Daikin EWYA004D2V3P Installer's Reference Manual page 129

EWAA004~008D + EWYA004~008D
Packaged air-cooled water chillers
and packaged air to water heat pumps
4P688013-1B – 2022.09
See "11.4.3 Schedule screen:
Cooling schedule
Applicable for all models.
Define a cooling schedule of the room temperature in [1.3] Cooling schedule.
See "11.4.3 Schedule screen:
Antifrost
[1.4] Antifrost prevents the room from getting too cold. This setting is
applicable when [2.9] Control=Room thermostat, but also offers functionality
for leaving water temperature control and external room thermostat control. In
case of the latter two, Antifrost can be activated by setting field setting
[2-06]=1.
Room frost protection, when enabled, is not guaranteed when there is no room
thermostat that can activate the heat pump. This is the case when:
▪ [2.9] Control=External room thermostat and [C.2] Space heating/
cooling=Off, or if
▪ [2.9] Control=Leaving water.
In the above cases, Antifrost will heat the space heating water to a reduced
setpoint when the outdoor temperature is lower than 6°C.
Main zone unit control method [2.9]
Leaving water temperature control
([C‑07]=0)
External room thermostat control
([C‑07]=1)
Room thermostat control
([C‑07]=2)
NOTICE
If the system does NOT contain a backup heater, then:
▪
Make sure that the room antifrost control is activated ([2-06]=1).
▪
Do NOT change the default room antifrost temperature [2-05].
▪
Make sure that the water pipe freeze prevention is activated ([4-04]≠2).
INFORMATION
If a U4 error occurs, room frost protection is NOT guaranteed.
4
Example" [ 117].
4
Example" [ 117].
Room frost protection is NOT guaranteed.
Allow for the external room thermostat to
take care of room frost protection:
▪ Set [C.2]
cooling=On.
Allow for the dedicated Human Comfort
Interface (BRC1HHDA used as room
thermostat) to take care of room frost
protection:
▪ Set antifrost [1.4.1] Activation=Yes.
▪ Set the temperature of the antifrost
function in [1.4.2] Room setpoint.
11 Configuration
|
Description
Space heating/
Installer reference guide
129