Mitsubishi Heavy Industries SRK25GZ-L1 Handbook page 905

19.5.6 Test run
(1) Before starting operation
(a) Measure resistances between the electrical parts terminal blook and ground grounded area using a 500V Megger, insulator.
Resistance must be higher than 1M Ω.
(b) Confirm whether the power source breaker (main switch) of the unit has been turned on for over 12 hours
to energize the crankcase heater in advance of operation.
(c) Make sure that the compressor bottom has been warmed.
(d) Be sure to fully open the service valves (on both the gas and liquid sides) of the outdoor unit. if being
operated without opening, the valve may be got out of order.
Note (1) When the service valve is closed, be sure to check that evacuation is completed or a refrigerant is charged.
(2) Test run
(a) If it is impossible, a test run of indoor units can be conducted by using the switches No.5 and No.6 of [SW-3] on the outdoor
unit circuit board irrespective of ON/OFF conditions of CnS and the remote controller.
No.5 of [SW3]
Test run (ON)
↑
↓
Normal (OFF)
No.6 of [SW3]
[Remark]
This operation has priority over other option commands with the center console.
At the time of trial operation, the maximum frequencies are follows. Protective devices are effectively controlled, and frequen-
cies are controlled to become smaller.
(3) Cooling test run operation (Cooling test run can be performed in winter.)
(a) Operating method
● In the normal cooling mode, while holding down the ∇ Temperature set" switch, press the "Set" switch.
● Setting temperature is changed at 5˚C and the cooling test run is operated for 30 minutes.
It stops after 30 minutes.
(b) During cooling test run operation
● If ON/OFF switch is pressed or a mode other than the cooling is selected by the "Mode" switch, the cooling test run
operation is released or returns to the specified operation mode.
● If the "Temperature set ∆ switch is pressed, the setting temperature changed at 18˚C and the cooling test run operation is
released but the cooling operation continues.
● It is effective when any switches other than the above are pressed.
(c) During the cooling test run operation, the setting temperature changes at 5˚C but any other control and protective functions are
operable just like in the normal operation.
● If any error occurs, the location of error is indicated on the remote controller display or with the condition of flashing of
inspection lamp (red) on the main unit controller. Remove the cause of trouble before starting operation again.
(4) Delivery
(a) Explain how to operate the indoor unit to your customer according to the accessory owner's manual.
(b) Persuade the customer not to turn off the power switch even if the unit is not used for along time. The air
conditioner can start operation any time when your customer want to heating or cooling his room. (The
bottom of the compressor is heated with the crank case heater, and compressor troubles can be pre-
vented when the cooling or heating season sets in.)
• All connected indoor units operate when the
switch is set to ON.
• Indoor units request the maximum frequency and
the outdoor unit operates with the maximum fre-
quency shown in the table below according to
requents from indoor units.
• Select cooling or heating according to input to
No.6 of [SW3].
• When No.5 of [SW3] is ON when No.6 of [SW3]
is set to ON, a cooling operation starts.
• When the switch is set to OFF, these units can be
operated with the remote controller or by exter-
nal input.
• When No.5 of [SW3] is on when No.6 of [SW3]
is set to OFF, a heating operation starts.
FDC-HKX
903