Carrier 38AUZ User Manual download pdf (Page 2)

INSTALLATION GUIDELINE

Replacement /Retrofit – R22 to Puron

Replacement/retrofit installations require change-out of

outdoor unit, metering device, and filter driers. Change-out of

indoor coil (evaporator) and interconnecting tubing is

recommended.

Existing evaporator coil – If the existing evaporator coil may

be re-used, check with the coil manufacturer to verify the coil

construction is suitable for operation with the higher pressures

of Puron

(R-410A). Also determine if the existing TXV valve

is compatible with R-410A, replace if necessary. The minimum

factory test pressure rating must be 250 psig (1725 kPa).

Existing coil will need to be purged with Nitrogen to remove as

much mineral oil as possible to eliminate cross contamination

of oils.

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. 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 when appropriate.

2. Drain oil from low points and traps in suction line tubing

(and hot gas bypass tubing if appropriate) and evaporator

if they were not replaced. Removing oil from evaporator

coil may require purging of the tubing with dry nitrogen.

3. Unless indoor unit is equipped with a Puron® approved

metering device, change the metering device to a thermal

expansion valve (TXV) designed for Puron® (R-410A).

4. Remove the existing outdoor unit. Install the new outdoor

unit according to these installation instructions.

5. Install a new field-supplied liquid-line filter drier at the

indoor coil just upstream of the TXV or fix orifice

metering device.

6. If a suction line filter drier is also to be installed, install

suction line drier downstream of suction line service

valve at condensing unit.

7. If required, install a 100% activated alumina suction line

filter drier at the outdoor unit.

8. Evacuate and charge the system according to the

instructions in this installation manual.

9. Operate the system for 10 hr. Monitor the pressure drop

across the suction line filter drier. If pressure drop

exceeds 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 38AU 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.

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Carrier 38AUZ User Manual Page 2

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