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8-3. Test operation of hot water module unit
Check function for operation of hot water module (Functions at hot water module side)
This function is provided to check the operation of the hot water module individually without connecting to the
remote controller or the outdoor unit. This function can be used regardless of the ON/OFF operation.
However, it is recommend to avoid using this function for along time, otherwise the trouble of the equipment
may occurred.
[How to operate]
1) Short-circuit CHK pin (CN071 on the hot water module P.C. board).
The operation mode may differ according to the hot water module status at that time.
Normal time: Both float SW and fan motor are normal.
Abnormal time: Either one of float SW or fan motor is abnormal.
2) During the normal time, the minimum opening degree (30pls) of the indoor PMV can be set only when both
CHK pin (CN71) and DISP pin (CN72) on the indoor P.C board are short-circuited. If the short-circuit at DISP
pin (CN72) is opened, the indoor PMV will be at the maximum opening degree (1500pls).
When open DISP pin, the maximum opening degree (1500 pls) can be obtained again.
[How to clear]
Open CHK pin. If the system is on operation, it will temporarily stop then automatically restart after a while.
• To exchange the hot water module PMV coil, set the hot water module PMV to Max. opening degree.
• For the detailed positions of CHK pin (CN071 on hot water module P.C. board) and DISP pin (CN072 on hot
water module P.C. board), refer to the hot water module P.C. board MCC-1744.
Short-circuit of CHK pin
Normal time
Abnormal time
DISP pin open DISP pin short circuit
Max. opening degree (1500 pls)
All ignored
Lights
Hot water module PMV (*)
Communication
P.C. board LED
Min. opening degree (30 pls)
All ignored
Lights
Min. opening degree (30 pls)
All ignored
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