How To Operate The Outdoor Unit Independently - Hitachi RAM-40QH5 Service Manual

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.
(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

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.
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.
LD304 (outdoor communication error indicator) will display
(1) Universal union
(2) Copper pipe (1/4 inch and 3/8 inch)
(3) Lead wire for shorting
Never operate continuously for 5
minutes or more.
– 72 –
Service switch (Forced-cooling
operation starts by pressing for
1 second or more, and pressing
for 1 second or more again
stops operation.)
communication error by blinking once.
Parts to be prepared
1/4 inch (6.35mm diameter)
3/8 inch (9.52mm diameter)
Two wires of about 10 cm long
with alligator clip or IC clip