Instruction manual
g. W2T is input from thermostat signaling for supplemental or emergency heat.
h. W3 is input from outdoor thermostat. JW1 connects W3 to W2T as wired at factory. This input is used only if an outdoor thermostat
is required by local codes.
i. Y
0
is output from control board to energize outdoor unit (heat pump) contactor.
2. Jumper wires (JW1 and JW2)
a. JW1 connects W2T to W3 to limit staging of electric heat with use of an outdoor thermostat. See Table 6 for staging. PCB controls
staging to extent that this feature is unnecessary unless required by local codes or regulations.
b. Cutting JW2 sets the PCB in efficiency mode. With JW2 cut, there is no loss of performance due to reduced indoor blower speed when
heat pump is operating near balance point. This jumper may be required to be cut if selected cooling fan speed is same as required
minimum motor LO speed tap selection as listed in Table 2. With JW2 cut, fan terminal LO becomes a dummy terminal.
3. A fuse is used to protect low-voltage transformer and PCB.
4. AUX+ and AUX- are connections for air conditioning accessories (EAC, humidifier, etc.).
5. F1, F2, HI, and LO are connections for indoor fan.
6. The 9-pin receptacle connects heater package wiring harness.
7. SEC1 and SEC2 are used to connect secondary side of transformer to PCB. SEC1 is connected to equipment ground.
B. Transformer
The proper wiring of the transformer on the PCB is illustrated in Fig. 11.
NOTE: Terminals T1, T2 (if used), and T3 are wired to primary or high side of transformer. The 208-v terminal (or blue wire if the transformer
has primary leads) is used on T3 for 208-v applications. The 230-v terminal (or red wire) is used on T3 for 230-v applications. The T2 is a dummy
terminal.
C. Electric Heat
1. When thermostat calls for electric heat, 24-v signal is sent to PCB through W2T. PCB will energize first stage of electric heat.
2. First 2 stages will come on if W2T and Y are energized at same time. After each 10 minutes W2T is energized, another stage of electric
heat will energize.
3. As W2T is de-energized, electric heat will stage down in 8 minute steps with exception of first step. First step will be on only half as long
as it was prior to W2T de-energizing.
4. When W2T is energized by itself, JW1 is cut, and an outdoor thermostat is used and is open. Staging is limited as listed in Table 6.
5. When both W3 and W2T are energized without JW1 being cut, or with outdoor thermostat closed, system operation will stage heat up to
maximum level if signal is energized for proper amount of time.
6. If only W3 is energized, there is no effect on the PCB. No heat will be energized.
D. Accessories
Terminals AUX+ and AUX- are energized with 24vdc when fan is energized. The accessory kit Part No. KFAIR0101ACR is used to connect an
EAC or humidifier.
NOTE: Loads cannot be connected directly to AUX+ and AUX-. Use the specified kit only.
Table 6—Electric Heater Stage Limiting
HEATER PART NO.
STAGES (KW OPERATING)
W2T Only (JW1 cut) W2T and W3
Heater Stage 1 2 3 4
KFCEH0101H10 10 kw Non-Fused 3 6 9 9
KFCEH0201H15 15 kw Fused 3 8 11 15
KFCEH0301H20 20 kw Fused 5 10 15 20
Table 7—LED Flash Code
FLASH CONDITION INPUT SIGNAL PROBLEM INDICATION
NO LIGHT/FLASH — No Power or Board Failure
STEADY LIGHT — Board Failure
STEADY FLASH — Stand By Condition or Fan Only
1 FLASH Y only Heat Pump Only Operating
2 FLASHES Y and/or W2T Heat Pump Plus 1 Relay
3 FLASHES Y and/or W2T Heat Pump Plus 2 Relays
4 FLASHES Y and/or W2T Heat Pump Plus 3 Relays
5 FLASHES Y, O Cool Mode
6 FLASHES Y, W2D, and/or W2T Defrost Mode
7 FLASHES W2T Emergency Heat Mode
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