Refrigerant Charging
The system refrigerant charge can be checked and adjusted through the service ports provided at the front panel of the outdoor unit.Use only gauge lines which have a Schrader depression device present to actuate the valve.
Air Circulation
Running the Blower Continuously
Set the thermostat’s system mode to OFF and the thermostat’s fan mode 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 ducts.
Selecting continuous low speed fan operation (Standard Blower)
The air handler is equipped with an option of continuous low speed fan operation. When G is energized without Y/ Y2, the air handler will operate using the cooling speed. With G & Y/Y2 or Y/Y2 energized, the air handler will operate in the selected cooling speed (including 40 sec
Turning the Blower Off
Set thermostat’s fan mode to AUTO, the blower will shut down immediately.
System Cooling
1.Set the thermostat’s system mode to COOL and fan mode to AUTO. Lower the thermostat’s temperature mode below room temperature and observe that the blower energizes. Check the air being discharged at the register is cooler than room temperature. Verify unit refrigerant pressures are in order. Blower should be turning in direction indicated by arrow.
NOTE: DO NOT alter unit wiring. Listen for any unusual noises. Locate the source and correct as needed.
2.Allow the unit to run for several minutes and then set the thermostat’s temperature above room temperature. Verify the blower cycles off with the thermostat.
System Heating
1.Set the thermostat’s system mode to HEAT and the fan mode to AUTO. Increase the thermostat’s temperature above room temperature and observe that the blower energizes.Check the air being discharged at the register is warmer than room temperature.
2.Allow the unit to run for several minutes and then set the thermostat’s temperature below room temperature. Verify the blower cycles off with the thermostat.
Selecting Minimum Electric Heat Airflow
The minimum electric heat airflow setting controls the minimum air flow that will be produced whenever electric heater kits are used. When the electric heater kit is energized along with a heat pump, the airflow may be higher depending on the basic
automatically set the heating speed based on the amount of installed heat.The remaining 3 HEAT switches have no function. Switch settings are listed in Table 6 (page 20) or Table 9 (page 22). NOTE: For HMG**X1E Models, the minimum electric heat airflow setting may be set higher, but must never be set lower than the setting shown in Table 7 (page 21).
Blower Configurations
Determining Nominal System Capacity
To select the appropriate airflows for the air handler, the nominal system capacity must be known. The nominal system capacity is always the nominal capacity of the outdoor unit. However, in some situations the nominal system capacity may not be the same as the nominal capacity of the air handler. Always refer to the nominal capacity of the outdoor unit to determine the nominal system capacity.
NOTE: The CFM values listed in Table 9 (page 22) are not dependent on duct static pressure. The VSHE motor automatically compensates for changes in duct static pressure (within the limits of the motor).
3-Speed Units
The blower speed is preset at the factory for operation at the same speed for heating and cooling, by using the jumping terminal on the blower motor and connecting it to the desired speed with both the red and black wires connected to the jumping terminal. NOTE: The control board is programmed with a 40 second off delay in the cooling mode for optimum system performance and efficiency.
CAUTION:
To avoid personal injury or property damage, make sure the motor leads do not come into contact with any uninsulated metal components of the unit.
For optimum system performance and comfort, it may be necessary to change the factory set speed. See Table 5 (page 19) for airflow data. To change the blower speed:
1.Disconnect all electrical power to the unit and remove the upper door.
2.Remove the black and red wires from the blower motor jumping terminal. Discard the blower motor jumping terminal.
3.Connect the heating speed wire (red) and the cooling speed wire (black) to the desired blower speed marked on the terminal block of the blower motor.
•Terminal 4 = Hi speed
•Terminal 5 = Med speed
•Terminal 6 = Low speed
14