17
9. Attach the equalizer tube to the suction line. If the
replacement TXV has a flare nut on its equalizer line,
use a tubing cutter to remove the mechanical flare nut
from the equalizer. Then use a coupling to braze the
equalizer line to the stub (previous equalizer line) in
the suction line.
10. Attach the TXV bulb in the same location as the orig-
inal (in the sensing bulb indent), wrap the bulb in pro-
tective insulation and secure using the supplied bulb
clamp. See Figs. 20 and 21.
DIRECTION OF
REFRIGERANT FLOW
EQUALIZER TUBE
FROM TXV VALVE
CAPILLARY TUBE
TO TXV
15.9 mm
(REF)
TXV SENSOR BULB
SENSOR BULB
INDENT
SENSOR BULB
INSULATION
C10372
Fig. 20
−
TVX Sensor Valve Insulation
11. Route the equalizer tube through the suction connec-
tion opening (large hole) in the fitting panel and in-
stall the fitting panel in place.
12. Sweat the inlet of the TXV marked “IN” to the liquid
line. Avoid excessive heat which could damage the
valve.
13.
Check for leaks.
14.
Evacuate the system completely and then recharge.
15.
Remove the lockout/tagout on the main power switch
and restore power to the unit.
16.
Complete the charging procedure.
Refrigerant System Pressure Access Ports
There are two access ports in the system: 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. See Fig. 14.
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. 14. 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 of torque; do not over-
tighten.
TXV SENSOR
BULB
CLAMP
CIRCUIT 1
CIRCUIT 2
TXV
(CIRCUIT 2)
TXV
(CIRCUIT 1)
TXV SENSOR
BULBS
TXV
SENSOR
BULBS
C12557
Fig. 21
−
TVX Sensor Bulb Locations
Summary of Contents for 581J-17-28
Page 73: ...73 APPENDIX IV WIRING DIAGRAMS cont C160042 Fig 72 581J D17 D28 Power Diagram 208 230 3 60 ...
Page 74: ...74 APPENDIX IV WIRING DIAGRAMS cont C160043 Fig 73 581J D17 D28 Power Diagram 460 3 60 ...
Page 75: ...75 APPENDIX IV WIRING DIAGRAMS cont C160044 Fig 74 581J D17 D28 Power Diagram 575 3 60 ...
Page 80: ...80 APPENDIX IV WIRING DIAGRAMS cont C160049 Fig 79 RTU OPEN Wiring Diagram ...
