Test Run; Special Functions - Mitsubishi Electric PUD-SWM Series Installation Manual

9. Test run

9.1. Before test run
► After completing installation and the wiring and piping of the indoor and
outdoor units, check for refrigerant leakage, looseness in the power supply
or control wiring, wrong polarity, and no disconnection of one phase in the
supply.
► Use a 500-volt megohmmeter to check that the resistance between the
power supply terminals and ground is at least 1 MΩ.
► Do not carry out this test on the control wiring (low voltage circuit) termi-
nals.
en
WARNING:
Do not use the outdoor unit if the insulation resistance
is less than 1 MΩ.
Insulation resistance
After installation or after the power source to the unit has been cut for an extended
period, the insulation resistance will drop below 1 MΩ due to refrigerant accumulat-
ing in the compressor. This is not a malfunction. Perform the following procedures.
1. Remove the wires from the compressor and measure the insulation resistance of
the compressor.
2. If the insulation resistance is below 1 MΩ, the compressor is faulty or the resist-
ance dropped due the accumulation of refrigerant in the compressor.
3. After connecting the wires to the compressor, the compressor will start to warm
up after power is supplied. After supplying power for the times indicated below,
measure the insulation resistance again.
9.2. Test run
9.2.1. Indoor unit DipSW setting
Check that the Dip SW2-4 on the control board of the indoor unit is OFF. This outdoor unit will not work in cooling mode.
9.2.2. Using remote controller
Refer to the indoor unit installation manual.
Note :
Occasionally, vapor that is made by the defrost operation may seem as if smoke come up from the outdoor unit.

10. Special Functions

A
X
F
SW1
B
A Circuit diagram example
(low noise mode)
B On-site arrangement
C External input adapter
(PAC-SC36NA-E)
X: Relay
A
X Y
F
SW2
SW3
B
A Circuit diagram example
(Demand function)
B On-site arrangement
X, Y: Relay
15
C D
CNDM
Orange
X
Brown
Red
Fig. 10-1
E
D Outdoor unit control board
E Max. 10 m
F Power supply for relay
C D
CNDM
Orange
X
Brown
Red
Y
Fig. 10-2
E
C External input adapter
(PAC-SC36NA-E)
D Outdoor unit control board
E Max. 10 m
F Power supply for relay
• The insulation resistance drops due to accumulation of refrigerant in the com-
pressor. The resistance will rise above 1 MΩ after the compressor is warmed
up for 4 hours.
(The time necessary to warm up the compressor varies according to atmos-
pheric conditions and refrigerant accumulation.)
• To operate the compressor with refrigerant accumulated in the compressor,
the compressor must be warmed up at least 12 hours to prevent breakdown.
4. If the insulation resistance rises above 1 MΩ, the compressor is not faulty.
CAUTION:
• The compressor will not operate unless the power
supply phase connection is correct.
• Turn on the power at least 12 hours before starting
operation.
- Starting operation immediately after turning on the main power switch can result
in severe damage to internal parts. Keep the power switch turned on during the
operational season.
► The followings must be checked as well.
• The outdoor unit is not faulty. LED1 and LED2 on the control board of the outdoor
unit flash when the outdoor unit is faulty.
• Both the gas and liquid stop valves are completely open.
• A protective sheet covers the surface of the DIP switch panel on the control board
of the outdoor unit. Remove the protective sheet to operate the DIP switches easily.
10.1. Low noise mode (on-site modification) (Fig. 10-1)
10.1.1. Using the CNDM connector (Option)
By performing the following modification, operation noise of the outdoor unit can be
reduced.
1
The low noise mode will be activated when a commercially available timer or the
contact input of an ON/OFF switch is added to the CNDM connector (option) on the
3
control board of the outdoor unit.
• The ability varies according to the outdoor temperature and conditions, etc.
1 Complete the circuit as shown when using the external input adapter
(PAC-SC36NA-E). (Option)
2 SW7-1 (Outdoor unit control board): OFF
3 SW1 ON: Low noise mode
SW1 OFF: Normal operation
10.1.2. Using remote controller
Refer to the indoor unit installation manual.
10.2. Demand function (on-site modification) (Fig. 10-2)
By performing the following modification, energy consumption can be reduced to
0–100% of the normal consumption.
The demand function will be activated when a commercially available timer or the
contact input of an ON/OFF switch is added to the CNDM connector (option) on the
control board of the outdoor unit.
1 1 Complete the circuit as shown when using the external input adapter
(PAC-SC36NA-E). (Option)
3
2 By setting SW7-1 on the control board of the outdoor unit, the energy consump-
tion (compared to the normal consumption) can be limited as shown below.
Demand
function
SW7-1 SW2 SW3
OFF OFF
ON OFF
ON
ON ON
OFF ON
Energy consumption
100%
75%
50%
0% (Stop)