Mitsubishi Electric PUHY-P120YHMU-A, Service Manual

Page: 100 / 326

[
VII
Control ]
- 91 - HWE0804A GB
1) Unless otherwise specified, leave the switch to OFF where indicated by "-," which may be set to OFF for a reason.
2) A: Only the switch on either the OC or OS needs to be set for the setting to be effective on both units.
B: The switches on both the OC and OS need to be set to the same setting for the setting to be effective.
C: The setting is effective for the unit on which the setting is made.
3) When set to the capacity priority mode and if the following conditions are met, the Low-noise mode will terminate, and the unit
will go back into the normal operation mode.
Cooling: Outside temperature is high or high pressure is high.
Heating: Outside temperature is low or low pressure is low.
(2) INV board
1) PUHY-P72, P96, P120YHMU-A, PUHY-P72, P96THMU-A
Functions are switched with the following connector.
Œ
CN6 short-circuit connector is mated with the mating connector.
Œ
Leave the short-circuit connector on the mating connector during normal operation to enable error detection and protect the
equipment from damage.
Switch Function
Function according to switch setting Switch setting timing
Units that re-
quire switch
setting
Note.2
OFF ON OFF ON OC OS
SW5
1 - - - - - - -
2 - - - - - - -
3 - - - - - - -
4 - - - - - - -
5
Low-noise mode
selection
Capacity priority
mode
Note 3
Low-noise mode Before being energized
A -
6 - - - - - -
7 - - - - - -
8 - - - - - -
9 - - - - - -
10 Backup heating Ineffective Effective Any time after power on A -
Connector Function
Function according to connec-
tor
Setting timing
Enabled Disabled Enabled Disabled
CN6 short-
circuit con-
nector
Enabling/disabling the following error
detection functions;
ACCT sensor failure
(5301 Detail No. 115)
ACCT sensor circuit failure
(5301 Detail No.117)
IPM open/ACCT erroneous wiring
(5301 Detail No. 119)
Detection of ACCT erroneous wiring
(5301 Detail No.120) Error detec-
tion enabled Error detec-
tion disable
(No load op-
eration is pos-
sible.) Anytime after power on