Installation Instructions

Transcription

1 Installation Instructions EHMA SERIES ELECTRIC HEATERS FOR PAM3 SERIES PACKAGE AIR CONDITIONERS PHM3 SERIES PACKAGE HEAT PUMPS TABLE OF CONTENTS SAFE INSTALLATION REQUIREMENTS... 2 GENERAL INFORMATION... 2 ELECTRIC HEATER TABLE USAGE... 2 ELECTRIC HEATER INSTALLATION... 3 HEATER ELECTRICAL WIRING... 5 BLOWER SPEED TAPS AND PERFORMANCE DATA... 5 GROUNDING... 6 ADJUSTING ANTICIPATOR... 6 LIMIT CONTROLS... 6 STAGING... 6 INSTALLING WIRING... 6 RAINSHIELD INSTALLATION... 6 TEMPERATURE RISE CHECK... 7 UNIT WIRING DIAGRAMS HEATER WIRING DIAGRAMS PAM3 SUPPLEMENTARY ELECTRICAL HEAT DATA PHM3 SUPPLEMENTARY ELECTRICAL HEAT DATA Printed in U.S.A. 9/13/

2 SAFE INSTALLATION REQUIREMENTS Installation and servicing of air--conditioning equipment can be hazardous due to system pressure and electrical components. Only trained and qualified personnel should install, repair, or service air--conditioning equipment. Untrained personnel can perform basic maintenance functions of cleaning coils and filters. All other operations should be performed by trained service personnel. When working on air--conditioning equipment, observe precautions in the literature, tags, and labels attached to the unit, and other safety precautions that may apply. Follow all safety codes. Wear safety glasses and work gloves. Use quenching cloth for unbrazing operations. Have fire extinguisher available for all brazing operations.! FIRE, EXPLOSION, AND ELECTRICAL SHOCK HAZARD Improper installation, adjustment, alteration, service, maintenance, or use could cause fire or an explosion which could result in personal injury or unit damage. Consult a qualified installer or service agency for information or assistance. The qualified installer or agency must use only factory -authorized kits or accessories when modifying this product. hazards which will result in serious injury or death. WARNING signifies a hazard which could result in serious injury or death. CAUTION is used to identify unsafe practices which may result in minor personal injury or product and property damage. NOTE is used to highlight suggestions which will result in enhanced installation, reliability, or operation. These instructions cover minimum requirements and conform to existing national standards and safety codes. In some instances, these instructions exceed certain local codes and ordinances, especially those that may not have kept up with changing residential construction practices. We require these instructions as a minimum for a safe installation.! ELECTRICAL SHOCK HAZARD Failure to follow this warning could result in personal injury, death and/or property damage. Unit may have more than one power source. Before performing service or maintenance operations on unit, turn off all unit main power switch(s) and install lockout tag(s). General Information These heaters are comprised of a separate heater module mounted on the blower inlet and remote mounted controls. Recognize safety information. This is the safety--alert!. When you see this symbol in instructions or manuals, be Unless an optional single point kit is used, two separate field alert to the potential for personal injury. power supplies MUST be provided -- one or more for the electric Understand the signal words DANGER, WARNING, CAUTION, and NOTE. These words are used with the safety--alert symbol. DANGER identifies the most serious heat accessory and one for the unit. These heaters are intended for use only in packaged units as noted in Table 1. TABLE 1 - ELECTRIC HEATER USAGE CHART EHMA Heater Model No s (Example: EHMA05KN) Without Circuit Breakers O5KN 07KN 10KN With Circuit Breakers O5KB 07KB 10KB 15KB 20KB Unit kw 5kW 7.5kW 10kW 15kW 20kW PAM3 USED ON 24 X X X X X X 30 X X X X X X X 36 X X X X X X X X 42 X X X X X X X X 48 X X X X X X X 54 X X X X X X X PHM3 USED ON 24 X X X X X 30 X X X X 36 X X X X X X 42 X X X X X X 48 X X X X X 54 X X X X X

3 Electric Heat Installation FIGURE 3 Heater Control Panel and Spacer 1. Open all electrical disconnects and install lock--out tag before beginning any installation or service work. 2. Check for proper equipment model number from list in Table Remove blower access panel to access control box and blower compartment (see Fig 1). Heater Control Panel FIGURE 1 Access Blower Controls Spacer Screws 10. Insert heater control panel into unit and secure to left cabinet flange with (2) screws provided. (See Fig 4). FIGURE 4 Secure Heater Control Panel Screws 4. Disconnect wiring to motor by removing speed selection and power plugs from bottom of motor. 5. Remove rear blower support bracket; set bracket and attached motor wiring on top of unit. 6. Remove screws securing blower to front blower support bracket; slide blower out of unit. 7. Open heater package and remove heater module; secure heater module to standoffs on blower inlet with (3) screws and (3) washers provided (see Fig 2) and reinstall heater/blower assembly. 11. Orient spacer to compensate for the available space between the back of the control panel and the unit discharge duct (See Fig 5); secure the spacer to the control panel with (2) screws provided. When properly installed, the rear of the spacer will rest on the vertical surface of the unit discharge duct; use screw provided to attach spacer to discharge duct wall. FIGURE 2 Install Heater Module FIGURE 5 Secure Spacer Orient Spacer as Required 8. Reinstall rear blower support bracket and attached motor wiring -- do not reattach motor wiring plugs to motor at this time. 9. Open heater package and remove heater control panel and spacer. (see Fig 3) Attach to Duct Panel

