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6
6. Hold garden sprayer nozzle close to finned areas and apply
cleaner with a vertical, up-and-down motion. Avoid spraying
in horizontal pattern to minimize potential for fin damage.
7. Ensure cleaner thoroughly penetrates deep into finned
areas.
8. Interior and exterior finned areas must be thoroughly
cleaned.
9. Finned surfaces should remain wet with cleaning solution
for 10 minutes.
10. Ensure surfaces are not allowed to dry before rinsing.
Reapply cleaner as needed to ensure 10-minute saturation
is achieved.
11. Thoroughly rinse all surfaces with low velocity clean
water using downward rinsing motion of water spray noz-
zle. Protect fins from damage from the spray nozzle.
Evaporator Coil Metering Devices
These systems use thermal expansion valves (TXV).
Refrigerant System Pressure Access Ports
There are two access ports in each system - on the suction tube
near the compressor and on the discharge tube near the com-
pressor. These are brass fittings 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. 8.) This
Schrader valve is permanently assembled into the core body
and cannot be serviced separately. Replace the entire core body
if necessary. Service tools are available from RCD (P920-
0010) that allow the replacement of the Schrader valve core
without having to recover the entire system refrigerant charge.
Apply compressor refrigerant oil to the Schrader valve core’s
bottom O-ring. Install the fitting body with 96 ±10 in. lbs of
torque; do not over-tighten.
NOTE: The High Flow valve has a black plastic cap with a rubber
O-ring located inside the cap. This rubber O-ring must be in place
in the cap to prevent refrigerant leaks.
EXAMPLE:
Model 50LC*D26
Coil-Leaving Temperature . . . . . . . . . . . . . 85°F (29°C)
Discharge Pressure . . . . . . . . . . . . . . 340 psig (2344 kPa)
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
cylinders. 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 position (access valve at the top) when adding liquid
refrigerant for charging. For a cylinder without a dip tube, in-
vert the cylinder (access valve on the bottom) when adding liq-
uid 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. Admit liquid refrigerant into the system in the
discharge line when breaking refrigerant system vacuum while
the compressor is OFF. Only add refrigerant (liquid) into the
suction line while the compressor is operating. If adding refrig-
erant into the suction line, use a commercial metering/expan-
sion device at the gage manifold. Remove liquid from the cyl-
inder, 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
Amount of refrigerant charge is listed on the unit’s nameplate.
Refer to Carrier GTAC2-5 Charging, Recovery, Recycling and
Reclamation training manual and the following procedures.
Unit panels must be in place when unit is operating during the
charging procedure.
NO CHARGE
Use standard evacuating techniques. Evacuate system down to
500 microns and let set for 10 minutes to determine if system
has a refrigerant leak. If evacuation level raises to
1100 microns and stabilizes, the system has moisture in it and
should be dehydrated per GTAC2-5 recommends.
If system continues to rise above 1100 microns, the system has
a leak and should be pressurized and leak tested using appro-
priate techniques as explained in GTAC2-5. After evacuating
system, weigh in the specified amount of refrigerant as listed
on the unit rating plate.
Fig. 8 — CoreMax
1
Access Port Assembly
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)
Summary of Contents for 50LC 14
Page 26: ...26 Fig 34 50LC 14 26 Control Wiring Diagram...
Page 27: ...27 Fig 35 50LC 14 26 RTU Open Control Wiring Diagram...
Page 28: ...28 Fig 36 50LC 14 20 208 230V 3 Phase Power Wiring Diagram...
Page 29: ...29 Fig 37 50LC 24 26 208 230V 3 Phase Power Wiring Diagram...
Page 30: ...30 Fig 38 50LC 14 26 460V 575V 3 Phase Power Wiring Diagram...