Hitachi RAM-35QH5, Service Manual

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OPERATION USING SERVICE SWITCH OF OUTDOOR UNIT
MODEL RAM-40QH5
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
(DC35V) C.D terminals. LD304 (outdoor communication error indicator) will display communication error by blinking once.
(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 THE OUTDOOR UNIT INDEPENDENTLY
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.
Apply vacuum and then
charge refrigerant of 300g.
Never operate continuously for 5
minutes or more.
Parts to be prepared
(1) Universal union
1/4 inch (6.35mm diameter)
3/8 inch (9.52mm 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
1. Connect pipe to high pressure and low pressure side service valves.
Connect large diameter and
small diameter side service
values of outdoor unit using
universal union and copper
pipe as shown on the right.
Service switch (Forced-cooling
operation starts by pressing for
1 second or more, and pressing
for 1 second or more again
stops operation.)