near the ceiling (above the highest draft regulator), each opening with a minimum FREE air passage area of square inch per 000 TUH of total system input.. Air drawn horizontally through HORIZONTAL DUCTS; one opening near the floor (below burner inlet) and one opening near the ceiling (above the highest draft regulator), each opening with a minimum FREE air passage area of square inch per 000 TUH of total system input.. Air drawn VERTICALLY from outdoors; one opening at the floor and one opening at the ceiling, each opening with a minimum FREE air passage area of square inch per 000 TUH of total system input. Figure 7: Correct location of combustion-air supply ducts. Air drawn from inside the building; one opening near the floor (below burner inlet) and one opening near the ceiling (above the highest draft regulator), each opening with a minimum FREE air passage area of square inch per 000 TUH of total system input. IF OILERS ARE INSTALLED ADJACENT TO OTHER FUEL URNING EQUIPMENT, THE AREA OF FREE OPENINGS MUST E APPROPRIATELY INCREASED TO ACCOMMODATE THE LOAD. UNLESS PROPERLY CONTROLLED, AVOID THE USE OF FORCED VENTILATION, SINCE IT CAN CREATE AN UNDESIRALE PRESSURE DIFFERENTIAL ETWEEN OILER ROOM AND AIR SOURCE.

Figure 8. Typical layouts for gas-fired systems 7

VENTING A GAS-FIRED SYSTEM A boiler venting system provides an escape path for the products of combustion. There are three major components for venting a gas-fired Caravan: a draft hood for each module, a breeching manifold and a chimney. Draft Hood The draft hood is part of each boiler module, although shipped in a separate carton. It compensates for excessive draft that can be caused by the venturi effect of winds passing over the top of the chimney. The dimensional relationships between the draft hood, the boiler and surface on which the boiler is mounted, are critical. These factors are all interdependent in allowing the draft hood to function without moving parts. Attempts to alter these dimensions can result in unsafe operating conditions. Note: When mounting the modules on a raised platform, be certain the platform extends past the edge of the modules at least inches on all sides. reeching reeching is a term used to describe a manifold(s) that connects individual boiler modules to a chimney. reeching is usually constructed of sheet metal having a smooth interior surface with all joints made tight against leakage. Pitch breeching up toward chimney. Horizontal breeching size should be maintained for the total length. Any transitions should be made after modules. Connection should be made at a angle in the direction of the chimney. See figure 0. Table. Model No. reeching dimensions for gas-fired systems GGT and GGHT series: hot water boilers. No. of Modules Consists of Module No. 0 Feet Chimney Height* Feet 0 Feet 0 Feet GGT-00E GG-00EC 9" 9" 8" 8" GGT-00E GG-0EC 0" 9" 9" 8" GGT-00E GG-00EC " 0" 0" 9" GGHT-700E GG-0HEC " " 0" 0" GGHT-70E GG-7HEC " " " 0" GGHT-800E GG-99HEC " " " 0" GGT-900E GG-00EC " " " " GGHT-00E GG-0HEC " " " " GGHT-E GG-7HEC " " " " GGHT-00E GG-99HEC " " " " GGT-00E GG-00EC " " " " GGHT-00E GG-0HEC " " " " GGHT-00E GG-7HEC " " " " GGT-00E GG-00EC " " " " GGHT-00E GG-99HEC 8" " " " GGHT-70E GG-0HEC 8" 8" " " GGHT-87E GG-7HEC 8" 8" 8" " GGHT-000E GG-99HEC 0" 8" 8" " GGHT-00E GG-0HEC 0" 8" 8" GGHT-0E GG-7HEC 0" 0" 8" " GGHT-00E GG-99HEC 0" 0" 0" 8" GGHT-0E 7 GG-0HEC 0" 0" 0" 8" GGHT-E 7 GG-7HEC " 0" 0" 8" GGHT-800E 7 GG-99HEC " " 0" 8" GGHT-800E 8 GG-0HEC " 0 8 GGHT-000E 8 GG-7HEC " " " 0" GGHT-0E 9 GG-0HEC " " " 0" GGHT-00E 8 GG-99HEC " " " 0" GGHT-7E 9 GG-7HEC " " " 0" GGHT-00E 0 GG-0HEC " " 0" GGHT-00E 9 GG-99HEC " " " 0" GGHT-70E 0 GG-7HEC " " " " GGHT-000E 0 GG-99HEC " " " " ased on single row of modules with no elbows. * Height measured from top of draft hood to top of chimney. NOTE: For conditions other than those shown, consult factory, or National Fuel Gas Code NFPA Run breeching as high as clearance permits to obtain maximum vertical rise of individual boiler vents. Note that this does not alter chimney height (the height from hood skirt to chimney top). The portion of chimney height rising directly above each hood is most effective in preventing spillage. When the boiler room is in unheated space, insulate vent pipe and breeching to maintain flue gas temperature and good chimney operation. It is not permitted to lower draft hood skirt height to achieve pitch, or to compensate for low ceilings. For some combinations of low chimneys, ceilings and long breeching, a draft inducer may be needed. Inducers when required are locally specified and warrantied. The breeching should extend into, but not beyond, the chimney liner. Chimney Caravan gas-fired modular boilers operate efficiently with masonry or prefabricated chimneys as well as with Type or double-walled metal vent pipe. This latter type of chimney construction is generally the least expensive. Chimney height is usually governed by the building height and the size of the boilers (see Table ). However, the chimney should be high enough to minimize the effects of turbulent winds and pressure common near roof-top obstruction. A vent cap should be used where permitted for additional protection against adverse wind conditions and precipitation. The National oard of Fire Underwriters recommend that the chimney should extend at least feet above the roof and be feet higher than any obstruction within 0 feet. Sizing Horizontal reeching Connectors and Chimneys for Gas-Fired Systems Horizontal breeching connectors shall be constant sized. The chimney and the horizontal breeching connector are sized using Table. When there are multiple banks of boilers, the horizontal breeching connector for each bank is sized using Table. To size the common horizontal breeching connector, add up the total input and refer to Table to size. The minimum chimney opening will be equal to the size of the largest horizontal breeching section connected to it. Horizontal reeching Connector Length The MAXIMUM length of the horizontal breeching connector length between the chimney and the closest boiler shall NOT be longer than inches per inch of horizontal breeching connector diameter, i.e. if the horizontal breeching connector is " D., the MAXIMUM length from the chimney to the first boiler would be " x " or 9 inches. The MINIMUM length shall be inches regardless of the horizontal breeching connector diameter. See figure 9. Vent Connector Diameters (0' chimney*) Model Flue Outlet Size Connector ' High ' High ' High GG-00C 7" 7" 7" 8" GG-0C 8" 8" 8" 0" GG-00C 8" 8" 0" 0" GG-0H 9" 9" 0" " GG-7-HC 0" 0" 0" " GG-99HC 0" 0" " " ased on single row of modules with no elbows. NOTE: For conditions other than those shown, consult factory, or National Fuel Gas Code NFPA 8

