Sequence Of Operation - International comfort products PH55 Series Installation Instructions Manual

3. Inspect the inside of the unit to be sure that all wires are in
place and all tools, etc. are removed.
4. Replace all service access panels.
Check the unit's operation as outlined in the following instruc-
tions. If any unusual sparking, odors or noises are encountered,
shut OFF electric power immediately. Recheck for wiring errors,
or obstructions in or near blower motors.
Auxiliary Heating
NOTE: Repeat circulating air blower procedure above if Auxiliary
Electric Heat is being installed after unit has been installed and
checked out.
Temperature Rise Check
Temperature rise is the difference between the supply and return
air temperatures. The temperature rise should be ± 2°F (1.1°C) of
the temperature rise shown in NO TAG .
NOTE: The temperature rise can be adjusted by changing the
heating speed tap at the unit's blower terminal block. Refer to the
unit's Installation Instructions for airflow information.
A temperature rise greater than 60°F (33.3°C) is not recom-
mended. (This applies to electric heat only).
1. To check the temperature rise through the unit, place ther-
mometers in the supply and return air ducts as close to the
unit as possible.
2. Open ALL registers and duct dampers.
3. Set thermostat Heat--Cool selector to HEAT.
4. Set the thermostat temperature setting as high as it will go.
5. Turn electric power ON.
6. Operate unit AT LEAST 5 minutes, then check temperature
rise.
NOTE: The maximum outlet air temperature for all models is
200°F (93.35C). Maximum temperature rise for electric heat is
60°F (33.35C)
If temperature rise is excessive, verify proper airflow through the
unit. If temperature rise is inadequate, check for proper electrical
supply to the heater and verify correct airflow.
7. Set thermostat to normal temperature setting.
8. Turn electric power OFF.
9. Change blower speed tap if 60°F (33.3°C) Temperature Rise was
exceeded and repeat.
10.Be sure to seal all holes in ducts if any were created during
this process.
Defrost Control Time Interval Adjustment
Electrical shock hazard.
Turn OFF electric power supply at disconnect switch
or service panel before removing any access or ser-
vice panel from unit.
Failure to follow this warning can result in property
damage, personal injury, and/or death.
To adjust defrost interval:
1. Turn off all power to Heat Pump.
2. Remove control box cover.
3. Locate electronic defrost control board.
4. The Defrost Control Board has a jumper plug that can be
set at 30, 60, 90 or TEST. Remove the plug and insert on
the appropriate 2 pins indicated by ñ on the board.
FIGURE 16 Defrost Control Board Jumper Plugs

9. Sequence of Operation

NOTE: If power to the unit has been interrupted, there will be a 3
minute delay before the compressor starts.
Cooling Mode: Energized (R,G,Y, O)
(N/A)
(a) When high and low voltage have been applied to unit
for more than 3 minutes:
(1)On a call for cooling.........:
The compressor and condenser fan will energize. The evap-
orator blower motor will have a delay on and will energize
after 30 seconds.
(2)When the cooling setpoint has been satisfied.........:
The compressor and condenser fan will de--energize immedi-
ately. The evaporator blower motor will have a delay off and
will de--energize after 30 seconds.
Heat Mode (Heat Pump Only): Energized (R,G,Y)
De- -energized (O)
(a) When high and low voltage have been applied to unit
for more than 3 minutes:
(1) On a call for heating.........:
The compressor and condenser fan will energize. The in-
door blower motor will have a delay on and will energize af-
ter 30 seconds.
10
Jumper Plugs
De- -energized
427 01 1005 00