Installation, Operation and Maintenance Manual
C13-Series
20
Subject to change without notice.
10.20-IM (0818)
Heat Pump Heating Sequence Of
Operation
INFORMATION
NOTE: Confirm that a heat pump thermo-
stat has been used for this application�
CAUTION
Supplemental heat is recommended with
all heat pump configurations.
1�
Before starting the unit, make sure electrical power
has been turned on for a minimum of 24 hours� This
assures that any liquid refrigerant is “driven” out of the
crankcase�
2�
For water-cooled units, make sure condenser water is
available� Open all shut off valves and make sure all
air is purged from the water circuit� Verify that cooling
tower is functioning, if this is the source of condensing
water supply� Start circulating the water to the water
condenser�
3�
The following sequence is based on the unit being
controlled by a room thermostat� If another control type
is being utilized, reference to the instructions for that
device may be required�
a�
Lower thermostat setpoint to the lowest level�
b�
Set System switch to “OFF” position�
c�
Set Fan switch to “AUTO” position�
d�
Moving the Fan switch to the “ON” position should
cause the evaporator blower motor to run� Moving
the Fan switch back to “AUTO” should stop the
blower�
e�
Move the System switch to the “HEAT” position�
Slowly raise the thermostat setting to call for
heating� The evaporator blower should start
(assumes Fan switch set to “AUTO”) and the
System No� 1 compressor will start�
f�
On those units with multiple compressors, if the
thermostat setpoint continues to be raised, the
second compressor should then start�
g�
Set room thermostat at desired space temperature�
Set the Fan switch to “AUTO” or “ON”� The unit will
cycle as required to maintain conditions�
Options
Condensate Pump
If an optional condensate pump is to be used it will be
mounted external to the unit� The pump incorporates
mounting tabs for securing the pump in a suitable location�
If the unit is an air source heat pump the unit drains from the
evaporator and the condensing section will both have to go
into the pump�
INFORMATION
NOTE: The condensate lines out of the
unit, both evaporator and condenser,
need to be trapped before going into the
condensate pump�
Insert the condensate line(s) through one of the drain inlet
holes of the pump sump� Make sure the condensate line
does not interfere with the float. Cut an angle on the inlet
tube so that it does not close off against the bottom of the
pump (See Figure 11)�
The pump has a built in check valve. Use 3/8" ID flexible
plastic tubing from the pump to a suitable discharge location�
Care should be taken not to kink the tubing as this will impede
the flow of condensate out of the pump. Support the tubing
as necessary with suitable clamps�
Do not exceed the maximum lift of the pump which is 18
feet (35 GPH at 18´)� Provide an inverted “U” trap at the
highest point of the tubing (See Figure 14)� Slope the
discharge tubing downward to a point below the bottom of
the condensate pump�
The condensate pump has a grounded plug with a 6´ cord�
Plug the condensate pump into a 115 volt outlet�
Connect the low voltage leads of the auxiliary safety switch
to the thermostat control circuit as shown on the unit wiring
diagram� This will disrupt / shut down the unit operation until
the cause of the high water condition can be rectified. In
some situations an alarm (field supplied) should also be
activated dependent upon the application�
Содержание C13-Series
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