GAS PIPING This section contains sizing and construction recommendations for fuel supply piping to Caravan gas-fired modular boiler systems. Gas-fired equipment must conform not only to codes of local regulatory agencies, but also to additional specifications that may be imposed by the utility or gas supplier. Therefore, the following information should be considered only as a guideline. Figure illustrates a typical gas supply line installation. It consists of a main between the utility s meter box and the boiler system, a main shut-off valve sediment trap, gas header pipe and drip legs on individual boilers. Figure 9. Connector Rise Individual gas lines to individual boiler modules should be " diameter. Size of gas main and header pipes depends on volume of gas required and acceptable pressure drop between meter and modules gas regulator valves. Minimum pressure required at each valve is inches of water column for natural gas and inches for propane gas, measured while all boilers and other gas-fired equipment on the same meter are firing. Small variations in gas flow can be compensated for by adjusting gas regulator valves. However, final pressure of gas header must vary no more than+ 0. in. of water column. Figure 0. Suggested venting system constructions 9

Table : Gas consumption rate hot water boilers only Model No. Gas Consumption In CFH GGT-00E 00 GGT-00E 00 GGT-00E 00 GGHT-700E 700 GGHT-70E 70 GGHT-800E 798 GGT-900E 900 GGHT-00E 00 GGHT-E GGHT-00E 97 GGT-00E 00 GGHT-00E 00 GGHT-00E 00 GGT-00E 00 GGHT-00E 9 GGHT-70E 70 GGHT-87E 87 GGHT-000E 99 GGHT-00E 00 GGHT-0E 0 GGHT-00E 9 GGHT-0E 0 GGHT-E GGHT-800E 79 GGHT-800E 800 GGHT-000E 000 GGHT-0E 0 GGHT-00E 9 GGHT-7E 7 GGHT-00E 00 GGHT-00E 9 GGHT-70E 70 GGHT-000E 990 Gas Main Sizing To determine the correct pipe diameter for the gas main serving a specific Caravan system, proceed as follows: a. Follow the building plans, find total length of straight pipe between supply from gas meter and boiler gas header. b. Using data in Table, calculate equivalent linear length of screw pipe fittings used in fabrications of main. Add this to figure from step (a) to obtain equivalent total length. c. Find Caravan gas consumption in cubic feet per hour from Table in hot water systems. d. Multiply the system total hourly gas consumption by flow correction value from Table. e. Locate system s total equivalent pipe length in right column of Table. f. Move vertically to the system s corrected flow rate calculated in step (c). If this value falls between two of those listed, select larger value. g. From this point move horizontally to the left column and read suggested pipe diameter for gas main. Table : Equivalent linear length in feet of standard iron pipe fittings for natural gas Pipe Size Inches Standard Elbow Medium Sweep Valve Long Sweep Gate Globe Angle Return end Side Outlet Tee / 0.8 0. 0. 0.0.0... /.7 0.7 0.7 0.0.0.8.7..7 0.98 0.77 0.07.8... -/.9.7.07 0.08..9.7. -/...9 0.098 7.8..9....7.0 0.0.77.0 7.0.7.9.8.0 7.08 7.9 8.8.0 Figure. Typical gas supply line installation 0

Table. Characteristics of various fuel gases Type of Gas Heating Valve* Flow Correction Factor Natural 000 tu.00 Propane 00 tu.0 * per cubic foot Consult fuel supplier for actual TU value. Table. Gas main sizing guide Nominal Iron Pipe Size Inches Internal Diameter Inches Equivalent Length of Pipe, Feet 0 0 0 0 0 0 70 /. 8 /8.9 7 9 0 0 7 /. 9 7 0 /.8 78 90 0 0 9.09 0 0 8 9 80 /.80,00 70 90 00 0 00 70 /.0,00,00 890 70 70 0 0.07,00,00,0,0,70,0,00 /.9,800,00,700,00,000,80,700.08 8,00,900,700,00,00,0,000.0 7,00,000 9,700 8,00 7,00,800,00 80 90 00 0 7 00 /. 0 9 8 8 7 /8.9 8 7 /. 0 8 8 /.8 90 8 79 7 9.09 70 0 0 0 0 0 00 /.80 0 0 0 7 0 0 /.0 0 90 0 0 80 0 0.07 990 90 870 780 70 0 0 /.9,00,00,00,0,0,00 980.08,800,00,00,00,000,80,700.0,800,00,00,00,00,800,00 Maximum capacity of pipe in cubic feet of gas per hour for gas pressures of 0. Psig or less and a pressure drop of 0. inch water column (based on a 0.0 specific gravity gas).

