WH-SXC09H3E5, WH-SXC12H6E5, WH-UX09HE5, WH-UX12HE5 - Panasonic Air Conditioner Service Manual (repair manual). Page 109

109 

Purpose:  

-  Water pump install at each zone to circulate the water inside each zone during buffer tank connection 

selected “YES” or 2 zone systems. 

 

 

Content: 

-  AC type water pump install for this zone water pump control. When optional PCB connected, 230V output will 

drive this zone pump. 

-  There are three pump can be connected through Optional PCB. (Zone 1 Pump, Zone 2 Pump, & Pool Pump) 

* Zone 1 pump [P1] use to circulate zone 1 water circuit & Zone 1 mixing valve [M1] adjust to control the 
Zone 1 target water temperature. 
 
* Zone 2 pump [P2] use to circulate zone 2 water circuit & Zone 2 mixing valve [M2] adjust to control the 
Zone 2 target water temperature. 
 
* When Pool Function select as Zone 2 circuit, [P2] use to circulate water to heat exchanger which use to 
transfer heat to pool water. 
 
* Pool pump [P3] circulates the pool water through the heat exchanger to get warm water. 
 

  Zone 1 and Zone 2 water pump start condition: 

-  Zone room request ON 

(eg. Zone 1 thermo ON, only zone 1 pump will turn ON) 

  Zone 1 and Zone 2 water pump stop condition: 

-  Zone room request OFF 

  Pool water pump start condition: 

-  Pool Zone request ON AND 
-  Pool function is selected 

  Pool water pump stop condition 

-  Pool zone: Zone room request OFF OR 
-  Pool function is cancel 

* Zone 1 & Zone 2 water pump need to turn OFF when antifreeze deice pump stop control activate and turn 
ON back after the antifreeze deice pump stop control end under setting of "NO" buffer tank connection. 
 

 Start 

condition: 

Zone 1 water temperature ≥ 75°C continuously for 5 minutes 
*stop zone water pump operates if the zone water fulfilled. 

 Cancel 

condition: 

After 30 minutes from start condition fulfilled. 
*zone water pump operates according to normal condition.