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2. Route low voltage wire from load control device to terminal block. Connect field wiring to RP and P positions. Dry Contact Peak Control Switch The maximum coil size the factory supplied return air plenum can accomodate through the front access is 25.5" (W) x 22" (D) x 29.93" (H). The inner dimensions of the coil area are 26" (W) x 22" (D) x 30.96" (H). 8 Blower Speed P4 Water R1 Y12 Y2 2 O 2 D2 R2 D1 P10 P5 P3 P2 Peak Inputs Aux. Relay RP P AP P1 P8 Air E J6 A B C D C3 Y2 J5 D5 D7 D3 R C J1 J2 J3 J4 P11 O H/E Y1 The 3120 Comfort Plus heating system can accommodate most heat pump or air conditioner indoor coils up to a 3 1/2 ton capacity provided the heat pump or air conditioner is sized in accordance to supply air delivery rates of the Comfort Plus. W W/ AUX Y1 Y2 G Outdoor Outdoor Risk of fire. Any one ducting system MUST NOT contain more than one air handling (blower) system. Comfort Plus LV Circuit Board P6 P9 R C P7 D6 RLY1 D4 Fid 2 To Control Board Blower To Control Board If utilizing a Steffes Time Clock Module or Power Line Carrier control, refer to the instructions shipped with that device for installation information. LINE VOLTAGE ELECTRICAL CONNECTIONS B L O W E R S /C O N T R O L S C IR C U IT C H A R G E C IR C U IT # 1 WARNING C H A R G E C IR C U IT # 2 HAZARDOUS VOLTAGE: Risk of electric shock. Can cause injury or death. Do not energize the Comfort Plus heating system until installation is complete. LINE 2 C ir c u it B r e a k e r s Full Load Current To reduce electromagnetic fields associated with electrical circuits and to avoid induced voltage on sensors and electronic devices, the circuit phases MUST be alternated as shown. Show n for 240VAC only. Circuit deration not included. Model DO NOT install any wiring in the line voltage compartment of the Comfort Plus heating system unless it is rated for line voltage. Control Crct Chrg Crct #1 Chrg Crct #2 3120 - 14.0kW 6.00 29.17 29.17 3120 - 17.0kW 6.00 36.46 36.46 3120 - 21.6kW 6.00 45.00 45.00 LOW VOLTAGE OUTDOOR SENSOR CONNECTIONS R2 RLY1 Fid 2 Blower Speed P4 D2 P10 D1 P5 P3 P2 NC P8 Comfort Plus LV Circuit Board R P7 P6 D6 D4 Blower To Control Board NO Aux. Relay COM Peak Inputs RP P AP P1 Air C3 R1 Y12 Y22 O2 Water D5 D7 D3 R C E J6 A B C D P11 O H/E Y2 J5 W/ AUX Y1 Y2 G Outdoor Outdoor Outdoor Sensor W Direct Wired: 1. Mount outdoor sensor in a location where it can accurately sense outdoor temperature. 2. Route low voltage wire from outdoor sensor to electrical compartment: Outdoor sensor wire MUST NOT be combined with other control wiring in a multi-conductor cable. Seal external wall openings. Outdoor sensor lead can be extended to 250 ft. Unshielded Class II (thermostat) wire can be used provided it is segregated from any line voltage wiring. 3. Connect outdoor sensor wires to the two "OUTDOOR" positions of the low voltage terminal block. If connecting to the Steffes power line carrier system, follow the installation instructions in the PLC systems Owners and Installers Guide. J1 J2 J3 J4 The outdoor temperature sensor can be installed by wiring it directly to the system or to the Steffes power line carrier (PLC) system. Y1 9 LINE 1 To ensure proper operation and safety, all line voltage circuits must be segregated from low voltage wiring. LINE 1 Make proper field wiring connections, phasing circuits as shown. Reference the Unit Identification label for circuit information. LINE 2 2. LINE 2 Route all line voltage wires through knockout(s) and into electrical panel. LINE 1 1. To Service (Breaker) Panel WARNING 1. LOW VOLTAGE PEAK CONTROL CONNECTIONS NO When interfacing a heat pump with the Comfort Plus, the A-coil MUST be placed in the return air plenum. 7 NC AIR CONDITIONER/HEAT PUMP INTERFACE COM 6 To Control Board P9 C
