Installation and Operation Manual -
HRG18xxS1P
Page 18 of 23
508133M01
Issue 2106
4. The unit will display the unit type for 10 seconds. Press
the push button and hold it for 3 seconds for the unit
to store the unit type. Once, the unit code is stored
the system acknowledges by displaying a string of
characters ending with the updated system unit code.
After programming of unit type is complete, the unit can be
set up for charge mode operation.
Charge Mode Jumper
To initiate the HRG18 Charge Mode function, install the
jumper across the two Charge Mode Pins (CHRG MODE)
on the outdoor control. The Charge Mode can be used
when charging the system with refrigerant, checking
the refrigerant charge, pumping down the system and
performing other service procedures that requires outdoor
unit operation at 100% capacity.
HRG18
Charge Mode Operation with a Conventional
24VAC Non-Communicating Heat Pump Thermostat
Charge Mode Jumper Operation in the Cooling Mode
On applications with a conventional 24VAC non-
communicating heat pump thermostat, the charge mode
jumper must be installed on the Charge Mode Pins after
providing a cooling compressor demand to the HRG18
and an “O” cooling reversing valve demand to initiate the
Charge Mode. A cooling blower demand must also be
provided to initiate blower in high stage operation on the
indoor unit.
The compressor and outdoor fan motor will begin to ramp
up and reach 100% design capacity within 3 minutes. They
will continue to operate at 100% design capacity for the
duration of charge mode.
Charge Mode Jumper Operation in the Heat Pump
Heating Mode
On applications with a conventional 24VAC non-
communicating heat pump thermostat, the charge mode
jumper must be installed on the Charge Mode Pins after
providing a heating compressor demand to the HRG18
without an “O” reversing valve signal to initiate the Charge
Mode. A heating blower demand must also be provided to
initiate high speed blower operation on the indoor unit.
The compressor and outdoor fan motor will begin to ramp
up and reach 100% design capacity within 3 minutes. They
will continue to operate at 100% design capacity for the
duration of charge mode.
Exiting Charge Mode
To exit the charging mode, remove the Charge Mode
Jumper from the Charge Mode Pins. The system will
be in Charge Mode for a maximum time of 60 minutes
and will automatically exit the charge mode and resume
normal operation after 60 minutes even if the charge mode
jumper is left in place. To extend the charge mode beyond
Start-Up
If unit is equipped with a crankcase heater, it should
be energized 24 hours before unit start-up to prevent
compressor damage as a result of slugging.
CAUTION
1. Rotate fan to check for frozen bearings or binding.
2.
Inspect all factory and field-installed wiring for loose
connections.
3. After evacuation is complete, open liquid line and
suction line service valves to release refrigerant
charge (contained in outdoor unit) into system.
4.
Replace the stem caps and secure finger tight, then
tighten an additional 1/6 of a turn.
5. Check voltage supply at the disconnect switch. The
voltage must be within the range listed on the unit
nameplate. If not, do not start equipment until the
power company has been consulted and the voltage
condition corrected.
6. Set thermostat for cooling demand, turn on power to
indoor blower, and close the outdoor unit disconnect
switch to start the unit.
7. Recheck unit voltage with unit running. Power must be
within range shown on unit nameplate.
Refrigerant Charging
Excessive amounts of liquid refrigerant entering the
suction line can damage the compressor. When adding
refrigerant, precautions must be taken to control the
flow of liquid into the system. This can be done by using
a liquid vaporizing adapter or manual control using a
sight glass as indicator.
CAUTION
Units are factory charged with the amount of R-410A
refrigerant indicated on the unit rating plate. This charge is
based on a matching indoor coil and outdoor coil with 15’
line set. For varying lengths of line set, refer to Table 7 for
refrigerant charge adjustment. A blank space is provided
on the unit rating plate to list the actual field charge.
60 minutes, ensure the cooling/heating demand, blower
demand and appropriate reversing valve demand are
available and reapply the charge mode jumper.
NOTE:
If compressor demand is lost during charge mode
period, then the compressor and fan will cease to operate,
and the unit will enter into a delay timer for 3 minutes.
Repeat the charging mode procedure to get back into
charge mode.