THE OILER STAGING CONCEPT The heart of the Caravan boiler plant is a temperature-actuated control system that automatically stages only those boiler modules needed to meet the heating demand in a given period, thereby conserving fuel. In a staging control system, each stage ordinarily activates one boiler module. With appropriate wiring, multiple modules can be grouped within a stage. During a fluctuation in heating requirements, a large central boiler cycles on and off to match heat output to building demand. A staged modular boiler system, on the other hand, will energize only as many modules as the system load requires. Only one stage cycles at a time. The other stages remain off or operate continuously, thereby performing at peak efficiency. For example, in a 0 module boiler system, with the heating load at % of capacity, six of the modules operate continuously at peak efficiency. Fractional heating requirements are supplied by the seventh "cycling" module, while the remaining three modules are "off." This is in contrast to a single large central boiler that simply cycles on and off, resulting in lower efficiency. Over-sizing is a major factor in poor system efficiency. Most of the time a single central boiler is oversized. Historical data shows that many single central boilers are considerably oversized even at the outdoor temperature for which they were designed. Modular boiler systems are not oversized by more than a portion of one module, regardless of the load. The Caravan control system automatically compensates for seasonal temperature changes. It energizes more or fewer boilers, depending on changes of outside temperature, system water temperature, or both. Modules save energy by operating in long cycles at full-rated output and maximum efficiency. CONTROL SYSTEM SELECTION There are three levels of Caravan System Controls (SC). The choice of one system over another depends on several factors: The type of boilers (hot water or steam, gas or oil), the number of stages and modules involved, and the relative importance of installation costs, fuel economy and occupant comfort as design objectives. Caravan modular boiler control systems are not intended to be the sole building temperature control. Zone controls are required. 00 SERIES CONTROL SYSTEM The 00 series control system provides staging operation to regulate system water temperature with a fixed-ratio, single stage outdoor reset control. The 00 series control is primarily for small to medium sized (, or boilers) gas-fired Caravan systems, where lead/lag is not critical. The supply water temperature is automatically adjusted up or down based on outdoor temperature. Multiple outdoor temperature controls actuate the number of heating modules needed, depending on outdoor temperature. These modules are then cycled as a group by the outdoor reset control. The outdoor reset control has two sensors; one 0 foot long sensor monitoring the outdoor temperature, and one 0 foot long sensor monitoring the system water temperature. The reset ratio is nonadjustable and generally sufficient to provide adequate space heating in most climates. CONTROLS The SCG00 system control group includes the specified 00 series control panel(s) plus all operating and safety controls listed in the bill of materials. ILL OF MATERIALS - SCG00 Space heating only Temperature reset control, T7A, for north wall (with sunshield). * Outdoor temperature control, T7A, for north wall (with sunshields). * One for each space heating module, in excess of one. System enable temperature control, T7A, for north wall (with sunshield). Low water cutoff, PS-8M-0. Manual reset hi-limit, L00E. Space and domestic hot water heating Temperature reset control, T7A, for north wall (with sunshield). * Outdoor temperature control, T7A, for north wall (with sunshields). * One for each space heating module, in excess of one. System enable temperature control, T7A, for north wall (with sunshield). Low water cutoff,ps-8m-0. Manual reset hi-limit, L00E. Domestic hot water, temperature control, L00A. Domestic hot water motorized valve, EMV II. Relays required are to be field furnished. See wiring diagram. 00 SERIES CONTROL SYSTEM The 00 series control system is an extremely accurate and flexible multi-stage microprocessor based control system with automatic lead/lag, designed to sequence heating modules based on outdoor air temperature and supply water temperature. This control is generally applied on systems with up to 0 modules. The SC00 panel consists of a microprocessor mounted in a sheet metal box with adequate wiring knockouts. The panel is furnished with outdoor sensor and water temperature sensor. In the event of a power failure, the control turns all stages off with a time delay between stages for starting when power is restored. The SC00 panel has an adjustable reset ratio, control band and set point and controls through stages. When used with the EC00 -stage expansion panel, up to 0 stages of operation are provided. Individual stage indicating lights are visible with panel cover removed. Desired number of stages can be set in the field. On systems requiring automatic lead/lag and domestic hot water or for systems with more than 0 modules, the 000 series control system is recommended. If Domestic Hot Water is used with the 00 series control system, lead/lag must be disabled. The SCG00 system control group includes the specified 00 series control panel(s) plus all operating and safety controls listed in the bill of materials. ILL OF MATERIALS - SCG00 Space heating only - modules Microprocessor, - stage standard system control panel SC00. Outdoor temperature sensor, C70G. Supply water temperature sensor, C770A. Supply water temperature sensor well and housing, C70D. System enable temperature control, T7A, for north wall (with sunshield).

