Daikin EWAP400MBYN Сервис мануал онлайн [247/452] 524348

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ESIE05-07 Functional Control for a Standalone Unit
Part 2 – Functional Description 2–51
3
2
4
5
1
Function
description
Heat recovery is requested if the digital input sets the mode to heat recovery and the thermostat
requests heat recovery, based on the analogue signal of the inlet condenser sensor.
Thermostat function of Heat Recovery:
Heat recovery mode is activated if there's a heat recovery request, the circuit is on and the timer is
finished.
When heat recovery mode is activated following actions are taken:
P Heat recovery high pressure setpoint calculation:
P The condenser pump is activated. This pump remains "ON" until the heat recovery mode is
deactivated and the lag timer is 0.
P Inverter fan management is adapted to the new high pressure setpoint.
The economizer valve is operated. The economizer is used to avoid flash gas. This is accomplished
by expanding part of the refrigerant, and uses it to sub-cool the rest before expansion. The heat
exchange takes place in a smaller heat exchanger.
Operation of the economizer valve: economizer valve is activated when compressor is on
Setpoint
Difference
No
Yes
Thermostat requests
heat recovery
Heat recovery condenser
inlet temperature
Heat recovery
high pressure setpoint 1
Heat recovery
high pressure setpoint 2
Heat recovery setpoint
calculation [bar]
Difference 1 Difference 2 DiffCalc [°C]
Water temp - setpoint
ESIE05-07.book Page 51 Wednesday, October 11, 2006 10:42 AM

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