Installation Manual

8
3. Condenser Motor - This item is activated by the contactor
during heating and cooling, except during defrost and
emergency heat operation.
4. Compressor - This item is activated by the contactor for
heating and cooling, except during emergency heat. It is
protected by an internal overload.
5. Contactor Relay - This control is activated by the
thermostat (24V coil) and supplies power to the contactor.
6. Defrost Control - The Defrost control provides time/
temperature initiation and termination of the defrost cycle.
When a Defrost cycle is initiated, the defrost control shifts
the reversing valve to “cooling” mode, stops the outdoor
fan and brings on supplemental heat. Normally, a Defrost
cycle will take only 2-3 minutes unless system is low on
charge or outdoor conditions are severe. (Windy and cold)
7. Outdoor Thermostat - These optional controls are used
to prevent full electric heater operation at varying outdoor
ambient (0° F-to 45° F). They are normally open above
their set points and closed below to permit staging of
indoor supplement heater operation. If the outdoor ambient
temperature is below 0° F (-18° C) with 50% or higher RH,
an outdoor thermostat (OT) must be installed and set at
(0°) on the dial. Failure to comply with this requirement
may result in damage to the product which may not be
covered by the manufacturer’s warranty.
8. Reversing Valve Coil - This coil is activated by the
thermostat, in the cooling mode and during defrost. It
positions the reversing valve pilot valve for cooling
operation.
9. Indoor Blower Motor
This item is activated by the room thermostat
by COOLING/HEATING or FAN ON position. The motor is
energized through the EBTDR for PSC motors.
Units with X-13 Motors Only
The X-13 model indoor blower motor is activated by the
room thermostat by COOLING/HEATING or FAN ON
position. The motor is energized by a 24 volt control signal
(from thermostat Y, G or W) for X-13 motors. X-13 motors
are constant torque motors with very low power
consumption.
E
V
A
P
O
R
A
T
O
R
COOLING
SERVICE VALVE
SERVICE PORT
REVERSING VALVE
C
O
N
D
E
N
S
E
R
SERVICE PORT
COMPRESSOR
SERVICE PORT
ACCUMULATOR
EXPANSION DEVICE
CHECK VALVE
ORIFICE
SERVICE
VALVE
CHECK VALVE
ORIFICE
INDOOR
COIL
DISTRIBUTOR
OUTDOOR
COIL
E
V
A
P
O
R
A
T
O
R
HEATING
SERVICE VALVE
SERVICE PORT
REVERSING VALVE
C
O
N
D
E
N
S
E
R
COMPRESSOR
SERVICE PORT
ACCUMULATOR
CHECK VALVE
ORIFICE
SERVICE
VALVE
CHECK VALVE
ORIFICE
INDOOR
COIL
DISTRIBUTOR
OUTDOOR
COIL
DISTRIBUTOR
HEAT PUMP REFRIGERANT CIRCUIT - FIGURE 7