4 12. Low voltage wires from heater control panel terminate in a harness plug; the mating 5 pin connector is located on the unit fan control board at position P4. Route the heater low voltage harness into the unit control box through the hole in the left bottom of unit control box; then route the harness along the bottom of the unit control box. Connect mating heater and fan control board plugs, dress wires and secure them to existing unit wires with wire ties provided. (See Fig 6). FIGURE 8 Connect Control Panel and Heater Module FIGURE 6 Connect Low Voltage Harness Wire Ties Fan Control Plug 13. For heaters with circuit breakers, a separate circuit breaker may be installed for the unit (see unit instructions for additional details); if used, the black and yellow pigtails from the unit control panel should be connected to the load lugs of this circuit breaker (See Fig 7). For heaters equipped with terminal block, connect the black and yellow pigtails from the unit control panel directly to their own individual field power supply using approved electrical connectors. FIGURE 7 Install and Wire Unit Circuit Breaker Unit Pigtails 16. Determine minimum airflow for safe heater operation from Table 2 and relocate Black wire in motor fan speed selection plug to required speed tap position (see Fig 9). This wire may easily be relocated to the required position by depressing the associated tab in the front of the plastic housing, removing wire from the back of the housing and reinserting it into the proper position (listen for the click upon reinsertion to insure that the terminal is properly seated). Refer to Figure 10 and page 6 for airflow vs speed tap information. TABLE 2 - MINIMUM AIRFLOW FOR HEATER OPERATION Unit kw 5kW 7.5kW 10kW 15kW 20kW PAM3 Minimum Airflow (CFM) PHM FIGURE 9 Select Motor Speed Tap Pos.#5 Pos.#4 Pos.#3 Pos.#2 Pos.#1 14. Attach the adhesive backed wiring label provided with the heater to the unit discharge duct. 15. Locate the black and yellow power wires from the heater module; these wires will terminate in plug connectors that mate with the plug from the heater control installed above. Snap these connectors into place, insuring that the wire colors match. Dress and secure these wires to fan wires with wire ties provided (See Fig 8). Black Wire Red Wire

5 17. Reinsert motor power plug into the rear opening in the mating motor housing and then reinsert the motor speed selection plug. Note that these plugs are interlocked both to the motor housing and each other to insure correct reinsertion. 18. If heater is equipped with circuit breakers, remove the cover plate on the access panel and retain the screws. Install the breaker rain shield to the blower access panel per instructions; this rain shield kit is provided with the heater. 19. Reattach the blower access panel and proceed to Heater Electrical Wiring Mark an X in the appropriate box for the heater on the unit rating plate. Heater Electrical Wiring! ELECTRICAL SHOCK HAZARD. Failure to follow this warning could result in personal injury, death and/or property damage. Before performing service or maintenance operations on unit, turn off unit main power switch and install lockout tag. Unit MUST be grounded before making line voltage connections. Do NOT fuse ground or neutral conductors. NOTE: All electrical work MUST conform with the requirements of local codes and ordinance and in the United States with National Electrical Code ANSI/NFPA70 current edition. Provide line voltage power supply from a separate protected circuit with a disconnect switch (when required) located with sight of the unit. Supply voltage, amperage, fuse and disconnect switch sizes MUST conform with all technical specifications in this manual and on the unit rating plate and local codes. Wiring MUST be protected from possible mechanical damage and MUST NOT interfere with removal of access panels, filters, etc. All exposed wiring or connections MUST be made with weatherproof cable or wire unless installed in conduit. All line voltage connections and the ground connection MUST be made with copper wire. The power supply wiring MUST have overcurrent protection. This can be either fuses or circuit breakers. The maximum size for the overcurrent protection is shown in the column labeled Max. fuse or NEC HACR Breaker (Amps) in the Electrical Data Table on the unit rating plate. FIGURE 10 Blower Speed Tap Settings and Blower Performance Data Blower Speed Tap Settings Rated Airflow High Airflow 2 TON Tap 1 Tap / 2 TON Tap 2 Tap 3 3 TON Tap 1 Tap / 2 TON Tap 3 Tap 4 4 TON Tap 3 (Hi); 1 (Lo) Tap 4 (Hi); 2 (Lo) 5 TON Tap 3 (Hi); 1 (Lo) Tap 4 (Hi); 2 (Lo) Table - 3: BLOWER PERFORMANCE DATA - PAM3 / PHM3 Model Number PAM/PHM324 PAM/PHM330 PAM/PHM336 PAM/PHM342 Speed Tap Air Delivery in Varying External Static Pressure (in. w.c.) BLOWER PERFORMANCE DATA - PAM3 / PHM3 (Cont.) Model Number PAM/PHM348 PAM/PHM354 Speed Tap Air Delivery in Varying External Static Pressure (in. w.c.) Rated ARI standard conditions, 95 Amb, 80 DB/67 WB, 230 Volts. For applications at 208 volts deduct 1000 BTU. Air listed external static pressure are taken at 230Volts with Dry coil, no filter and approved heater. Air delivery against shown external static pressures taken with 230V. to unit, dry coil and equipped with approved heater. For wet coils add.05 W.C to Ext. Static Press. measurement. NOTE: For 208 Volt applications, reduce airflow by 15%

