Hitachi RAM-60QH4 Manuel De Service page 130

Operation using service switch of outdoor unit
[RAM-60QH4]
1.
Turn OFF power switch, then turn ON again.
2.
Remove electrical parts box lid.
3.
Press service switch for 1 second or more. (waiting at least 20 seconds after power switch is turned on.)
At this time, LD303 (red) lights and unit operates in forced cooling mode.
Never operate
continuously for 5
minutes or more.
(Note)
(1) When checking is performed using service switch of outdoor unit, if both indoor units are not connected to interface signal
(DC 35V) C, D terminals,
(2) If operating is performed with compressor connector disconnected, LD301 will blink 4 times and operation will not start.
After operation using service switch is completed, turn the power switch OFF and then ON again.
How to operate outdoor unit independently
1. Connect pipe to high pressure and low pressure side service valves.
Connect large diameter and
small diameter side service
valves of outdoor unit using
universal union and copper
pipe as shown on the right.
Apply vacuum and then
charge refrigerant of 300g.
Operation method is the same as that for operation using service switch of outdoor unit described above. However, interface
signal communication error (no input at C, D terminals) will be displayed when operation is complete.
Open upper lid.
Electrical parts
box lid
LD304 (outdoor communication error indicator) will display
Outdoor unit
For outdoor
Compressor
unit
Reversing
valve
For indoor unit
SMOOTHING CAPACITOR
SWITCHING POWER P.W.B.
REACTOR
SELF-DIAGNOSIS LAMPS
Large diameter side
service valve
Universal union
(1/4 inch and 3/8 inch)
( ← )
Close
Copper pipe
(1/4 inch)
Small diameter side
service valve
( ← )
Close
– 142 –
Service switch (Forced-cooling
operation starts by pressing for
1 second or more, and pressing
for 1 second or more again
stops operation.)
SPM(SYSTEM POWER MODULE)
DIODE STACK
SERVICE SWITCH
CONTROL P.W.B.
communication error by blinking once.
Parts to be prepared
(1) Universal union
1/4 inch (6.35 mm diameter)
3/8 inch (9.52 mm diameter)
(2) Copper pipe (1/4 inch and 3/8 inch)
(3) Lead wire for shorting
Two wires of about 10 cm long with
alligator clip or IC clip
Never operate continuously for 5
minutes or more.
2P TERMINAL
BOARD
2P TERMINAL BOARD
(2 pcs.)