Mitsubishi Electric CITY MULTI PUHY-400YMF-C Service Handbook page 41

PUHY-600·650·700·750 YSMF-C.
PUHY-400·500YMF-C.
1 Variable Capacity Unit
MAIN board
Switch Function
Unit Address Setting
SWU 1 ~ 2
For self diagnosis/
1 ~ 8
operation monitoring
SW1
-
9 ~ 10
Centralized Control
1
Switch
Deletion of connection
2
information.
Deletion of error history.
3
• Adjustment of Refriger-
4
ant Volume
• Ignore liquid level errors
SW2
-
5
-
6
Forced defrosting
7
-
8
-
9
Preserve suction pressure
10
SW3-2 Function Valid/
1
Invalid
Indoor Unit Test Operation
2
Defrosting start tempera-
3
ture.
Defrosting end tempera-
4
ture.
SW3
Target low-pressure
5
change
6 -
Target high-pressure
7
change
8 -
9 -
10 Models
1 -
2 Change service LED
3 -
4 Auto changeover function
-
5
SW4
6 Switch Models
7 -
8 -
9 -
10 -
Note 1: Factory setting is SWU 1 to 2 = 00, SW3 - 10 = set by model. All other switches are set to OFF.
Note 2: If the address is set from 01 to 50, it automatically becomes 100.
Note 3: The oper ation cumulative time of compressor is effective to it only within 1 hour.
Note 4: Factory settings are SW4-6 = OFF, setting = Y.
When operating in Super Y mode, turn SW4-6 ON.
Note 5: When Auto changeover function is valid, operating mode is decided by the indoor unit which
address number is minimum.
Function According to Switch Operation
When Off
Set on 51 ~ 100 with the rotary switch.*2
Refer to LED monitor display on the outdoor board.
-
Centralized control not Centralized control
connected. connected.
Storing of refrigeration Deletion of refrigeration
system connection system connection
information. information.
Store IC·OC error histor y. Erase IC·OC error history.
Ordinary control • Refrigerant volume
adjustment operation.
• Ignore liquid level errors
-
-
Ordinary control Start forced defrosting.
-
-
Valid during normal note: 3
operation
SW3-2 Function Invalid SW3-2 Function Valid
Stop all indoor units. All indoor units test run
ON.
0°C
7°C
Ordinary control Evaporation temperature /
2°C lower than normal
Ordinary control High pressure / 1.5 ~ 2.5 K
higher than normal
-
-
Model 400
-
Display variable capacity Display constant capacity
unit operations. unit operations.
-
Ordinary control Auto changeover Valid
-
Big Y Setting Super Y Setting
-
-
-
-
-38-
Switch Set Timing
When On When Off
Before power is turned on.
-
Before power is turned on.
Before power is turned on.
During normal operation when
power is on.
During normal
operation when
power is on.
-
-
During normal
operation when
power is on.
-
-
During normal operation when
power is on.
During normal operation when
power is on.
When SW3-1 is ON after power is
turned on.
– 2°C During normal operation when
power is on.
12°C During normal operation when
power is on. (Except during
defrosting)
During normal operation when
power is on.
-
During normal operation when
power is on.
-
-
Model 500 When switching on the power.
-
During nor
power is on.
When SW4-1 is ON
-
When switching on the power.
-
Before power is turned on.
-
-
-
-
When On
-
Invalid 2 hours
after compressor
starts.
-
-
10 minutes or
more after
compressor
starts.
-
-
-
-
-
-
mal operation when
-
-
-
-
-