6 Grounding Permanently ground the electric heat accessory in accordance with local codes and ordinances and in the United States with National Electrical Code ANSI/NFPA70 current edition. Use a copper conductor of the appropriate size from the electric heat accessory to the ground lug on the circuit breaker panel. On models with more than one circuit, a separate copper ground wire MUST be connected for each circuit. Adjusting Thermostat Anticipator Set the heat anticipator of the thermostat to the proper value. See instructions provided with the thermostat before making this adjustment. ANTICIPATOR SETTINGS Model Number Anticpator Setting EHMA05KB/N 0.09 EHMA07KB/N 0.18 EHMA10KB/N 0.18 EHMA15KB 0.27 EHMA20KB 0.36 Limit Controls The limit controls are mounted on the face of the heater and are wired into the supply wires to each element. If there is not enough air flow through the heater, the limit will open and break the power circuit. The limit will reset when the electric accessory cools down. Staging Heater elements are controlled ON and OFF through one or more relays which operate through the low voltage thermostat circuit. As received from the factory, heaters are wired to operate in either 1 or 2 stages. STAGING Model Number Stage 1 Stage 2 EHMA05KB/N 1@5KW NA EHMA07KB/N 3.75 KW 3.75 KW EHMA10KB/N 1@5KW 1@5KW EHMA15KB 1@5KW 2@5KW EHMA20KB 2@5KW 2@5KW Some electric utilities require staging on electric heaters larger than 6 kilowatts. The heater elements can be turned on in stages using either multi--stage indoor thermostats or accessory outdoor thermostats. If indoor thermostats with 2 stage electric heat capability are used, simply connect the thermostat to the White and Violet low voltage pigtail leads. If electronic indoor thermostats with multiple stages of electric heat are used, and it is desired to add additional stages of heat, it will be necessary to break the Pink and Grey low voltage leads between the fan control board and heater control; this will require field modification of the control wiring and should only be done by an experienced controls technician. If staging based on heat loss or demand is required, the use of accessory outdoor thermostats is recommended. This will require breaking the low voltage leads between the fan control board and heater control and will require field modification of the control wiring; this should be done by an experienced controls technician. Outdoor thermostats available through your wholesale supplier allow the control of stages of electric heat. These heaters are comprised of a separate heater module mounted on the blower inlet and remote mounted controls. Unless an optional single point kit is used, two separate field power supplies MUST be provided -- one or more for the electric heat accessory and one for the unit. These heaters are intended for use only in packaged units as noted in Table 1. Installing Wiring 1.Shut OFF electric power at unit disconnect or service panel. 2.Install the appropriate field supplied conduit fitting into the heater knockout located in the side panel of the unit. The wiring entrance hole is sized 1 in diameter. 3.Connect field installed copper ground wire(s) to the ground lug(s) on the heater mounting plate. On heaters with more than one circuit, a separate copper ground wire MUST be connected to a separate ground lug for each circuit. 4.Route the field supplied line voltage wires for the heater to the line side of the electric heat accessory s circuit breaker(s) or terminal block. Leave approximately 8 of excess wire so the breaker may be moved to service. Make line voltage connections to L3--L6 as appropriate. After completing installation of the heater, install the breaker rain shield on the blower access panel according to the following instructions. If using a non--breaker heater, proceed to Start--Up Procedures for Auxiliary Electric Strip Heat. Rain Shield Installation FIGURE 11 Rain Shield Hinged Cover Installing The Rain Shield Lower Frame Filler Plate(s) Breaker Cover 1.Remove all screws from the cover plate on Blower/Electrical Access Panel. 2. With the Access Panel laying flat, arrange hinged cover, lower frame, filler plate(s) and breaker cover so that they align with holes in access panel. 3.Screw 4 screws thru to hinged cover and 4 screws thru to lower frame. 4. Re -install blower/electrical access panel. NOTE: VERIFY ALL APPROPRIATE SEALS ARE IN PLACE. SEE FIGURE

