Carrier 48HC D17 Series Service And Maintenance Instructions page 19

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 TXV bulb in the same location as the original
(in the sensing bulb indent), wrap the bulb in protect-
ive insulation and secure using the supplied bulb
clamp. See Fig. 22.
CAPILLARY TUBE
TXV SENSOR BULB
SENSOR BULB
INDENT
DIRECTION OF
REFRIGERANT FLOW
SENSOR BULB
INSULATION
Fig. 22 - - TXV Sensor Valve Insulation
11. Route equalizer tube through suction connection
opening (large hole) in fitting panel and install fitting
panel in place.
12. Sweat the inlet of TXV marked "IN" to the liquid
line. Avoid excessive heat which could damage the
TXV valve.
TXV SENSOR
BULBS
CIRCUIT 2
EQUALIZER TUBE
FROM TXV VALVE
TO TXV
15.9 mm
(REF)
C12556
CLAMP
Fig. 23 - - TXV Sensor Bulb Locations
13. Check for leaks.
14. Evacuate system completely and then recharge.
15. Remove lockout/tagout on main power switch and
restore power to unit.
16. Complete 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.
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
overtighten.
TXV SENSOR
BULB
TXV
(CIRCUIT 2)
TXV
(CIRCUIT 1)
19
TXV
SENSOR
BULBS
CIRCUIT 1
C12557