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• If the room temperature should continue to fall, circuit R and W
second-stage heat room thermostat. Circuit R-W
The completed circuit will energize supplemental electric heat. Units with a second
heater sequencer (HR
) can be connected with first sequencer (HR
2
mostat or connected to a third heating stage W
on the thermostat indicates when supplemental heat is being energized.
11.4 BLOWER TIME DEL Y (HE TING 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.
11.5 DEFROST (DEFROST HE T 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.
11.6 EMERGENCY HE T (HE TING HE T 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
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.
11.7 ROOM THERMOST T ( NTICIP TOR SETTING)
See instructions with outdoor section, condensing unit or heat pump for recommended
room thermostats.
• On units with one electric heat sequencer (HR
anticipator setting should be .16.
• On units with two electric heat sequencers (HR
heat anticipator setting should be .32 if both are connected to same stage on thermo-
stat. Setting should be .16 if (HR
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.
12.0 C LCUL TIONS
12.1 C LCUL TING TEMPER TURE RISE
• The formula for calculating air temperature rise for electric resistance heat is:
Temperature Rise °F =
Where: 3.16 = Constant, CFM = Airflow
12.2 C LCUL TING BTUH HE TING C P CITY
• The formula for calculating BTUH heating capacity for electric resistance heat is:
BTUH Heating = Watts x 3.412
Where: 1 kW = 1000 Watts, 3.412 = Btuh/Watt
energizes a heat sequencer (HR
2
on the thermostat sub-base. A light
2
and E on the thermostat sub-base so that the electric
2
) (see wiring diagram on unit), heat
1
& HR
) (see wiring diagram on unit),
1
2
& HR
) are connected to separate stages.
1
2
3.16 x Watts
CFM
is completed by the
2
).
1
) to W
on ther-
1
2
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