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8 Configuration
Installer reference guide
56
EWAQ+0 EK(2)CB
EKMB9W1
Packaged air-cooled water chillers and packaged air to water heat
pumps
4P492901-1 – 2017.06
Room temperature offset
ONLY applicable in case of room thermostat control. You can
calibrate the (external) room temperature sensor. It is possible to
give an offset to the room thermistor value measured by the user
interface or by the external room sensor. The settings can be used
to compensate for situations where the user interface or external
room sensor CANNOT be installed on the ideal installation location
(see installation manual and/or installer reference guide).
#
Code
Description
Room temp. offset: Offset on the actual room temperature
measured on the user interface sensor.
[A.3.2.2]
[2-0A]
–5°C~5°C, step: 0.5°C (default: 0°C)
Ext. room sensor offset: ONLY applicable if the external room
sensor option is installed and configured (see [C-08])
[A.3.2.3]
[2-09]
–5°C~5°C, step: 0.5°C (default: 0°C)
Room frost protection
Room frost protection prevents the room from getting too cold. This
setting behaves differently depending on the set unit control method
([C‑07]). Perform actions according to the table below:
Unit control method ([C‑07])
Room frost protection
Room thermostat control
([C‑07]=2)
Allow for the room thermostat to
take care of room frost
protection:
▪ Set [2‑06] to "1"
▪ Set
the
room
antifrost
temperature ([2‑05]).
External room thermostat control
([C‑07]=1)
Allow for the external room
thermostat to take care of room
frost protection:
▪ Turn ON the leaving water
temperature home page.
Leaving water temperature
control ([C‑07]=0)
Room frost protection is NOT
guaranteed.
NOTICE
If the system does NOT contain a backup heater, do NOT
change the default room antifrost temperature.
INFORMATION
If a U4 error occurs, room frost protection is NOT
guaranteed.
Refer to the sections below for detailed information on room frost
protection in relation to the applicable unit control method.
[C‑07]=2: room thermostat control
Under room thermostat control, room frost protection is guaranteed,
even if the room temperature home page is OFF on the user
interface. When room frost protection ([2‑06]) is enabled and the
room temperature drops below the room antifrost temperature
([2‑05]), the unit will supply leaving water to the heat emitters to heat
up the room again.
#
Code
Description
N/A
[2-06]
Room frost protection
▪ 0: disabled
▪ 1: enabled (default)
N/A
[2-05]
Room antifrost temperature
4°C~16°C (default: 16°C)
INFORMATION
If a U5 error occurs:
▪ when 1 user interface is connected, room frost
protection is NOT guaranteed,
▪ when 2 user interfaces are connected and the second
user interface used for room temperature control is
disconnected (due to miswiring, damage of the cable),
then room frost protection is NOT guaranteed.
NOTICE
If Emergency is set to Manual ([A.6.C]=0), and the unit is
triggered to start emergency operation, the user interface
will ask confirmation before starting. Room frost protection
is active even if the user does NOT confirm emergency
operation.
[C‑07]=1: external room thermostat control
Under external room thermostat control, room frost protection is
guaranteed by the external room thermostat, provided that the
leaving water temperature home page is ON on the user interface,
and the auto emergency setting ([A.6.C]) is set to "1".
Additionally, limited frost protection by the unit is possible:
▪ When the leaving water temperature home page is OFF and the
outdoor ambient temperature drops below 4°C, then the unit will
supply leaving water to the heat emitters to heat up the room
again, and the leaving water temperature setpoint will be lowered.
▪ When the leaving water temperature home page is ON, the
external room thermostat is "Thermo OFF" and the outdoor
ambient temperature drops below 4°C, then the unit will supply
leaving water to the heat emitters to heat up the room again and
the leaving water temperature setpoint will be lowered.
▪ When the leaving water temperature home page is ON and the
external room thermostat is "Thermo ON", then room frost
protection is guaranteed by the normal logic.
[C‑07]=0: leaving water temperature control
Under leaving water temperature control, room frost protection is
NOT guaranteed. However, if [2‑06] is set to "1", limited frost
protection by the unit is possible:
▪ When the leaving water temperature home page is OFF and the
outdoor ambient temperature drops below 9°C, then the unit will
supply leaving water to the heat emitters to heat up the room
again, and the leaving water temperature setpoint will be lowered.
▪ When the leaving water temperature home page is ON and the
operation mode is "heating", then the unit will supply leaving water
to the heat emitters to heat up the room according to normal logic.
▪ When the leaving water temperature home page is ON and the
operation mode is "cooling", then there is no protection.
Water pipe freeze prevention
Water pipe freeze prevention is a protective function that tries to
keep the water temperature of the system within the operation range
of the heat pump.
#
Code
Description
N/A
[4-04]
▪ 0
(Intermittent
pump
operation):
Protection enabled.
▪ 1
(Continuous
pump
operation):
Protection enabled.
▪ 2 (No protection): Protection disabled.
NOTICE
If negative ambient temperatures are expected, do NOT
disable this function.