GSZH5 Service Manual
97
SERVICING
container or drum in liquid form due to its fractionation
before entering the system. There is commercially
charging hose set to accomplish this. DO NOT charge
liquid R410A into the compressor.
units containing ECM motors before the power is
applied to the indoor unit. Sending a low voltage signal
without high voltage power present at the outdoor unit
can cause malfunction of the control module on the
ECM motor.
Adequate refrigerant charge for the matching evaporator
coil or air handler and 15 feet of line set is supplied with the
condensing unit. If using evaporator coils or air handlers
other than HSVTC coil it may be necessary to add or
remove refrigerant to attain proper charge. If line set
exceeds 15 feet in length, refrigerant should be added at .6
ounces per foot of liquid line.
or higher when charging the unit. Charge should
equipped indoor coil to verify proper charge.
When opening valves with retainers, open each valve
avoid loss of refrigerant, DO NOT apply pressure to the
retainer. When opening valves without a retainer remove
service valve cap and insert a hex wrench into the valve
stem and back out the stem by turning the hex wrench
counterclockwise. Open the valve until it contacts the rolled
lip of the valve body.
necessary to force the stem tightly against the rolled
lip.
Break vacuum by fully opening liquid service valve.
After the refrigerant charge has bled into the system,
open the suction service valve. The service valve cap is
the secondary seal for the valves and must be properly
tightened to prevent leaks. Make sure cap is clean and
apply refrigerant oil to threads and sealing surface on
HSVTC evaporator coil or air handler and 15 feet of line
set is supplied with the outdoor unit.
EXPANSION VALVE SYSTEM
non-adjustable TXV should be charged by subcooling
only.
refrigerant charge is within limits. Charge the unit on
low stage.
Final Charge Adjustment
1. Total static pressure is .5” WC or less.
2.
3.
Sheet for Indoor Unit.
4. Complete charging information are in Service Manual
RS6200006.
until indoor ambient conditions have stabilized.
depending on indoor
run the unit in cooling for 10-15 minutes or until
refrigerant pressures stabilize. Use the following
ensure that the refrigerant charge is within limits.
Units matched with indoor coils equipped with a non-
adjustable TXV should be charged by Subcooling only.
Superheat on indoor coils with adjustable TXV valves are
factory set and no adjustment is normally required during
startup. Only in unique applications due to refrigerant
and outdoor unit and refrigerant tubing sizes or poor
performance should Superheat setting require adjustment.
These adjustments should only be performed by
adjustments refer to the appropriate Service Manual.
Units Equipped with Adjustable Expansion Valves
should be charged by Subcooling and Superheat
adjusted only if necessary.
1. Purge gauge lines. Connect service gauge manifold to
base-valve service ports. Run the system in low stage
at least 10 minutes to allow pressure to stabilize.
2. Temporarily install a thermometer on the liquid
line at the liquid line service valve and 4-6” from
the compressor on the suction line. Ensure the
thermometer makes adequate contact and is insulated