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INSTALLATION GUIDELINE
Replacement /Retrofit – R22 to Puron
®
Split system heat pumps are intended to be installed with
matching indoor sections only. The 38AUQ heat pump outdoor
units are matched only with same-size 40RUQ indoor sections.
Existing R-22 indoor coils cannot be converted to R-410A heat
pump duty. Only the existing refrigerant piping is a candidate
for retrofit use.
Acid test – If the existing system is being replaced because of a
compressor electrical failure, assume acid is in system. If
system is being replaced for any other reason, use an approved
acid test kit to determine acid level. If even low levels of acid
are detected, install a 100 percent activated alumina suction
line filter drier in addition to the replacement liquid-line filter
drier. Operate this system in COOLING ONLY. Remove the
suction line filter drier as soon as possible, with a maximum of
72 hr of operation.
Recommendation: Install a ball valve in the liquid line at the
filter drier location when installing a suction filter in the suction
line.
Installation –
1. Remove the existing evaporator coil or fan coil and install
the replacement coil.
2. Drain oil from low points and traps in suction line tubing
if they were not replaced.
3. Remove the existing outdoor unit. Install the new outdoor
unit according to these installation instructions.
4. Install the factory-supplied liquid-line filter drier at the in-
door coil just upstream of the TXV.
5. If required, install a 100% activated alumina suction line
filter drier at the outdoor unit.
6. Evacuate and charge the system according to the instruc-
tions in this installation manual.
7. Operate the system for 10 hr. Monitor the pressure drop
across the suction line filter drier. If pressure drop ex-
ceeds 3 psig (21kPa), replace suction-line and liquid-line
filter driers. Be sure to purge system with dry nitrogen
and evacuate when replacing filter driers. Continue to
monitor the pressure drop across suction-line filter drier.
Repeat filter changes is necessary. Never leave suction-
line filter drier in system longer than 72 hr (actual time).
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could cause personal injury
or death.
Before performing service or maintenance operations on
unit, always turn off main power switch to unit and install
lockout tag. Unit may have more than one power switch.
UNIT OPERATION AND SAFETY HAZARD
Failure to follow this warning could cause personal injury,
death and/or equipment damage.
Puron® (R-410A) refrigerant systems operate at higher
pressures than standard R-22 systems. Do not use R-22
service equipment or components on Puron refrigerant
equipment.
PERSONAL INJURY AND ENVIRONMENTAL
HAZARD
Failure to follow this warning could cause personal injury
or death.
Relieve pressure and recover all refrigerant before system
repair or final unit disposal.
Wear safety glasses and gloves when handling refrigerants.
Keep torches and other ignition sources away from
refrigerants and oils.
CUT HAZARD
Failure to follow this caution may result in personal injury.
Sheet metal parts may have sharp edges or burrs. Use care
and wear appropriate protective clothing, safety glasses and
gloves when handling parts and servicing 38AUQ units.
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
Never install suction-line filter drier in the liquid-line of a
Puron
®
system.