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14
Fig. 18 — CoreMax
1
Access Port Assembly
Refrigerant System Pressure Access Ports
There are two access ports in each circuit - on the suction tube
and the discharge tube near the compressor. These are brass fit-
tings with black plastic caps. The hose connection fittings are
standard
1
/
4
-in. SAE male flare couplings.
The brass fittings are two-piece High Flow valves, with a re-
ceptacle base brazed to the tubing and an integral spring-closed
check valve core screwed into the base. See Fig. 18. This check
valve is permanently assembled into this core body and cannot
be serviced separately. Replace the entire core body if neces-
sary. Service tools are available from RCD that allow the re-
placement of the check valve core without having to recover
the entire system refrigerant charge. Apply compressor refrig-
erant oil to the check valve core’s bottom O-ring. Install the fit-
ting body and torque to 96 ±10 in. lb (10.9 ± 1 Nm). Do not ex-
ceed 106 in. lb (11.9 Nm) when tightening.
PURON
®
(R-410A) REFRIGERANT
This unit is designed for use with Puron (R-410A) refrigerant.
Do not use any other refrigerant in this system.
Puron (R-410A) refrigerant is provided in pink (rose) colored cyl-
inders. These cylinders are available with and without dip tubes;
cylinders with dip tubes will have a label indicating this feature.
For a cylinder with a dip tube, place the cylinder in the upright po-
sition (access valve at the top) when removing liquid refrigerant
for charging. For a cylinder without a dip tube, invert the cylinder
(access valve on the bottom) when removing liquid refrigerant.
Because Puron (R-410A) refrigerant is a blend, it is strongly
recommended that refrigerant always be removed from the cyl-
inder as a liquid. Add liquid refrigerant into the system in the
discharge line. If adding refrigerant into the suction line, use a
commercial metering/expansion device at the gage manifold;
remove liquid from the cylinder, pass it through the metering
device at the gage set and then pass it into the suction line as a
vapor. Do not remove Puron (R-410A) refrigerant from the
cylinder as a vapor.
Refrigerant Charge
The amount of refrigerant charge is listed on the unit’s name-
plate. Refer to Carrier Publication,
GTAC2-5 Charging, Recov-
ery, Recycling and Reclamation Training Manual
and the fol-
lowing procedures:
Unit panels must be in place when unit is operating during the
charging procedure. If unit is equipped with a head pressure con-
trol device, bypass it to ensure full fan operation during charging.
Charge checking and adjustments must be made while the sys-
tem is operating in Cooling only.
NO CHARGE:
Use standard evacuation techniques for Puron (R-410A) refrig-
erant. After evacuating system, weigh the specified amount of
refrigerant.
COOLING CHARGING CHARTS
How To Use Cooling Charging Charts
Take the outdoor ambient temperature and read the suction
pressure gage. Refer to chart to determine what suction tem-
perature should be. If suction temperature is high, add refriger-
ant. If suction temperature is low, carefully recover some of the
charge. Recheck the suction pressure as charge is adjusted.
Example:
Model 50KCQ*A04
Outdoor Temperature . . . . . . . . . . . . . . . . . . . . . . . 85°F (29°C)
Suction Pressure. . . . . . . . . . . . . . . . . . . . . .140 psig (965 kPa)
Suction Temperature . . . . . . . . . . . . . . . . . . . . . . . 55°F (13°C)
Refer to Fig. 19-21 for cooling charging charts.
Compressors
LUBRICATION
Compressors are charged with the correct amount of oil at the
factory.
1. CoreMax is a registered trademark of Fastest, Inc.
5/8
” HEX
0.47
3
0°
0.596
1/2-20 UNF RH
1/2
” HEX
45°
WA
S
HER
O-RING
7/16-20 UNF RH
DEPRE
SS
OR PER AHRI 720
+.01/-.0
3
5
FROM FACE OF BODY
Thi
s
su
rf
a
ce provide
s
a
met
a
l to met
a
l
s
e
a
l when
torq
u
ed into the
s
e
a
t. Appropri
a
te h
a
ndling i
s
req
u
ired to not
s
cr
a
tch or dent the
su
rf
a
ce.
S
EAT
CORE
(P
a
rt No. EC
3
9EZ067)
SIZE DESIGNATION
NOMINAL TONS REFERENCE
A04
3
A05
4
A06
5
CAUTION
UNIT DAMAGE HAZARD
Failure to follow this caution can result in damage to
components.
The compressor is in a Puron
®
(R-410A) refrigerant system and
uses a polyolester (POE) oil. This 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. Avoid exposure of POE oil to the atmosphere. This
exposure to the atmosphere can cause contaminants that are
harmful to R-410A components to form. Keep POE oil
containers closed until ready for use.
Summary of Contents for WeatherMaker 50KCQ A04 Series
Page 34: ...34 Fig 53 RTU Open Overlay for Economizer Wiring ...
Page 35: ...35 Fig 54 VFD Overlay for W2770 Controller Wiring ...
Page 70: ...70 Fig C 50KCQ A04 A05 A06 Control Wiring Diagram 575 3 60 APPENDIX D WIRING DIAGRAMS ...
Page 71: ...71 Fig D 50KCQ A04 A05 A06 Power Wiring Diagram 208 230 1 60 APPENDIX D WIRING DIAGRAMS ...
Page 72: ...72 Fig E 50KCQ A04 A05 A06 Power Wiring Diagram 208 230 3 60 APPENDIX D WIRING DIAGRAMS ...
Page 73: ...73 Fig F 50KCQ A04 A05 A06 Power Wiring Diagram 460 3 60 APPENDIX D WIRING DIAGRAMS ...
Page 74: ...74 Fig G 50KCQ A04 A05 A06 Power Wiring Diagram 575 3 60 APPENDIX D WIRING DIAGRAMS ...
Page 75: ...75 Fig H 50KCQ Premier Link Control Diagram APPENDIX D WIRING DIAGRAMS ...
Page 76: ...76 Fig I 50KCQ RTU Open Control Diagram APPENDIX D WIRING DIAGRAMS ...