Low water cutoff, PS-8M-0. Manual reset hi-limit, L00E. In addition to the above, the following additional components are provided for systems with 7 to 0 modules. Microprocessor, 7-0 stage standard expansion control panel, EC00. OPTIONAL ACCESSORIES Pump Control (SC00 series only) automatic pump failure change-over manual pump selector switch alarm circuit and light Test plug kit speed up testing and troubleshooting. Consult factory for other desired options. 000 SERIES CONTROL SYSTEM The 000 series control system is a factory-wired multi-stage microprocessor controlled system which incorporates all the components and features of the 00 series control system, plus visual display readout and provisions for domestic hot water with automatic lead/lag and night set-back features. The system control panel (SC000) is a NEMA- enclosure with a hinged door and keyed lock. Visible indicator lights identify power, heat and active stages. The components are factorywired to a terminal strip that is clearly numbered for connection to common system components such as system enable temperature control, manual reset high limit, low water cutoff and accessory panels such as dual pump control. Two types of lead/lag are featured: LEAD/LAG (FOFO): When all boilers are off and a call for heat occurs, the stage following the last stage off will be the first stage on; use this selection when it is important to evenly distribute boiler operating time. STD (FOFO): When all boilers are off and a call for heat occurs, Stage (closest to the chimney) is always first stage on. The SCG000 system control group includes the 000 series control system panel plus all operating and safety controls listed in the bill of materials. ILL OF MATERIALS - SC000 All SC000 System Control Groups have the following standard components: Microprocessor, - stage deluxe system control panel OR Microprocessor, -8 stage deluxe system control panel PLUS Outdoor temperature sensor and system enabler Supply water sensor The SCG000 System includes items listed above, plus: Low water cutoff Manual reset hi-limit Other options include: Indoor space sensor for non-zoned systems Stage relays Components for domestic hot water which include: EMV II Motorized valve DHW thermostat Circulators, relays, switches and other wiring devices are provided by contractor.

FIELD WIRING AT S

Table C. Reset Ratio and Temperature Set Points at Desired Water and Outdoor Design Temperatures Outdoor Design Temperature Desired Water Temperature Enable 0 F 0 F 80 F 00 F 0 F T-stat Settings F RR SP RR SP RR SP RR SP RR SP +0 0.: 0 : 0 :. 00 : 00 :. 00 +0 0.7: 0 :. 0 :. 0 :. 90 :. 00 0 0.: 0.: 0 : 0 :.8 0 :. 0 0 0.: 0.7: 0 :. 00 :. 00 :.7 00-0 0.: 0 :.8: 0 : 0 :. 0-0 0.: 0 :.9: 0 :. 00 :. 00-0 0.:.:.7:.:.0: -0 0.:.: 0.7: 0.: 0 : 0 Note: RR= Reset Ratio SP= Set Point Table C. Recommended Control and Setting STAGES CONTROL AND SETTING 8 7 8 9 0 Table C. W700J Input Resistance for Number of Controlled Stages NOTES:. The starting temperature on the microprocessor control is modified from 0 F to 70 F. When the outdoor temperature is 70 F or above, boiler water will be maintained at the setpoint temperature. elow 70 F outdoor temperature, boiler water temperature will vary according to the reset ratio setting.. This control is factory set to operate stages. To change the number of operating stages, the appropriate resistor must be installed on the microprocessor control, across spade terminals 7 and 8. Resistors for through stages are shipped with the SC00 panel. Resistors for 7 through 0 stages are shipped with the EC00 panel. See Table C.. The Automatic Lead/Lag function can be disabled by installing a jumper on the microprocessor control, across spade terminals 9 and 0.. On the SC00 control panel, a jumper must be field installed on the microprocessor control, across spade terminals P and P. STAGES RESISTORS COLOR OHMS lue 00 Red 00 Yellow 00 rown 00 Green 00 Gray * 00 7 Orange 700 8 White 800 9 Violet 900 0 lack 000 * stage resistor, factory installed.

SCG-00-S- CARAVAN CONTROL SYSTEM WIRING DIAGRAM Up to space heating modules SUPPLY, PROVIDE DISCONNECT MEANS AND OVERLOAD PROTEC- TION AS REQUIRED. SEE FIGURES C THROUGH C PAGE FOR WIRING TO X X CONNECTIONS. SET SYSTEM ENALE THERMOSTAT (T7A) AT THE TEMPERATURE THAT THE UILDING WILL EGIN TO REQUIRE HEAT (NORMALLY ETWEEN 0 F AND 0 F). MOUNT OUTDOOR SENSING UL ON NORTH (SHADED) WALL IN SUN- SHIELD #88A. LOW WATER CUTOFFS MUST E INSTALLED AT A LOCATION HIGHER THAN THE TOP OF THE OILERS. 7 ON SYSTEMS WITH MULTIPLE LOW WATER CUTOFFS AND/OR MANUAL RESET HIGH LIMITS, REFER TO FIGURES C AND C PAGE FOR PROPER WIRING. ON SYSTEMS WITH ONE LOW WATER CUTOFF, INSTALL A JUMPER ETWEEN TERMINALS AND ON THE LOW WATER CUTOFF. T7A SETTING Determine the proper setting of each T7A thermostat by calculating the percentage of the total heating load that each T7A will energize and apportion this over the operating temperature range (enable temperature minus design outdoor temperature. SEQUENCE OF OPERATIONS - SCG00 Space heating only When outdoor temperature falls below the setting of the system enable temperature control (T7A), the system is activated. The outdoor reset control (T7A) will energize module # and regulate the supply water temperature based on outdoor temperature. As the outdoor temperature continues to drop below the settings of the individual module temperature controls (T7A), more stages are energized. The energized modules are cycled as a group by the outdoor reset control (T7A).

