Switch And Led - Panasonic 2WAY Multi Technical & Service Manual

(2) Switch and LED

S004, S005, S006, S007 (HOME, UP, DOWN, SET)
● These switches are used to perform7-segment LED service display changes and type settings.
● These key switches are used to determine (maintain operation of) various items, raise and lower items being
displayed, etc.
S001 (All stop switch)
● This switch is used to terminate all the units at the same time.
● Moving this switch to the "Stop" side executes all units to stop, and is thus used during maintenance and
other occasions when it is necessary to have the units not operate.
● The switch is set to "STOP" at the factory before shipment, and thus needs to be switched to the "NORM"
side for test run.
● For W MULTI system
For W MULTI system, total off can be set to each outdoor unit individually. (Outdoor units without total off
set operate as outdoor units with CCU function.)
Caution:
Because outdoor units set to total off have their valves opened, if other outdoor units are operated this
way, refrigerant will fl ow to the outdoor units with total off set, causing malfunction. Therefore, be sure
to close the valves of refrigerant gas tube, refrigerant liquid tube, and balance tube of the outdoor units set
to total off. If all outdoor units of the system are set to total off, then there is no need to close the shutoff
valves.
Use the following procedure to turn off circuit breaker of one or more outdoor units and perform maintenance.
1. For one unit, set the STOP switch the "STOP" side. ("  " appears.)
2. After approximately 3 minutes, "  " appears. (*2) Then, turn off the circuit breaker of the
outdoor unit.
3. Close the valves of refrigerant gas tube, refrigerant liquid tube, and balance tube.
4. After the work is fi nished, open the closed valves of refrigerant gas tube, refrigerant liquid tube, and
balance tube.
5. Set the STOP switch to the "NORM" side, and then turn on the circuit breaker.
6. When all outdoor units are in complete combustion state and until vane comes out (about the time when
all outdoor units simultaneously continue operation for one minute or more)
7. For the next targeted outdoor unit, perform the procedure starting from step 1.
S002 (Fuel gas solenoid forced off switch)
● This switch is provided for the forced shutdown of the gas solenoid valve.
● Moving this switch to the "OFF" side causes the forced shutdown of the gas solenoid valve. However, when
cranking is carried out with the gas valve closed, it immediately stops at "A07". Therefore, when measuring
engine compression or for other purposes, use "GASOFF" (fuel gas solenoid valve forced closing setting) of
test run and forced setting function "No. 4 TEST".
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