Test Operation Of Hot Water Module Unit - Toshiba MMW-AP0271LQ-E Service Manual

7-3. 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 singly without communication with the
remote controller or the outdoor unit. This function can be used regardless of operation or stop of the system.
However, if using this function for a long time, a trouble of the equipment may be caused. Limit using this
function within several minutes.
[How to operate]
1) Short-circuit CHK pin (CN71 on the hot water module P.C. board).
The operation mode differs according to the hot water module status in 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) Restricted to the normal time, if short-circuiting DISP pin (CN72 on the hot water module P.C. board) in
addition to short-circuit of CHK pin (CN71 on the hot water module P.C. board), the minimum opening
degree (30 pls) can be set to the hot water module PMV only.
When open DISP pin, the maximum opening degree (1500 pls) can be obtained again.
[How to clear]
Open CHK pin. While the system is operating, it stops once but automatically returns to operation after
several minutes.
Fan motor
Hot water module PMV (*)
Communication
P.C. board LED
• 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 (CN71 on hot water module P.C. board) and DISP pin (CN72 on hot
water module P.C. board), refer to the hot water module P.C. board MCC-1403.
Normal time
DISP pin open
(H)
Max. opening degree (1500 pls)
All ignored
Lights
Short-circuit of CHK pin
DISP pin short circuit
(H)
Min. opening degree (30 pls)
All ignored
Lights
– 21 –
Abnormal time
Stop
Min. opening degree (30 pls)
All ignored
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