17
The defrost board is equipped with a 5 minute
Anti-Short Cycle Delay (ASCD). The compressor
will not turn on until the minimum 5 minute off
time is reached.
The control contains a forced - defrost feature,
which puts the system into defrost mode every 6
ours and 4 minutes, unless the coil temperature
is above 40
°
F.
The system can be manually put into a forced
defrost mode at any time by shorting the “TEST”
terminals on the demand defrost board together
for more than 9 seconds. The coil temperature
sensor does not need to be cold when the unit
is forced into defrost. After the “TEST” input is
removed, the defrost mode will terminate in 13.7
minutes or when the coil temperature is above
the terminate set-point or when the “Y” input is
removed, whichever occurs first.
field Installed Electric Heat — These Single
Package Heat Pumps are designed to allow
optional electric heat to be field installed as
required by the building’s particular heating load.
The options available for each unit are shown in
the heater kit installation instructions. As noted
in the instructions, a field installed circuit breaker
kit is available as a means of electrical discon-
nect for the unit.
Install the heater kits as directed by the installation
instructions that come as part of the heater kit.
Follow all cautions and warnings as directed.
Optional Outdoor Thermostat — An outdoor
thermostat can be installed in the field with
2-stage electric heat. To install the outdoor
thermostat, remove the orange wire from the
“E” terminal on the terminal block, and connect
to the outdoor thermostat. Connect the other
side of the outdoor thermostat to W2 from the
thermostat.
START UP AND SYSTEM CHECK
Pre-Start Check list
• Verify that the unit is level to allow proper
condensate drainage.
• Verify that there is free airflow to and from
the outdoor coil and that all clearance
requirements are met.
• Verify that the duct work is sealed to prevent
air leakage.
• Verify that the line voltage power leads are
securely connected and the unit is properly
grounded.
• Verify that the low voltage wires are securely
connected to the correct leads on the low
voltage terminal strip.
• Verify that all exterior panels are replaced
and securely fastened.
• Verify that the outdoor fan turns freely.
• Verify that the power supply branch circuit
overcurrent protection is sized properly.
• Verify that the thermostat is wired correctly.
The thermostat function switch should be
set to “Off’ and the thermostat fan switch
should be set to “Auto.”
Start-Up Procedure
Close all electrical disconnects to energize the
system.
Air Circulation — Leave the thermostat system
switch set to “Off” and set the thermostat fan
switch to “On.” The blower motor should run
continuously. Check for air delivery at the
register(s). Ensure that there are no obstructions
at the registers or in the duct work. Set thermostat
fan switch to “Auto.”
Short Cycle Protection — With the system
operating in cooling mode, note the temperature
setting of the thermostat and gradually raise the
set-point temperature until the unit de-energizes.
Immediately lower the set point temperature of
the thermostat to its original setting and verify
that the indoor blower is energized. Verify that
after approximately 5 minutes the compressor
and fan energize and that the temperature
of the discharge air is cooler than the room
temperature. This is available only for the single
phase models.
System Cooling
1. Set the thermostat system switch to “Cool”
and the thermostat fan switch to “Auto”.
Gradually lower the thermostat temperature
switch below room temperature and
observe that the blower, compressor, and
fan energize. Check that air cooler than
room temperature is being discharged
at the register. Listen for any unusual
noises.
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