Troy-Bilt MXZ-3A30NA ユーザーズマニュアル

8

Perform gas charge to unit.

1  Connect gas cylinder to the service port of stop valve.

2  Perform  air  purge  of  the  pipe  (or  hose)  coming  from  refrigerant  gas

cylinder.

3  Replenish specified amount of the refrigerant, while operating the air

conditioner for cooling.

In case of adding refrigerant, comply with the quantity specified for the

refrigerating cycle.

When charging the refrigerant system with additional refrigerant, be sure

to use liquid refrigerant. Adding gas refrigerant may change the composi-

tion of the refrigerant in the system and affect normal operation of the air

conditioner. Also, charge the system slowly, otherwise the compressor
will be locked.

To maintain the high pressure of the gas cylinder, warm the gas cylinder

with warm water [under 40°C (140°F)] during cold season. But never use

naked fire or steam.

A

B

C

D

Union

Stop valve

Liquid pipe

Union

Union

Union

Indoor

unit

Stop valve with

service port

Gas pipe

Refrigerant gas

cylinder
operating valve

(for R410A)

Gauge manifold

valve (for R410A)

Charge hose (for R410A)

Refrigerant gas cylinder
for R410A with siphon

Electronic scale for
refrigerant charging

Refrigerant (liquid)

Outdoor unit

(MXZ-4A36NA)

Service port cap
(Torque 13.7 to
17.7 N•m, 140 to
180 kgf•cm, 10 to
13

ft•lb)

Stop valve
for GAS

Stop valve cap
(Torque 19.6 to 29.4 N•m,
200 to 300 kgf•cm, 15 to

22 ft•lb)

Gauge manifold

valve (for R410A)

Compound pressure

gauge (for R410A)

–0.101MPa
[–760 mm Hg

(–30 in. Hg)]

Handle
Low

Handle High

Vacuum pump

(for R410A)

Charge hose

(for R410A)

*Close

*Open

Hexagonal wrench

*4 to 5 turns

Stop valve
for LIQUID

Pressure gauge

(for R410A)

Precautions when using
the control valve

When attaching the control valve to

the service port, valve core may de-

form or loosen if excess pressure is

applied. This may cause gas leak.

Service port

Charge hose

(for R410A)

Body

Close

Open

Control
valve

A

When attaching the control valve to
the service port, make sure that the
valve core is in closed position, and
then  tighten  part A.  Do  not  tighten

part A or turn the body when valve

core is in open position.

1) Remove service port cap of stop valve on the side of the outdoor unit

gas pipe. (The stop valve will not work in its initial state fresh out of the

factory, totally closed with cap on.)

2) Connect  gauge  manifold  valve  and  vacuum  pump  to  service  port  of

stop valve on the gas pipe side of the outdoor unit.

3) Run the vacuum pump. (Vacuumize for more than 15 minutes.)

4) Check the vacuum with gauge manifold valve, then close gauge mani-

fold valve, and stop the vacuum pump.

5) Leave as it is for one or two minutes. Make sure pointer gauge mani-

fold valve remains in the same position. Confirm that pressure gauge

shows –0.101 Mpa [Gauge] [–760 mm Hg (–30 in. Hg)].

6) Remove gauge manifold valve quickly from service port of stop valve.

7) After  refrigerant  pipes  are  connected  and  evacuated,  fully  open  all

stop valves on both sides of gas pipe and liquid pipe. Operating with-

out fully opening lowers the performance and this causes trouble.

8) Refer  to  1-4.,  and  charge  the  prescribed  amount  of  refrigerant  if

needed.  Be  sure  to  charge  slowly  with  liquid  refrigerant.  Otherwise,

composition of the refrigerant in the system may be changed and af-
fect performance of the air conditioner.

9) Tighten cap of service port to obtain the initial status.

10) Leak test

SG79Y871H02.indb   8

9/7/2007   1:09:42 PM