17
START UP & ADJUSTMENTS
Pre-Start Check List
√
Verify the unit is level and allows proper condensate drainage.
√
Verify all clearance requirements are met and there is free
airflow to and from the outdoor coil.
√
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 gas line service pressure does not exceed
10.0 inches WC (0.36 psig), and is not less than 4.5 inches
WC (0.16 psig) for natural gas. For LP gas the line service
pressure must not exceed 14 inches WC (0.51 psig) and
must not be less than 11.0 inches WC (0.40 psig).
√
Verify that the flame roll-out control is closed. If necessary,
press the red button to reset the control.
DO NOT
install a
jumper wire across the control to defeat its function. If the
control reopens upon start-up,
DO NOT
reset the control
without identifying and correcting the fault condition which
caused the control to trip.
√
Verify that the gas line has been purged and all connections
are leak tight.
√
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
WARNING:
If this unit is equipped with crankcase heaters, allow
24 hrs for heating of the refrigerant compressor
crankcase prior to start up and anytime the power
has been removed for more than 12 hrs. Failure to
comply may result in damage or cause premature
failure of the system.
• Check all electrical wiring for loose connections and tighten
as required.
• Check unit for return air filters and condensate trap.
• Close all electrical disconnects to energize the system.
Air Circulation
Leave the thermostat system mode on OFF and set the fan mode
to ON. Blower will 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 will stop running.
System Cooling
1. Set the thermostat’s system mode to COOL and the fan
mode to AUTO. Lower the thermostat temperature setpoint
one degree below room temperature and verify the outdoor
unit and blower energize on 1st stage cool.
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. Once determining the system is operating properly, after
1-2 minutes lower the thermostat temperature set point an
additional 3-4 degrees until the cooling system moves into
2nd stage or high cool operating mode. The compressor and
indoor blower will increase in speed.
4. 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 in approximately 60
seconds, unless the fan switch is set to the ON position.
System Heating
1. Set the thermostat to the lowest setting.
2. Follow the procedures given on the operating instruction
label, in this installation instructions or attached inside the
louvered control access panel.
3. Set the thermostat one degree above room temperature and
verify the sequence of operation. See Operating Sequence
section on
.
4. Verify that the compressor and outdoor fan motor are not
energized.
5. After determining the system to be operating properly, (1-2
minutes) raise the thermostat temperature set point an
additional 3-4 degrees until the heating system moves into
2nd stage or high heat operating mode. The gas valve will
energize to high heat mode while the induced draft motor
and indoor blower motor both increase in speed.
6. After the unit has run for approximately five minutes, set the
thermostat below room temperature. Verify the shutdown
sequence; steps 10 -12 in the Operating Sequence section
on
Verifying & Adjusting Temperature Rise
Verify the temperature rise through the unit is within the range
specified on the unit data label for both high and low firing rates.
Temperature rises outside the specified range could result in
premature heat exchanger failure.
1. Place thermometers in the return and supply air stream as
close to the unit as possible. The thermometer on the supply
air side must be shielded against direct radiation from the
heat exchanger to avoid false readings.
2. Adjust all registers and duct dampers to the desired position.
Run the unit for 10 to 15 minutes before taking any temperature
readings. The temperature rise is the difference between the
supply and return air temperatures.
NOTE:
For typical duct systems, the temperature rise will fall
within the range specified on the data label (with the blower
speed at the factory recommended setting) shown in
. If the measured temperature rise falls outside
the specified range, it may be necessary to change the blower
speed. Lowering the blower speed increases the temperature
rise and a higher speed decreases the temperature rise.
The unit is equipped with a variable speed motor. Heating and
cooling speed selection is made by changing the tap settings
on the ignition control board located in the unit control box.
Refer to Configuring the Variable Speed Blower Section (
The Variable Speed Blower (VSB) is designed with built in delay
profiles for start up and shut down of the system. Refer to the
Operating Sequence section (
) for more details.
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