SCG-00-S- CARAVAN CONTROL SYSTEM LADDER DIAGRAM 7

SCG-00-D- CARAVAN CONTROL SYSTEM WIRING DIAGRAM Domestic hot water and space heating Up to space heating modules SUPPLY, PROVIDE DISCONNECT MEANS AND OVERLOAD PRO- TECTION AS REQUIRED. SEE FIGURES C THROUGH C PAGE FOR WIRING TO X X CONNECTIONS. SET SYSTEM ENALE THERMOSTAT (T7A) AT THE TEMPERATURE THAT THE UILDING WILL EGIN TO REQUIRE HEAT (NORMALLY ETWEEN 0 F AND 0 F). MOUNT OUTDOOR SENSING UL ON NORTH (SHADED) WALL IN SUNSHIELD #88A. LOW WATER CUTOFFS MUST E INSTALLED AT A LOCATION HIGHER THAN THE TOP OF THE OILERS. ON SYSTEMS WITH MULTIPLE LOW WATER CUTOFFS AND/OR MANUAL RESET HIGH LIMITS, REFER TO FIGURES C AND C PAGE FOR PROPER WIRING. ON SYSTEMS WITH ONE LOW WATER CUTOFF, INSTALL A JUMPER ETWEEN TERMINALS AND ON THE LOW WATER CUTOFF. DOMESTIC HOT WATER (DHW) OILERS CYCLE AS A GROUP THROUGH FIELD SUPPLIED RELAY(S). SEE WIRING DIAGRAMS FOR CONNECTIONS. EACH DHW OILER REQUIRES A DRY CONTACT CLOSURE. THIS CAN E DONE WITH INDIVIDUAL RELAY(S) FOR EACH OILER OR WITH A SINGLE RELAY WITH DRY CONTACTS FOR EACH DHW OILER(S) AS SHOWN. RELAY(S) ARE FIELD SUPPLIED AND MUST HAVE A 0 VOLT COIL. 7 SET DHW CHANGEOVER THERMOSTAT DESIRED TEMPERATURE FOR DOMESTIC OILERS TO CONTRIUTE TO THE SPACE HEATING LOAD. SEQUENCE OF OPERATIONS - SCG00 Space heating and domestic hot water Domestic modules maintain hot water year round through a L00A aquastat, mounted in the boiler return pipe of the DHW heat exchanger. When outdoor air temperature falls below the setting of the system enable temperature control (T7A), the space heating system is activated. The outdoor reset control (T7A) will energize module # and modulate the supply water temperature based on outdoor temperature. As 8 the outdoor temperature continues to drop below the settings of the individual module temperature controls (T7A), more modules are energized. The energized modules are cycled as a group by the reset control. When the final outdoor temperature control (T7A) calls, and domestic hot water temperature control (L00A) is satisfied, the motorized valve opens, allowing the domestic water modules to contribute to space heating.

