Carrier 42/38KCJ024713 Technical & Service Manual page 19

a. Only the correctly installing of indoor and outdoor unit done, can the refrigerant
pipe be connected.
b. The cut-off valves are completely close before ex-work. Before connecting the
refrigerant pipe, be careful to check whether the valves are completely close.
c. The connecting procedure of refrigerant pipe: first, unscrew the two valves on the
outdoor unit and the pipe-jointing nut on the indoor unit(please keep them care
fully). Please connect the refrigerant pipe according to the manual, the
pipe-jointing nut should be screw tightly and no leakage. Note: you need two
wrenches to make balance.
d. When the connecting of refrigerant pipe is finished, before power on the system,
you should vacuum the indoor unit through the maintenance port on the cut-off
valves, or open the high-pressure valve, and exhaust the air through the
maintenance port on the low-pressure valve(closed). It will take about ten
seconds. Then screw tightly the maintenance port.
refrigerant, fill through the maintenance port of the low-pressure valves on the
outdoor unit ).
e. Open all the valves completely before power on the system, or it will be sick for
low efficiency.
f. Gas leak check. Make sure no gas from connections with leak detector or soap
water.
6.3.2.2 Using bronze pipe selling in market
Completely shut the cut-off valves of the outdoor unit (as ex-work status). After the
refrigerant pipe has been connected with both the indoor and outdoor unit, let the air
exhaust out from the maintenance gap on he low-pressure cut-off valves of the
outdoor unit. Screw the nuts tightly on the maintenance gap after the air has been
drained.
6.3.2.3 To make the refrigerant pipe unblocked completely
you should keep the cut-off valves of the outdoor unit completely open after you have
finished
the above steps (step1) or step 2))
Note: Before screwing the reamer nut, smear the pipe and the connecting surface with
refrigerant oil; Check and make sure there is no leakage by soap-water or
leakage-checker after connecting;
Be sure the connecting joint on the indoor side is insulated.
Use two wrenches to connecting the pipes.
Tubing Torque
size
9.52 3270~3990N.cm(333~407kgf.cm)
12.7 4950~6030N.cm(504~616kgf.cm)
(When supplement the
17
Installation detail