EKHBH/XE008AA3V3
Indoor unit for air to water heat pump system
4PW48441-1B
Installation manual
15
The following table summarizes the required configuration and
thermostat wiring at the terminal block in the switch box. Pump
operation is listed in the third column. The three last columns indicate
whether the following functionality is available on the user interface
(UI) or handled by the thermostat (T):
•
space heating or cooling on/off (
y
)
•
heating/cooling changeover (
=
)
•
heating and cooling schedule timers (
pr
)
Pump operation configuration
Without room thermostat
When no thermostat is connected to the indoor unit, pump operation
will be determined by the leaving water temperature.
To force continuous pump operation when no room thermostat is
connected do the following:
-
set toggle switch SS2-3 to ON,
-
short-circuit the terminal numbers 1-2-4 on the terminal block
in the switch box.
With room thermostat
When a thermostat is connected to the indoor unit, the pump will
operate continuously whenever there is heating or cooling demand
requested by the thermostat.
Domestic hot water tank installation configuration
Initial start-up at low outdoor ambient temperatures
During initial start-up and when water temperature is low, it is
important that the water is heated gradually. Failure to do so may
result in cracking of concrete floors due to rapid temperature change.
Please contact the responsible cast concrete building contractor for
further details.
To do so, the lowest leaving water set temperature can be decreased
to a value between 15°C and 25°C by adjusting the field setting
[9-01] (heating set point lower limit). Refer to
Re-start at low outdoor ambient temperatures
When re-starting at low ambient temperature, it is important to
ensure that the unit operates within its operation range as soon as
possible (water temperature
≥
30°C) by reducing the load as much as
possible during start-up. This procedure is applicable whenever the
water temperature is out of the operation range (e.g. after long period
of stand still, ...).
For example:
You can do this by switching off the fans of the fan coil units until the
water temperature has increased to 30°C.
OR
For floor heating applications: start up circuit by circuit using a
(automatic) by-pass valve guaranteeing that water returning to the
unit is more than 20°C.
Thermostat
Configuration
Pump
operation
y
y
y
y
=
=
=
=
p
p
p
pr
r
r
r
No thermostat
• SS2-3 = OFF
• wiring: (non)
determined by
leaving water
temperature
(a)
(a) The pump will stop when space heating/cooling is turned off or when the water
reaches the desired water temperature as set on the user interface. With space
heating/cooling turned on, the pump will then run every 5 minutes during 3
minutes to check the water temperature.
UI
UI
UI
• SS2-3 = ON
• wiring:
on when space
heating or
cooling is on
(
y
)
UI
UI
UI
Heating only
thermostat
• SS2-3 = ON
• wiring:
on when
heating
request by
room
thermostat
T
—
—
Thermostat with
heating/cooling
switch
• SS2-3 = ON
• wiring:
on when
heating
request or
cooling request
by room
thermostat
T
T
—
th =
Thermostat contact
C =
Cooling contact
H =
Heating contact
L, N =
230 V AC
NOTE
To set the pump speed, refer to
X2M
H C L N
1
2
3
4
X2M
H C L N
1
2
3
4
X2M
H C
th
L N
1
2
3
4
X2M
H C
H
th
C
L N
1
2
3
4
■
When no domestic hot water tank is
installed, toggle switch SS2-2 should be set to
OFF (default).
■
When a domestic hot water tank is installed,
toggle switch SS2-2 should be set to ON.
NOTE
If leaving water temperature is set between 15°C and
25°C, heating is performed by the backup heater only.
4
3
2
1
ON
OFF
4
3
2
1
ON
OFF
Summary of Contents for EKHBHE008AA3V3
Page 29: ...NOTES NOTES ...
Page 30: ...4PW48441 1B Copyright Daikin ...