SCG-00-D- CARAVAN CONTROL SYSTEM LADDER DIAGRAM 9

SCG-00-S-0-0 CARAVAN CONTROL SYSTEM WIRING DIAGRAM Up to space heating modules Up to stages SYSTEM CONTROLLER SC00 SC00 panel is factory equipped for stage operation. To change the number of operating stages the appropriate resistor must be installed in the SC00 panel, on the microprocessor control, across terminals 7 and 8. Resistors for through stages are shipped with the SC00 panel. Resistors for 7 through 0 stages are shipped with the SC00 panel. See Table C. For proper control settings refer to Tables C and C. Microprocessor control has a two minute time delay between stages. For rapid testing and troubleshooting, the control may be temporarily sped up by using a TP test plug kit. Order Slant/Fin part number 00 (Honeywell part number 07EDJ). This control is equipped with automatic lead/lag which constantly rotates the boiler firing order to ensure even wear. The automatic lead/lag function can be disabled by installing a jumper in the SC00 panel, on the microprocessor control, across terminals 9 and 0. IMPORTANT For more detailed information, refer to the manufacturer s data packed with each component. 0 VAC PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED H N REFER TO FIGS. C THROUGH C ON PG. FOR WIRING AT S. CONTACTS REFLECT CLOSED VALVE. R AND W MAKE ON TEMP. RISE AOVE SET POINT. CONTACT OPENS AT HIGH LIMIT SETTING. RELAYS REFLECT DE-ENERGIZED MODE. REMOTE SENSOR (USE SHIELDED CALE). EMER. SWITCH MANUAL RESET 7 HIGH LIMIT LOCATE IN MAIN SUPPLY HEADER OUTSIDE SENSOR C70G 7 ON SYSTEMS WITH MULTIPLE LOW WATER CUTOFFS AND/OR SUNSHIELD MANUAL RESET HIGH LIMITS, REFER TO FIG. C AND C FOR PROPER WIRING. ON SYSTEMS WITH ONE L.W.C.O., INSTALL A JUMPER ETWEEN TERMINALS AND ON THE L.W.C.O. 8 ASSEMLED " WIRE AND /" OUTSIDE FEMALE QUICK CONNECTORS ARE PROVIDED FOR CONNECTION TO FIELD WIRING ON SC00 AND EC00 PANELS. (WIRE NUTS Y CONTRACTOR) T7A SYSTEM ENALE THERMOSTAT PS-8M 7 LOW WATER CUTOFF NORTH WALL ALARM OPTIONAL (Y OTHER) R W INSIDE H N 0V WIRE IN SERIES WITH SYSTEM PUMP START CIRCUIT TRANSFORMER 0VA (Y CONTRACTOR) GND OHM RESISTOR C770A00 SUPPLY WATER TEMPERATURE SENSOR C70D0 INSERTION WELL AND ENCLOSURE SYSTEM PUMP CONTACTOR 0V COIL (C) (Y CONTRACTOR) V NUMER OF STAGES RESISTOR (SEE TALE ) INSTALL JUMPER NOT USED 8 0 9 8 7 T T P P GND TR TR PS-8M L.W.C.O. VAC LEAD/LAG DISALE NO STAGES RESET SENSOR REMOTE SETPOINT SATELLITE W700J MICROPROCESSOR HEAT 00 80 : 0 : SET POINT F : 0 : CONTROL AND F 0 0 RESET RATIO SUPPLY WATER SENSOR C770A 8 : 80 : 00 0 : HEAT HEAT HEAT HEAT HEAT C A C A C A C A C A C A SEE AOVE FOR CONNECTION CONNECTION TO S (TYPICAL) CONTACTOR (C) (Y CONTRACTOR) L L L L HTG L HTG L L L L L HTG L HTG L HTG L HTG L SYSTEM PUMP (Y CONTRACTOR) MANUAL RESET HI-LIMIT L00E () Space Heating Modules Sequence of operation - SCG00 Space heating only When outdoor temperature falls below the setting of the system enable temperature control (T7A), the system is enabled. The 00 series control system energizes the necessary modules to maintain sufficient supply water temperature based upon outdoor air temperature demand. As outdoor air temperature changes, the system will automatically increase or decrease the number of operating modules until supply water temperature meets outdoor air temperature demand. The control system also operates the boilers with automatic lead/lag, ensuring equal run-time for each boiler. If desired, the automatic lead/lag can be disabled by installing a jumper, on the microprocessor control, across terminals 9 and 0. 0

SCG-00-S-0-0 CARAVAN CONTROL SYSTEM LADDER DIAGRAM

SCG-00-D-0-0 CARAVAN CONTROL SYSTEM WIRING DIAGRAM Domestic hot water and space heating Up to space heating modules REFER TO FIGURES C THROUGH C PAGE FOR WIRING TO AT S. CONTACTS REFLECT CLOSED VALVE. R AND W MAKE ON TEMPERATURE RISE AOVE SET POINT. CONTACT OPENS AT HIGH LIMIT SETTING. RELAYS REFLECT DE-ENERGIZED MODE. REMOTE SENSOR (USE SHIELDED CALE). 7 ON SYSTEMS WITH MULTIPLE LOW WATER CUTOFFS AND/OR MANUAL RESET HIGH LIMITS, REFER TO FIG. C AND C FOR PROPER WIRING. ON SYSTEMS WITH WITH ONE L.W.C.O., INSTALL A JUMPER ETWEEN TERMINALS AND ON THE L.W.C.O. 8 ASSEMLED " WIRE AND /" FEMALE QUICK CONNECTORS ARE PRO- VIDED FOR CONNECTION TO FIELD WIRING ON SC00 AND EC00 PANELS. (WIRE NUTS Y CONTRACTOR) T7A DHW CHANGEOVER THERMOSTAT SUNSHIELD R W TRANSFORMER 0VA (Y CONTRACTOR) GND 0V V W700J MICROPROCESSOR HEAT GND TR VAC TR C A CONNECTION TO S (TYPICAL) OUTSIDE SENSOR C70G R T7A SYSTEM ENALE THERMOSTAT W SUNSHIELD OUTSIDE INSIDE SYSTEM PUMP CONTACTOR 0V COIL (C) (Y CONTRACTOR) NUMER OF STAGES RESISTOR (SEE TALE ) OHM RESISTOR C770A00 INSTALL SUPPLY WATER JUMPER TEMPERATURE SENSOR C70D0 INSERTION WELL NOT USED & ENCLOSURE 8 0 9 8 7 T T P P LEAD/LAG DISALE NO STAGES RESET SENSOR REMOTE SETPOINT SATELLITE 00 80 : : CONTROL AND F 0 : SETPOINT F : 0 RESET RATIO 0 0 8 : 80 : 00 0 : HEAT HEAT HEAT HEAT HEAT C A C A C A C A C A S (R) DPST RELAY 0V COIL (Y CONTRACTOR) DHW THERMOSTAT L00A W R WIRE IN SERIES WITH SYSTEM PUMP START CIRCUIT 0 VAC PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED H N EMER. SWITCH MANUAL RESET 7 HIGH LIMIT LOCATE IN MAIN SUPPLY HEADER PS-8M LOW WATER CUTOFF 7 ALARM OPTIONAL (Y OTHER) H N (R) DHW RELAY (R) DHW RELAY 0V COIL SPST 0V COIL SPST (Y CONTRACTOR) (Y CONTRACTOR) TO DHW TO DHW DHW CIRCULATOR RELAY 0V COIL (C) (Y CONTRACTOR) WIRE IN SERIES WITH DHW CIRCULATOR START CIRCUIT END SWITCH OPEN CLOSE EMV II EMV II 0V COIL MOTORIZED VALVE Service Water DHW THERMOSTAT L00A P/ SERIES HEAT EXCHANGER DHW PUMP Mixing Valve (or Storage Tank) recommended SEE AOVE FOR CONNECTION EMV-II MOTORIZED VALVE PS-8M L.W.C.O. SUPPLY WATER SENSOR C770A CONTACTOR (C) (Y CONTRACTOR) L L L L L L DHW L DHW L HTG L HTG L SYSTEM PUMP (Y CONTRACTOR) MANUAL RESET HI-LIMIT L00E () Domestic Hot Water Modules () Space Heating Modules SEQUENCE OF OPERATION - SCG00 Space heating and domestic hot water When outdoor temperature falls below the setting of the system enable temperature control, the space heating system is enabled. The microprocessor control will energize the necessary modules to maintain sufficient supply water temperature based upon outdoor air temperature. As the outdoor temperature changes, the control system will increase or decrease the number of operating modules to meet the supply water temperature required by the outdoor temperature. The modules operate with automatic lead/lag, first on - first off (FOFO), or lead/lag can be disabled to operate first on - last off. When the outdoor temperature falls below the setting of the outdoor DHW Changeover Thermostat, and domestic hot water (DHW) is satisfied, and stage is energized, the DHW valve opens, allowing the domestic hot water modules to contribute to space heating.

