Installation manual
6
EKHBH/XE008AA3V3
Indoor unit for air to water heat pump system
4PW48441-1B
Main components
1.
Air purge valve
Remaining air in the water circuit will be automatically removed
via the air purge valve.
2.
Emergency backup heater
3.
Temperature sensors
Four temperature sensors determine the water and refrigerant
temperature at various points in the water circuit.
4.
Switch box
The switch box contains the main electronic and electrical parts
of the indoor unit.
5.
Heat exchanger
6.
Expansion vessel (10 l)
7.
User interface
The user interface allows the installer and user to set up, use
and maintain the unit.
8.
Refrigerant liquid connection
9.
Refrigerant gas connection
10. Shut-off valves (accessory)
The shut-off valves on the water inlet connection and water
outlet connection allow isolation of the indoor unit water circuit
side from the residential water circuit side. This facilitates
draining and filter replacement of the indoor unit.
11. Water inlet connection
12. Water outlet connection
13. Drain and fill valves
14. Water filter
The water filter removes dirt from the water to prevent damage
to the pump or blockage of the evaporator. The water filter must
be cleaned on a regular base. See
15. Expansion vessel drain valve
The drain valve of the expansion vessel allows draining the
remaining water in the expansion vessel after draining with the
drain and fill valves.
16. Manometer
The manometer allows readout of the water pressure in the
water circuit.
17. Flow switch
The flow switch checks the flow in the water circuit and protects
the heat exchanger against freezing and the pump against
damage.
18. Pump
The pump circulates the water in the water circuit.
19. Backup heater vessel
The backup heater heats the water in the backup heater vessel.
20. Backup heater thermal protector
The backup heater is equipped with a thermal protector. The
thermal protector is activated when the temperature becomes
too high.
21. Backup heater thermal fuse
The backup heater is equipped with a thermal fuse. The thermal
fuse is blown when the temperature becomes too high (higher
than the backup heater thermal protector temperature).
22. Pressure relief valve
The pressure relief valve prevents excessive water pressure in
the water circuit by opening at 3 bar and discharging some
water.
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3
8
9
10
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12
10
2
3
4
5
3
7
6
13
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20
3
Emergency backup heater operation always has
priority over compressor or booster heater operation.
Emergency backup heater operation occurs because of:
-
User request to heat up water to the space heating
loops. The temperature of this water is too low and
is out of the operation range (during initial start-up
for example).
-
During heating operation the water temperature
becomes too low and drops out of the operation
range.
-
Malfunction of the heat pump unit.
If during backup heater operation the heating load is
higher than the heater capacity, the water temperature
can not increase.
Summary of Contents for EKHBHE008AA3V3
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Page 30: ...4PW48441 1B Copyright Daikin ...
