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HWE09080 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) The noise level is reduced by controlling the compressor frequency.
A setting of CN3D is required.(page 24)
4) If the inlet water temperature (TH7) drops below 5ºC [41ºF] while the compressor is stopped, or the outlet water temperature
(TH8) drops below 3ºC [37ºF], Cooling-only operation will be performed to prevent freeze-ups.
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.
Switch Function
Function according to switch setting Switch setting timing
Units that re-
quire switch
setting
Note.2
OFF ON OFF ON OC OS
SW3
1
Test run mode: en-
abled/disabled
SW3-2 disabled SW3-2 enabled Anytime after power on
A-
2
Test run mode: ON/
OFF
Stops all ICs
Sends a test-run
signal to all IC
After power on and when
SW3-1 is on.
A-
3
CN51-3,5 signal out-
put switch
Heat source unit er-
ror output
Water heat ex-
changer coupling
prevention output
Anytime after power on
CC
4
Water heat exchang-
er freeze prevention
Ineffective
Effective
Note 4
Anytime after power on
A-
5- - - - --
6- - - - --
7- - - - --
8- - - - --
9- - - - --
10 - - - - - -
SW4
1- - - - --
2- - - - --
3
Refrigerant amount
adjustment
Normal operation
mode
Refrigerant amount
adjust mode
Anytime after being ener-
gized (except during ini-
tial startup mode.
Automatically cancelled
90 minutes after com-
pressor startup)
A-
4
Low-noise mode/
step demand switch-
ing
Low-noise mode
(Note 3)
Step demand mode Before being energized
CC
5- - - - --
6
Cumulative com-
pressor operation
time data deletion
Cumulative com-
pressor operation
time data is re-
tained.
Cumulative com-
pressor operation
time data is delet-
ed.
Anytime after power on
(when the unit is turned
on)
CC
7- - - - --
8- - - - --
9- - - - --
10 - - - - - -