SCG-00-D-0-0 CARAVAN CONTROL SYSTEM LADDER DIAGRAM

SCG-000- CARAVAN CONTROL SYSTEM WIRING DIAGRAM Space heating Up to space heating modules PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED Y LOCAL CODE. SYSTEM PUMP FOR HOT WATER SYSTEM ONLY. SHIELDED CALE IS RECOMMENDED WHEN WIRING SENSORS. REFER TO FIGURE C THROUGH C ON PAGE FOR WIRING AT S. SPACE HEATING S SHOWN; UP TO S OF SPACE HEATING S CAN E CONNECTED. WHEN TERMINALS AND ARE JUMPED THERE IS A 0V OUTPUT ON TERMINALS 0 AND. WHEN TERMINALS AND AND AND 7 ARE JUMPED THERE IS A 0V OUTPUT ON TERMINALS AND.. AMPS PER TERMINALS 0 AND AND AND TOTAL AMPS MAX. MANUAL RESET HI-LIMIT L00E INSTALL JUMPER TO SC000 PANEL TERMINALS # & ALARM OPTIONAL (Y OTHER) 0 VAC H N PS-8M L.W.C.O. H N SPACE SENSOR TE-00- (OPTIONAL) MAIN CIRCUIT REAKER TO PUMP CONTACTOR SUPPLY WATER SENSOR TE-00- EMERGENCY SWITCH JUMPER H N 0 VAC OUTPUT OUTDOOR SENSOR TE-00- (LOCATE ON NORTH WALL) (NOT USED SET POINT ONLY) FLOW SUMMER/ FROM SWITCH WINTER SW. SOURCE OPTIONAL SWITCHES JUMPER HOT 0 VAC NEU 7 8 9 0 7 8 GND 9 SPACE 0 SENSOR GND WATER SENSOR GND OUTDOOR SENSOR 7GND L 0V TO S L SC-000 A A A A A A 7A 7 8 9 0 7 8 9 0 7 8 9 0 NC 8 NO 7 C 8 8 7 CONTACTOR (C) (Y CONTRACTOR) L L PS-8M L.W.C.O. SYSTEM PUMP (Y CONTRACTOR) SUPPLY WATER SENSOR TE-00- MANUAL RESET HI-LIMIT L00E L L L L HTG. L HTG. L HTG. L HTG. L SEQUENCE OF OPERATIONS - SCG000 Space heating only When outdoor temperature falls below the outdoor start temperature setting, the system is enabled. The microprocessor control will energize the necessary modules to maintain sufficient supply water temperature based upon outdoor air temperature. As the outdoor temperature changes, the control system will increase or decrease the number of operating modules to meet the supply water temperature required by the outdoor temperature. The modules operate with automatic lead/lag, first on - first off (FOFO) or, after all boilers are off, stage is first on - then FOFO. A space sensor can be installed (usually with most nonzoned systems). This modifies the selected supply water temperature, to accurately meet the space temperature selected. The control has built-in set-back programming capability.

SCG-000- CARAVAN CONTROL SYSTEM LADDER DIAGRAM L 0 VAC L Emerg Service C System Pump Service Provide disconnecting means and overload protection as required by local codes. K K K K 8 9 7 0 Htg. Module L # L Htg. Htg. Htg. Module Module Module L # L L # L L # L L 0 VAC L Service Provide disconnecting means and overload protection as required by local codes. R L00E Manual Reset HiLimit (0 typ) K 9 (OPTIONAL) Space Sensor System Pump C Contactor (NOT USED SET POINT) Supply Water Outside Air Temp Sensor Temp Sensor 9 0 G G G Microprocessor Control Circuit K THROUGH K SEE AOVE G 7 9 0 7 * 0 VAC OUTPUT. AMPS MAX. ** 0 VAC OUTPUT. AMPS MAX. 8 ** * SEE FIG. C THROUGH C FOR CONNECTION AT. 0V OUTPUT WHEN TERMINALS ( AND ) ARE JUMPED. 0V OUTPUT WHEN TERMINALS ( AND ) AND ( AND 7) ARE JUMPED.

