Mitsubishi Electric PQHY-P72ZLMU-A Service Handbook page 149

[ VII Control ]
Switch
SW4
SW6-10: 1-10
OFF
No.769 1000000011
No.832 0000001011
No.896 0000000111
No.912 0000100111
SW4
1-10
[0:OFF,
1:ON] No.914 0100100111
(Note 1)
SW6-10:
ON
No.917 1010100111
No.921 1001100111
No.922 0101100111
No.932 0010010111
No.981 1010101111
1) To change the settings, set SW6-10 to ON, set SW4, and press and hold SWP01 for 2 seconds or longer (OFF ON).
LED3 will light up when the switch setting is ON, and lights off when OFF.
Use the LED3 display to confirm that the settings are properly made.
The settings will need to be set again when the control board is replaced. Write down the settings on the electrical wiring draw-
ing label.
2) A: OC: Only the switch on OC needs to be set for the setting to be effective.
B: OC: The switches on both the OC and OS need to be set to the same seeing for the setting to be effective.
C: OC: The switches on both the OC and OS need to be set.
D: OC: The switch on either the OC or OS needs to be set.
3) The settings that are configured with SW4 (SW6-10: ON) will automatically be stored on the indoor units that support the new
function*. The stored settings will automatically be restored when the heat source unit control board is replaced.
If none of the connected indoor units supports the new function, no configuration information will be saved. If this is the case,
manually record the settings configuration on the control box panel.
*The new function is supported on most units that are manufactured in April of 2012 and later. Depending on the model, this
function may be added on later date. Ask your dealer for further details.
4) If the inlet water temperature (TH7) drops below 5ºC [41ºF] or the outlet water temperature (TH8) drops below 3ºC [37ºF] while
the compressor is stopped, the heat-source unit will operate in the Cooling-only mode to prevent freeze-ups while the indoor
units remain stopped.
This operation will terminate when one of the following conditions is met: 1) Both the TH7 and TH8 readings (water tempera-
ture) exceed 10ºC [50ºF], 2) Two hours have passed since the beginning of the Cooling-only operation, or 3) Signal to resume
normal operation is received.
5) Make this setting at the completion of test run with the ball valves BV1 and BV2 on the heat source unit being open.
HWE15150
Function according to
Function
OFF
(LED3 Unlit)
Refer to the LED monitor display
Self-diagnosis/opera-
on the heat source unit heat
tion monitor
source unit board.
Test run mode: ON/
Stops all ICs
OFF
Cumulative compres-
sor operation time dele- Retained
tion
Retained (IC/
OC
Clearance of er- OC)
ror history
OS Retained (OS)
Pump down function Normal control
Heat source
CN51-3,5 signal output
unit error out-
switch
put
Power on signal output During Ther-
switch mo-ON
Temperature unit dis-
°C
play
Refrigerant amount ad-
Normal control
justment
Heating backup Disabled
Water heat exchanger
Ineffective
freeze prevention
- 140 -
switch setting
Switch setting timing
ON
(LED3 Lit)
Anytime after power on
Sends a test-
run signal to all Anytime after power on
IC
Anytime after power on
Cleared
(OFF ON)
Deleted (IC/
OC) Anytime after power on
(OFF ON)
Deleted (OS)
After being energized and
Pump down
while the compressor is
operation
stopped
Water heat ex-
changer cou-
pling Anytime after power on
prevention out-
put
During Ther-
Anytime after power on
mo-OFF
°F Anytime after power on
Anytime after power on
Refrigerant (except during initial start-
amount adjust up/becomes ineffective
mode 60 minutes after compres-
sor started up.
Enabled Anytime after power on
Effective
Anytime after power on
Note 4
Units that
require
switch
setting
(Note 2)
C
A
C
C
A
C
A
C
A
A
A
GB