9.3 HEATING (HEAT PUMP)
• When the thermostat “calls for heat,” the circuits between R and B, R and Y and R
and G are completed. Circuit R and B energizes the reversing valve (RV) switching it
to the heating position (remains energized as long as selector switch is in “heat” posi-
tion). Circuit R and Y energizes the contactor (CC) starting the outdoor fan motor
(OFM) and compressor (COMP). Circuit R and G energizes the blower relay (BR)
starting the indoor blower motor (IBM).
• If the room temperature should continue to fall, circuit R and W
2
is completed by the
second-stage heat room thermostat. Circuit R-W
2
energizes a heat sequencer (HR
1
).
The completed circuit will energize supplemental electric heat. Units with a second
heater sequencer (HR
2
) can be connected with first sequencer (HR
1
) to W
2
on ther-
mostat or connected to a third heating stage W
2
on the thermostat sub-base. A light
on the thermostat indicates when supplemental heat is being energized.
9.4 BLOWER TIME DELAY (HEATING OR COOLING)
• All models are equipped with a blower time delay (BTD) in lieu of a blower relay (BR)
(see wiring diagram). The blower will run for 30 seconds after the blower time delay
(BTD) is de-energized.
9.5 DEFROST (DEFROST HEAT CONTROL)
• For sequence of operation for defrost controls, see outdoor heat pump installation
instructions.
• Supplemental heat during defrost can be provided by connecting the purple (PU) pig-
tail in the outdoor unit to the W on the thermostat. This will complete the circuit
between R and W through a set of contacts in the defrost relay (DR) when the out-
door heat pump is in defrost. This circuit, if connected, will help prevent cold air from
being discharged from the indoor unit during defrost.
• For most economical operation, if cold air is not of concern during defrost, the purple
wire can be left disconnected. Supplemental heat will then come on only when called
for by second stage room thermostat.
9.6 EMERGENCY HEAT (HEATING HEAT PUMP)
• If selector switch on thermostat is set to the emergency heat position, the heat pump
will be locked out of the heating circuit, and all heating will be electric heat. Jumper
should be placed between W
2
and E on the thermostat sub-base so that the electric
heat control will transfer to the first stage heat on the thermostat. This will allow the
indoor blower to cycle on and off with the electric heat when the fan switch is in the
auto position.
9.7 ROOM THERMOSTAT (ANTICIPATOR SETTING)
See instructions with outdoor section, condensing unit or heat pump for recommended
room thermostats.
• On units with one electric heat sequencer (HR
1
) (see wiring diagram on unit), heat
anticipator setting should be .16.
• On units with two electric heat sequencers (HR
1
& HR
2
) (see wiring diagram on unit),
heat anticipator setting should be .32 if both are connected to same stage on thermo-
stat. Setting should be .16 if (HR
1
& HR
2
) are connected to separate stages.
NOTE:
Some thermostats contain a fixed, non-adjustable heat anticipator. Adjustment
is not permitted.
• The thermostat should be mounted 4 to 5 feet above the floor on an inside wall of the
living room or a hallway that has good air circulation from the other rooms being con-
trolled by the thermostat. It is essential that there be free air circulation at the location
of the same average temperature as other rooms being controlled. Movement of air
should not be obstructed by furniture, doors, draperies, etc. The thermostat should
not be mounted where it will be affected by drafts, hot or cold water pipes or air ducts
in walls, radiant heat from fireplace, lamps, the sun, T.V. or an outside wall. See
instruction sheet packaged with thermostat for mounting and installation instructions.
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