1
17
2
5
10
1
8
2
3
4
5.
5
12
6.
8.
7
9.
Main components
13.
Manometer
The manometer allows readout of the water pressure in the
Hydraulic compartment (door 3)
water circuit.
14.
Flow switch
The flow switch checks the flow in the water circuit and protects
the heat exchanger against freezing and the pump against
18
damage.
15.
Pump
The pump circulates the water in the water circuit.
16.
Backup heater thermal protector
16
13
2
The backup heater is equipped with a thermal protector. The
thermal protector is activated when the temperature becomes
too high.
17.
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).
15
3
18.
Pressure relief valve
The pressure relief valve prevents excessive water pressure in
the water circuit by opening at 43.5 psi (3 bar) and discharging
8
4
some water.
Functional diagram of hydraulic compartment (door 3)
3
1
2
3 4
5
6
7
9
8
7
14
12
3
R11T
R12T
11
6
3
t>
H
2
O
R14T
t>
1.
Air purge valve
t>
Remaining air in the water circuit will be automatically removed
via the air purge valve.
2.
Backup heater
R13T
t>
The backup heater consists of an electrical heating element that
will provide additional heating capacity to the water circuit if the
heating capacity of the unit is insufficient due to low outdoor
temperatures, it also protects the external water piping from
freezing during cold periods.
8
9
10
11
12
3.
Temperature sensors
Expansion vessel
Heat exchanger
4.
Four temperature sensors determine the water and refrigerant
temperature at various points in the water circuit.
Heat exchanger
Manometer
Air purge valve
Pressure relief valve
9
10
11
Flow switch
Drain/fill valve
Filter
Expansion vessel (2.6 gallons (10 l))
Backup heater vessel
Shut-off valve water inlet with
Refrigerant liquid connection
with backup heater
drain valve
7.
Refrigerant gas connection
6
Pump
R11T
Shut-off valves
The shut-off valves on the water inlet connection and water
Shut-off valve water
outlet
R12T
R13T
R14T
Temperature sensors
outlet connection allow isolation of the unit water circuit side
from the residential water circuit side. This facilitates draining
and filter replacement of the unit.
Water inlet connection
10.
Water outlet connection
11.
Drain and fill valve
12.
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 "Maintenance and service"
on page 37.
Installation manual
EDLQ036~054B EBLQ036~054BA6VJU1
12
Unit for air to water heat pump system
4PW56182-1
