10
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
W1
terminal on the
terminal block, and connect to the outdoor thermostat.
Connect the other side of the outdoor thermostat to
W2
from the thermostat.
optional electric Heater kits
This packaged air conditioner is designed to allow optional
electric heat to be field installed as required by the
building’s particular heating load.
Optional field-installed
electric heater kits are available in 5 kw to 20 kw heating
capacities for single phase, and 9 kw to 15 kw heating
capacities for three phase. Installation instructions for
the electric heaters and their application are shipped
separately with the heater kits. Part numbers for available
heater kits are listed in the installation instructions supplied
with the heater kit.
note:
All temperature rise data shown in
was calculated using 10kW heaters. For other sized
heater kits, use the following steps to determine the heat
rise for your particular heater kit.
1. Determine the CFM by locating your blower motor tap
.
2. Locate your heater kits kW value and Btu/h in
3. Input the values into the following equation:
temp rise:
Δ
t= (btu/h)/(cFM*1.08)
note:
Generally the heat rise should be 30 - 40 degrees.
Anything above 40 degrees should be avoided.
If electric heat is installed, a single-stage or two- stage
heating thermostat will be required depending on the heater
kit. Install the heater kits as directed by the instructions
supplied with the heater kit. Follow all cautions and
warnings as directed.
Start uP & SYSteM cHeck
Pre-Start check list
√
Verify the unit is level and allows condensate to drain.
√
Verify the outdoor coil and top of the unit are free from
obstructions and debris, and all equipment access/
control panels are in place.
√
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 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 system mode should be set to OFF and the
thermostat fan mode should be set to AUTO.
Start-up Procedure
Warning:
if the unit is equipped with a crankcase heater,
allow 24 hours prior to continuing the start up
procedures to allow for heating of the refrigerant
compressor crankcase. Failure to comply may
result in damage and could cause premature
failure of the system. this warning should be
followed at initial start up and any time the power
has been removed for 12 hours or longer.
Air Circulation
Leave the thermostat system mode on OFF, and set the
fan mode to ON. Blower should run continuously. Check
the air delivery at the supply registers and adjust register
openings for balanced air distribution. Examine ductwork
for leaks or obstruction if insufficient air is detected. Set
the thermostat fan mode to AUTO. The blower should
stop running.
System Cooling
1. Set the thermostat’s system mode to COOL and the
fan mode to AUTO. Gradually lower the thermostats
setpoint below room temperature and verify the outdoor
unit and indoor blower energize.
2. Feel the air being circulated by the indoor blower and
verify that it is cooler than ambient temperature. Listen for
any unusual noises. If unusual sounds occur, determine
the source of the noise and correct as necessary.
3. Allow the cooling system to operate for several minutes
and then set the temperature selector above room
temperature. Verify the fan and compressor cycle off
with the thermostat.
note:
The blower should also
stop unless fan mode is set to ON.
System Heating
If the unit has been equipped with optional electric heater
kits, set the thermostat's system mode to HEAT and the
fan mode to AUTO. Verify the compressor and outdoor
fan are not energized but that the blower and heaters are.
Feel the air being circulated by the indoor blower and verify
that it is warmer than ambient temperature. Listen for any
unusual noises. If unusual sounds occur, determine the
source of the noise and correct as necessary.
