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2. Cover area in front of the unit service panel with a

terry cloth shop towel to absorb lubricant spills and

prevent run-offs, and protect drop cloth from tears

caused by tools or components.

3. Place terry cloth shop towel inside unit immediately

under component(s) to be serviced and prevent lubric-

ant run-offs through the louvered openings in the base

pan.

4. Perform required service.

5. Remove and dispose of any oil contaminated material

per local codes.

Liquid Line Filter Drier —

The factory-provided reversible filter drier is specifically

designed to operate with Puron®. Replace the filter drier

with factory-authorized components only with a filter

drier with desiccant made from 100% molecular sieve

grade XH-11. Filter drier must be replaced whenever the

refrigerant system is opened.

When removing a filter drier, use a tubing cutter to cut the

drier from the system. Do not unsweat a filter drier from

the system. Heat from unsweating will release moisture

and contaminants from drier into system.

Field Refrigerant Access Ports —

Field service access to refrigerant pressures is through the

access ports located at the service valves (see Figs 25 and

27). These ports are

-in SAE Flare couplings with

Schrader check valves and service caps. Use these ports to

admit nitrogen to the field tubing during brazing, to

evacuate the tubing and evaporator coil, to admit initial

refrigerant charge into the low-side of the system and

when checking and adjusting the system refrigerant

charge. When service activities are completed, ensure the

service caps are in place and secure; check for leaks. If

the Schrader check valve must be removed and

re-installed, tighten to 2-3 in-lbs (23-34 N-cm).

Outdoor Coil Metering Devices —

The metering devices are multiple fixed–bore devices

(Acutrol™) swaged into the horizontal outlet tubes from

the liquid header, located at the entrance to each

evaporator coil circuit path. These are non–adjustable.

Service requires replacing the entire liquid header

assembly.

To check the indoor coil, disconnect the supply fan signal

(A04-A06 direct-drive fans) or contactor (IFC) coil, then

start the circuit in a Cooling Mode (jumper R to Y1 or

Y2) and observe the frosting pattern on the face of the

indoor coil. A frost pattern should develop uniformly

across the face of the indoor coil starting at each tube at

the Acutrol nipple locations.

To check the outdoor coil, disconnect the outdoor fan

motor. Start the circuit in a Heating Mode (jumper R to

W1 or W2) and observe the frost pattern on the face of the

outdoor coil.

Failure to develop frost at an outlet tube can indicate a

plugged or a missing orifice.

Refrigerant System Pressure Access Ports —

There are two access ports in each circuit - on the suction

tube near the compressor and on the discharge tube near

the compressor. These are brass fittings with black plastic

caps. The hose connection fittings are standard 1/4 SAE

Male Flare couplings.

The brass fittings are two-piece High Flow valves, with a

receptacle base brazed to the tubing and an integral

spring-closed check valve core screwed into the base. (See

Fig. 21.) This check valve is permanently assembled into

this core body and cannot be serviced separately; replace

the entire core body if necessary. Service tools are

available from RCD that allow the replacement of the

check valve core without having to recover the entire

system refrigerant charge. Apply compressor refrigerant

oil to the check valve core’s bottom o-ring. Install the

fitting body with 96 ±10 in-lbs (1085 ±23 N--cm) of

torque; do not overtighten.

1/2-20 UNF RH

30°

0.596

.47

5/8” HEX

SEAT

CORE

WASHER

DEPRESSOR PER ARI 720

+.01/-.035

FROM FACE OF BODY

7/16-20 UNF RH

O-RING

45°

1/2" HEX

This surface provides a metal to metal seal when

torqued into the seat. Appropriate handling is

required to not scratch or dent the surface.

(Part No. EC39EZ067)

C08453

Fig. 21 -- CoreMax Access Port Assembly

38AUQ

1 2 ... 21 22 23 24 25 26 27 28 29 30 31 ... 47 48

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