38
Compressor Oil —
EQUIPMENT DAMAGE HAZARD
Failure to follow this caution may result in damage to
equipment.
The compressor i n a Puron system uses a polyolester
(POE) oil. T his oil is extremely hygroscopic, meaning
it absorbs water readily. POE oils can absorb 15 times
as much water as other oils designed for HCFC and
CFC refrigerants. Take all necessary precautions to
avoid exposure of the oil to the a tmosphere.
CAUTION
!
Servicing Sys tems on Roofs W ith Synthetic Materials —
POE (polyolester) compressor lubricants are known to cause
long ter m damage to so me s yn thetic roofin g materials .
Exposure, even if immediately cleaned up, may cause
embrittlement (leading to cracking ) to occur in one year or
more. When performing any serv ice which may risk
exposure of compressor oil to the roof, take appropriate
precautio n s to protect roofin g. Proced u res w hich ris k oil
leakage include but are not limited to compress o r
replacement, repairin g r efr iger an ts leaks , rep lacing
refrigerant components such as filter drier, pressu re switch,
metering device, coil, accumulator, or reversin g valve.
Synthetic Roof Precautionary Procedure:
1. Cover extended roof working area with an imper-
meable polyethylene (plastic) drop cloth or tarp.
Cover an approximate 10 x 10 ft (3.3 x 3.3 m) area.
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 sh op tow el ins ide unit immediately un-
der component(s) to be serviced and prevent lubricant
run-offs through the louvered openings in the base pan.
4. Perform required service.
5. Remove and di spose of any oil contaminated material
per local codes.
Liquid Line Filter Drier —
The factory-provided 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 38 and
42). 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 remove d and
re-installed, tighten to 2-3 in-lbs (23-34 N-cm).
Factory High-Flow Access Ports —
There are two additional access ports in the system - on
the suction tube between the compressor and the suction
service valve and on the li quid tube near the liquid servic e
valve (see Figs 39 and 43). These are brass fittings with
black plastic caps. The hose connection fittings are
standard
-in 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. 35) This check valve is permanently assembled into
this c ore body and cannot be servi ced separately; replace
the entire core body if necessary. Service tools are
available from RCD that allow the replacement of the
chec k valve core without having to recover the entire
system refrigerant charge. Apply compressor refrigerant
oil to the che ck 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. 35 -- CoreMax Access Port Assembly
38AU
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