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Item
8-3.
15-4)Piping freeze prevention control 4
When the value of Ps sensor is low, freeze prevention is activated regardless of a heat pump operation mode.
Hydro Unit Control
1) Determination condition: Low pressure sensor detects PS < 0.2 MPa and 90 seconds passes (defrosting and
2) Determination cancellation condition
• After a restart, the start condition is not met for 180 minutes.
• At the next time of defrosting, the start condition is not met. (Defrosting operation for heating or hot water supply)
3) Error display
• If freeze determination cancellation condition is not met, A08 error is displayed.
16) High return water protect control
The hydro unit protects against high return water which made by separate boiler system.
TWI, TWO, THO
When A02 error appeared, the built-in circulation pump will stop.
Related FC
FC No.
62
This FC62 function is valid when DP_SW13-2 is ON. (See 10.1-1. Setting switch names and positions)
Operation flow and applicable data, etc.
cooling) (During a defrosting operation for cooling and heating, or hot water supply)
Low pressure sensor detects PS < 0.2 MPa and 10 minutes passes (heating and hot
water supply operation)
A02 error detect
70
50
Setting item
Activate/deactivate A02 error detection
(Diff : 2K)
Heat pump stop
Heat pump normal operation
Default
0: Activate
72
Setting available range
1: Deactivate
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