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Figure10
TypicalThermostatConnections
THERMOSTAT FURNACE AIR CONDITIONER
24 VAC HOT D
24 VAC COM D
HEAT STAGE 1
COOL STAGE 1
INDOOR FAN D
- - .
--171
- -D -
-4B
-D
...... i
i
A
(c)
i
THERMOSTAT
24 MAC HOT D
24 MAC COM D
HEAT STAGE 1
COOL STAGE 1
INDOOR FAN D
- - °
FAN COIL
--F_
- -D -
-4B
--_-
-D
AIR CONDITIONER
...... i
i
(c)
I
..... •1
THERMOSTAT
24 MAC HOT D
24 MAC COM D
HEAT STAGE 1
COOL STAGE 1
INDOOR FAN D
FAN COIL
.... D
.... D _
_ . _ _ -
AC with Comfort Alert
.... D
.... D
START-UP PROCEDURE
,
2.
3.
4.
5.
Set indoor thermostat selector switch to OFF.
Turn ON all electrical disconnect devices.
If unit has a crankcase heater, energize the heater
and wait 24 hours before proceeding.
Set indoor thermostat at desired temperature. Be
sure setpoint is below indoor ambient temperature
or thermostat will not call for cooling.
Set indoor thermostat selector switch to COOL.
Operate unit for minimum 15 minutes, then check
the system refrigerant charge.
REFRIGERANT CHARGE
Factory charge amount and desired subcooling are
shown on unit rating plate. Charging method is shown on
information plate inside unit.
For TXV, use subcooling method.
For Piston, use superheat method.
To properly check or adjust charge, conditions must be
favorable for subcooling or superheat charging.
Favorable conditions exist when the outdoor
temperature is between 70°F and 100°F (21°C and
38 °C), and the indoor temperature is between 70°F and
80°F (21°C and 27°C). Follow the procedure below.
Unit is factory charged for 15 feet (4.6 m) of lineset.
Adjust charge by adding or removing 0.6 oz/ft (17 g/mm)
of 3/8 liquid line above or below 15 feet (4.6 m)
respectively.
For standard refrigerant line lengths 80 feet (24.4 m) or
less, allow system to operate in cooling mode at least 15
minutes. If conditions are favorable, check system
charge by super heat method for fixed metering device
and subcooling method for TXV. If any adjustment is
necessary, adjust charge slowly and allow system to
operate for 15 minutes to stabilize before declaring a
properly charged system.
421 01 5103 02 specificationssubjecttochangewithout notice. 9
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