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ELECTRICAL CONNECTION TO THE FURNACE WARNING Never connect a 120-volt AC circuit to the terminals of the furnace interlock (standard wiring). Only use the low voltage class 2 circuit of the furnace blower control. 0 ! For a furnace connected to a cooling system: On some older thermostats, energizing the «R» and «G» terminals at the furnace has the effect of energizing «Y» at the thermostat and thereby turning on the cooling system. If you identify this type of thermostat, you must use the ALTERNATE FURNACE INTERLOCK WIRING. STANDARD FURNACE INTERLOCK WIRING ALTERNATE FURNACE INTERLOCK WIRING W R G Y W R G C Y UNIT TERMINAL CONNECTOR THERMOSTAT TERMINALS FOUR WIRES TWO WIRES heating only FURNACE 24-VOLT TERMINAL BLOCK TWO WIRES NO C NC I OC OL Y R G B W R G Y W R G Y C THERMOST nuts wiring 4 WIRES 2 WIRES heating only FURNACE 24-VOLT TERMINAL BLOCK 2 WIRES UNIT TERMINAL CONNECTOR NO C NC I OC OL Y R G B COOLING SYSTEM COOLING SYSTEM VE0108A - 19 WIRING DIAGRAM LOGIC DIAGRAM 120 V, 60Hz120V, 60HzLine Neutral Field wiringremote control(see notes 3 & 4) 120 V, 60 Hz W1 J5J7J6J4 ELECTRONICASSEMBLY 1231212123 1234 1 2 1 2 3 4 5 12345 J8J9 J11 J10 12 J12 J13 J1410987654321 B 24 Vclass 29.5 Vclass 2 CPU K2K4K5 J5-2J10-1J10-2 Line voltage factory wiringClass 2 low voltage factory wiringClass 2 low voltage field wiring See note 1 120 V90 V68 Vneutral Door interlock switch(magnetically actuated Exhaust fanmotor 12345 12 1 2 J3 J2 J1 t° Damper motorBK OverrideswitchFurnace blower interlockJ14-1 : NOJ14-2 : COMJ14-3 : nc(optional; see notes 3, 5)DAMPERELECTRONIC ASSEMBLY Defrosttemperature sensor Exhaust fan motorSupply fan motorJ5-1J5-3J7-2J7-1J4-1J4-3J6-2J6-1 K1K3 K2 24 Vclass 29.5 Vclass 2 120 V90 V68 Vneutral J9-1J9-2J9-3 J4-2 J9-4 Exhaust fan motorcapacitorSupply fan motorcapacitor J8-1J8-2J8-4J8-5 K4 J12-2J12-1 A1 Damper motorJ3-2J3-1 J2-2J2-1 F1 J12-5J12-4J12-3 J2-3J2-4J2-5 Door interlock switchJ11-2J11-1 K1K3 K5 J14-3J14-1J14-2 Furnaceblowerinterlock(optional; seenotes 3, 5) J14-4J14-5J14-6J14-7J14-8J14-9J14-10 Overrideswitch(optional; seenotes 3, 4)Field wiringremotecontrol (seenotes 3, 4) ICP nc BK YRG W W BKWBLR G BK BL BNBN BKBKBKBKBK BL Exhaust fanmotorcapacitorSupply fanmotorcapacitorSupply fanmotor G GBNBN Y YBK W A2 A2 M3T1 S1 R1 A1 F1 M1C1C2M2 (optional; seenotes 3 & 4) VE0130A NOTES1. For continued fire protection. Use specified UL listed/Certified line fuse.2. If any of the original wire, as supplied, must use the same equivalent wire.3. Field wiring must comply with applicable ordinances and regulations.4. Remote controls (class 2 circuit) see instruction manual. COLOR CODEBK BLACK BL BLUE BN BROWN G GREEN R RED W WHITE Y YELLOWnc no connection 5. Furnace fan circuit must be Critical characteristic. 6. To obtain medium speed, interchangeBLUE and RED transformer The medium speed See note 6reed switch) - 20 6. WIRING DIAGRAM WARNING ! Risk of electrical shocks. Before performing any maintenance or servicing, always disconnect the unit from its power source. 7. BALANCING THE UNIT To avoid balancing, the difference between stale air ducts total lenght and fresh air ducts total lenght must not exceed 50 ft. However, even if the stale air ducts and fresh air ducts lenghts are almost equal, your local building codes may require balancing the unit. If the unit does not need to be balanced, shut all the pressure taps (located on the unit door) with the small plastic plugs included in the hardware kit. 7.1 WHAT YOU NEED TO BALANCE THE UNIT • A magnehelic gauge capable of measuring 0 to 0.5 inch of water (0 to 125 Pa) and 2 plastic tubes. • The balancing chart located on the unit door. 7.2 PRELIMINARY STAGES TO BALANCE THE UNIT VP0009 • Seal all the unit ductwork with tape. Close all windows and doors. • Turn off all exhaust devices such as range hood, dryer and bathroom fans. • Make sure the integrated balancing dampers are fully open. Turn the thumb screw (A ) clockwise to manually open the dampers. Both are located on the Exhaust air to outside port and on Fresh air to building port. • Make sure all filters are clean (if it is not the first time you balance the unit). VJ0032 A Port with integrated balancing damper - Top view 7.3 BALANCING PROCEDURE 1. Set the unit to high speed. Make sure that the furnace/air handler blower is ON if the installation is in any way connected to the ductwork of the cold air return. If not, leave furnace/air handler blower OFF. If the outside temperature is below 0°C / 32°F, make sure the unit is not running in defrost while balancing. (By waiting 10 minutes after plugging the unit in, you are assured that the unit is not in a defrost cycle.). 2. Place the magnehelic gauge on a level surface and adjust it to zero. 3. Connect tubing from gauge to EXHAUST air flow pressure taps (see diagram beside). Be sure to connect the tubes to their appropriate high/low fittings. If the gauge drops below zero, reverse the tubing connections. NOTE: It is suggested to start with the exhaust air ...

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