Simultaneous Operation (Indoor Unit + Tank Unit) - Panasonic WH-ADF0309J3E5CM Service Manual

17.2 Simultaneous Operation (Indoor Unit + Tank Unit)

Category
Cooling
Heating
When different combination of operation setting is set at indoor unit and tank unit, different mode is carried out.
17.2.1 Heat Recovery Mode
This mode is to utilise the waste energy to heat up the tank unit, instead of wasted to outdoor ambient.
The mode is allowed if all of the conditions below are satisfied.

Indoor unit is set at Cooling operation and it is not in Quiet or Powerful operation

Tank unit is set at Heating operation and it is not in Force DHW mode

Outdoor temperature is higher than 10ºC

Not in starting control
Operation content:
Heat recovery mode is carried out
17.2.2 Bi-Heating Mode
This mode is to operate heating operation at indoor unit and tank unit simultaneously.
The mode is allowed if all of the conditions below are satisfied.

Indoor unit is set at Heating operation

Tank unit is set at Heating operation and it is not in Force DHW mode

Outdoor temperature is higher than -5ºC
(If outdoor temperature is lower than -5ºC, the water inlet temperature has to be lower than 40ºC)

Not in starting control
Operation content:
Bi-Heating mode is carried out
17.2.3 Mode Change
When the combination of operation setting is changed, the mode is changed from one to another.
If the mode change is within the same category (Cooling or Heating), the mode change is carried out by changing the
4-way valve and expansion valve setting, followed to the predetermined control setting.
During this process, the compressor operates in a low frequency setting.
If the mode change is in the different category (Cooling <--> Heating), the compressor stops.
After 3 minutes, the compressor restarts and the 4-way valves and expansion valves setting follows to the
predetermined control setting in order to operate in the target mode.
17.2.4 4-way Valve Setting Change
During mode change, the 4-way valve setting is changed when
1. it involves the category change
2. it involves the tank unit operation setting change (OFF <--> Heating)
When 4-way valve setting is changed, there is a intermittent refrigerant gushing sound can be heard at outdoor unit.
Room
Cooling
Cooling
Heating
OFF
Heating
Tank
OFF
Heating Heat Recovery
OFF
Heating Tank Heating
Heating Bi-Heating
211
Mode
Cooling
Heating