Air Source Heat Pump EAP range user manual - www.ecoairpump.co.uk
15. Function Description
15.1. Automatic Mode
The unit will select heating or cooling mode automatically depending on the current inlet water temperature.
When Ti
≥ Ts + P15, the unit enters cooling mode;
When Ti
≤Ts – P16, the unit enters heating mode;
Where Ti is inlet water temperature read by CN3, Ts is the set water temperature, P15 is the parameter value set in P15, and
P16 is the parameter value set in P16.
15.2. Cooling Mode
Compressor On Conditions:
When Ti
≥ Ts + P14, the compressor(s) is (are) on;
Compressor Off Conditions:
When Ti
≤ Ts, the compressor(s) is (are) off;
Where P14 is the parameter value as set in P14.
15.3. Heating Mode
Compressor On Conditions:
When Ti
≤Ts – P14, the compressor(s) is (are) on;
Compressor Off Conditions:
When Ti
≥ Ts, the compressor(s) is (are) off;
In units with dual compressors, there is a delay of thirty seconds between the two compressors
’ starts/shutdowns.
15.4. Hot Water Heating Mode
Hot water heating mode is only a submode in Cooling or Heating Mode. When the unit is installed for house heating or house
cooling and at the same time domestic hot water heating is needed, this function is needed. When the unit is installed only for
domestic hot water heating ( without house heating and house cooling ), do not activate hot water heating mode. Use heating
mode to control hot water heating.
Hot Water Heating Function Cut-in Condition
Water temperature ( ready by CN8)
≤ P1- P14
When above condition is satisfied, the three way valve will energize to direct the water from the condenser to the hot water
tank. Unit will be switched from cooling or heating mode to hot water heating mode.
Hot water Heating Function Cut-out Condition
Water temperature ( ready by CN8)
≥ P1
When the above condition is satisfied, the three way valve will de-energize to direct the water back to house heating
equipments.
15.5. Backup Electricity Heater Control
Heater On Conditions
a. Ti
≤Ts – P14-3
℃
, and
b. Ta
≤P7,and
c. The compressor has run for at least 60 seconds in heating mode.
Where Ti is inlet water temperature read by CN3, Ts is set water temperature, Ta is ambient air
temperature read by CN5, and P7 is the parameter value set in P7.
Heater Off Conditions
a. Ti
≥Ts - 2
℃
, or
b. Ta>P7
15.6. Fan Motor Control
In cooling mode, only high speed fan (FAN2) will be active.
In heating mode,
When the ambient temperature
≥ P22, only FAN1(low speed) will be active.
When the air temperature
＜
P22, only FAN2 (high speed) will be active.