SCG-000-D- CARAVAN CONTROL SYSTEM WIRING DIAGRAM Domestic hot water and space heating Up to space heating modules PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED Y LOCAL CODES. SYSTEM PUMP FOR HOT WATER SYSTEM ONLY. SHIELDED CALE IS RECOMMENDED WHEN WIRING SENSORS. REFER TO FIGURE C AND C ON PAGE FOR WIRING AT S. UP TO SPACE HEATING S CAN E CONNECTED, TWO DOMESTIC S ARE SHOWN. MORE DOMESTIC S CAN E ADDED. DHW RELAY OR RELAYS MUST HAVE ONE N.O. CONTACT PER. WHEN TERMINALS AND ARE JUMPED THERE IS A 0V OUTPUT ON TERMINALS 0 AND. WHEN TERMINALS AND AND AND 7 ARE JUMPED THERE IS A 0V OUTPUT ON TERMINALS AND.. AMPS PER TERMINALS 0 AND AND AND TOTAL AMPS MAX. MANUAL RESET HI-LIMIT L00E 0 VAC PS-8M L.W.C.O. H INSTALL JUMPER N ALARM OPTIONAL (Y OTHER) SPACE SENSOR TE-00- (OPTIONAL) H N MAIN CIRCUIT REAKER TO PUMP CONTACTOR SUPPLY WATER SENSOR TE-00- EMERGENCY SWITCH JUMPER H N 0 VAC OUTPUT OUTDOOR SENSOR TE-00- (LOCATE ON NORTH WALL) (NOT USED SET POINT ONLY) 0V NEUT. JUMPER C CONTACTOR & SERVICE SWITCH SIZED ACCORDING TO DHW PUMP LOAD HOT 0 VAC NEU 7 8 9 0 7 8 GND 9 SPACE 0 SENSOR GND WATER SENSOR GND OUTDOOR SENSOR 7GND DHW PUMP SC-000 A A A A 8 9 0 7 8 9 0 A 7 A 7A 7 8 9 0 NC 8 NO 7 C 8 HTG HTG HTG HTG HTG HTG HTG 7 0V TO S L00A DHW THERMOSTAT W R L SUMMER/ FLOW FROM WINTER SW. SWITCH SOURCE OPTIONAL SWITCHES L DOULE POLE RELAY () N.O. CONTACTS DHW # L L R DHW # L L MORE THAN TWO S SEE DHW THERMOSTAT L00A P/ SERIES HEAT EXCHANGER DHW PUMP Service Water Mixing Valve (or Storage Tank) recommended TO SC000 PANEL TERMINALS # & JUMPER OPEN EMV-II MOTORIZED VALVE CLOSE EMV-II MOTORIZED VALVE PS-8M L.W.C.O. SUPPLY WATER SENSOR TE-00- CONTACTOR (C) (Y CONTRACTOR) L L L L L L DHW L DHW L HTG L HTG L SYSTEM PUMP (Y CONTRACTOR) MANUAL RESET HI-LIMIT L00E () DOMESTIC HOT WATER S () SPACE HEATING S Sequence of operation - SCG000 Space heating and domestic hot water When the outdoor temperature falls below the outdoor start temperature setting, the space heating system is enabled. The microprocessor control will energize the necessary modules to maintain sufficient supply water temperature based upon outdoor air temperature. As the outdoor temperature changes, the control system will increase or decrease the number of operating modules to meet the supply water temperature required by the outdoor temperature. The modules operate with automatic lead/lag, first on - first off (FOFO) or, after all boilers are off, stage is first on - then FOFO. With all space heating stages energized, if the space load exceeds the stages capacity, and domestic hot water is satisfied, the domestic hot water valve will open, allowing the domestic water modules to contribute to space heating. A space sensor can be installed (usually with most non-zoned systems). This modifies the selected supply water temperature, to accurately meet the space temperature selected. The control has built-in set-back programming capability.

SCG-000-D- CARAVAN CONTROL SYSTEM LADDER DIAGRAM L 0 vac L Emerg Service C System Pump Service C DHW Pump Service Provide disconnecting means and overload protection as required by local codes. K K 8 9 R R Htg. Htg. DHW DHW Module Module Module Module L # L L # L L # L L #L L 0 vac L Service Provide disconnecting means and overload protection as required by local codes. R L00E Manual Reset HiLimit (0 typ) K 9 System Pump Contactor C (OPTIONAL) Space Sensor (NOT USED SET POINT) Supply Water Outside Air Temp Sensor Temp Sensor 9 0 G G G Microprocessor Control Circuit K THROUGH K SEE AOVE G Jumper 7 PS-8M Manual Reset L.W.C.O. 9 0 7 DHW Pump C ** 0 VAC OUTPUT Contactor 8 K8 7 R 7 L00A DHW T stat W R Open Close Dpst relay EMV-II DHW Valve Open Run/ Close 8 ** SEE FIG. C THROUGH C FOR CONNECTION AT. 0V OUTPUT WHEN TERMINALS ( AND ) AND ( AND 7) ARE JUMPED. 7

SLANT/FIN CORPORATION, Greenvale, N.Y. 8 Phone: () 8-00 FAX: () 8-9 Canada: Slant/Fin LTD/LTEE, Mississauga, Ontario www.slantfin.com 8