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ACID TEST
If the existing system is being replaced because of a com-
pressor electrical failure, assume acid is in system. If sys-
tem is being replaced for any other reason, use an acid test
kit to determine acid level. If even low levels of acid are de-
tected, 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 suc-
tion line filter drier as soon as possible, with a maximum of
72 hours of operation.
Recommendation: Install a ball valve in the liquid line at the
filter drier location when installing a suction filter in the suc-
tion 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 tub-
ing if they were not replaced.
3. Remove the existing outdoor unit. Install the new out-
door unit according to these installation instructions.
4. Install the factory-supplied liquid-line filter drier at the
indoor coil just upstream of the TXV.
CHS-180-240-01SI Rev. A
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 an
R-410A system.
5. If required, install a 100% activated alumina suction
6. Evacuate and charge the system according to the
7. Operate the system for 10 hr. Monitor the pressure
Specifications subject to change without notice.
CAUTION
line filter drier at the outdoor unit.
instructions in this installation manual.
drop across the suction line filter drier. If pressure
drop exceeds 3 psig (21 kPa), 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 nec-
essary. Never leave suction-line filter drier in system
longer than 72 hours (actual time).
3
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