85
7-3.
Hydro Unit Control
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.
1) Determination condition: Low pressure sensor detects PS < 0.2 MPa and 180 seconds passes (defrosting and
cooling)
Low pressure sensor detects PS < 0.2 MPa and 10 minutes passes (heating and hot
water supply operation)
2) Determination cancellation condition
• After a restart, the start condition is not met for 30 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.
When A02 error appeared, the built-in circulation pump will stop.
Related DN
This DN_62 function is valid when DN_6B0 is “1”. (See 9.1. Hydro unit Setting)
Item Operation flow and applicable data, etc.
70
TWI, TWO, THO
(Diff: 2K)
A02 error detect
DN Setting item Default Setting available range
62 Activate/deactivate A02 error detection 0: Activate 1: Deactivate
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