7 Temperature Rise Check Temperature rise is the difference between the supply and return air temperatures. The temperature rise should be ± 2 F(1.1 C) of the temperature rise shown in Tables5or7. NOTE: The temperature rise can be adjusted by changing the heating speed tap at the unit s blower terminal block. Refer to the unit s Installation Instructions for airflow information. A temperature rise greater than 60 F (33.3 C) is not recommended. (This applies to electric heat only). 1.To check the temperature rise through the unit, place thermometers in the supply and return air ducts as close to the unit as possible. 2.Open ALL registers and duct dampers. 3.Set thermostat Heat--Cool selector to HEAT. 4.Set the thermostat temperature setting as high as it will go. 5.Turn electric power ON. 6.Operate unit AT LEAST 5 minutes, then check temperature rise. NOTE: The maximum outlet air temperature for all models is 200 F (93.35C). Maximum temperature rise for electric heat is 60 F (33.35C) 7.Set thermostat to normal temperature setting. 8.Turn electric power OFF. 9 Change blower speed tap if 60 F (33.3 C) Temperature Rise was exceeded and repeat. 10.Be sure to seal all holes in ducts if any were created during this process

8 PHM

9 PHM

10 PAM

11 PAM

12 HEATER WIRING

13 HEATER WIRING

14 HEATER WIRING

15 HEATER WIRING

16 PAM3 Supplementary Electrical Heat Data Table 4: PAM3 - ELECTRICAL DATA: ELECTRIC HEAT ACCESSORY HEATER MODEL Used With Supply Voltage KW Rating Nominal Heating BTUH Supply Circuit No. Heater Amps Mininum Circuit Ampacity Max. Overcurrent Protective Device (Amps) EHMA05KB 2to5Ton ,065 L3 - L EHMA05KN ,798 L3 - L EHMA07KB 2to5Ton ,598 L3--L EHMA07KN ,113 L3--L EHMA10KB 2to5Ton ,130 L3 - L ,598 L3 - L EHMA10KN 2to3--1/2Ton ,130 L3 - L ,598 L3 - L EHMA15KB 2--1/2 to 5 Ton L3 - L ,195 L5 - L ,567 L3 - L L5 - L EHMA20KB 3to5Ton L3 - L ,260 L5 - L ,195 L3 - L L5 - L Table 5: PAM3 - PERFORMANCE DATA: ELECTRIC HEAT ACCESSORY *Temperature Rise F@CFM Heater Model Use With Supply Voltage KW Rating Total Heating BTUH EHMA05KB 2to5Ton , EHMA05KN , EHMA07KB 2to5Ton , EHMA07KN , EHMA10KB 2to5Ton , , EHMA10KN 2to3--1/2Ton , , EHMA15KB 2--1/2 to 5 Ton , , EHMA20KB 3to5Ton , ,

17 PHM3 Supplementary Electrical Heat Data Table 6: PHM3 - ELECTRICAL DATA: ELECTRIC HEAT ACCESSORY HEATER MODEL Used With Supply Voltage KW Rating Nominal Heating BTUH Supply Circuit No. Heater Amps Mininum Circuit Ampacity Maximum Overcurrent Protective Device (Amps) EHMA05KB 2to5Ton ,065 L3 - L ,798 L3 - L EHMA05KN 2to3--1/2Ton ,065 L3 - L ,798 L3 - L EHMA07KB 2to5Ton ,598 L3--L ,113 L3--L EHMA07KN 2Ton ,598 L3--L ,113 L3--L EHMA10KB 2to5Ton ,130 L3 - L ,598 L3 - L EHMA15KB 3to5Ton L3 - L ,195 L5 - L ,567 L3 - L L5 - L EHMA20KB 3to5Ton L3 - L ,260 L5 - L ,195 L3 - L L5 - L Table 7: PHM3 - PERFORMANCE DATA: ELECTRIC HEAT ACCESSORY *Temperature Rise F@CFM Heater Model Use With Supply Voltage KWRating Total Heating BTUH EHMA05KB 2to5Ton , , EHMA05KN 2to3--1/2Ton , , EHMA07KB 2to5Ton , , EHMA07KN 2Ton , , EHMA10KB 2to5Ton , , EHMA15KB 3to5Ton , , EHMA20KB 3to5Ton , ,