Pipe Installation; Maintenance; Dealing With Malfunctions - Nibe EKS 750 Installation And Maintenance Instructions Manual

GB
Installation and maintenance

Pipe installation

The water heater must be supplied with a drain valve,
shut-off valve, non-return valve, mixing valve, safety
valve, and a vacuum valve as per applicable standards,
as well as with a thermometer and pressure gauge.
Install the supplied drain valve on the drain connection
(7). Remove the compression ring and compression ring
nut from the drain valve and install the valve using the
existing compression ring, compression ring nut, and
support bush. Replace the compression ring with a plug
on the open side of the drain valve.
The heater must be supplied with a mixing valve, which
limits the temperature of outgoing hot water to 60°C.
If this valve is not fitted, some other measure must be
taken to prevent the risk of scalding.
The safety valve must be set to maximum 9 bar
(0.9 MPa) and its overflow pipe must run unobstructed
over the drain. The overflow pipe must be the same size
as the safety valve. The overflow pipe must be routed
downwards along its entire length and be frost proof.
The outlet of the overflow pipe must be visible.
Note!
Fit the cover discs before commencing pipe
installation.
Electrical connections
Note!
Electrical installation and service must
be carried out under the supervision of a
qualified electrician.
The water heater has three immersion heater connec-
tions for a maximum output of 3 x 9 kW. Separate
supply from group central is routed to each immersion
heater.
Each immersion heater is supplemented with junction
box type K11 (2-pole thermostat, 3-pole temperature
limiter).
Do not modify or reconnect!
Note!
The water heater must be completely filled
with water before it is connected on the
electrical side.
6
Filling
The water heater is filled by first opening a hot water
tap in the system and then opening the shut-off valve
for incoming cold water. This valve should then be fully
open during operation. The hot water tap can only be
shut off when the water heater is filled, which is when
only water comes out of the tap (initially an air-water
mixture comes out of the tap).

Maintenance

The safety valve must be inspected regularly, about 4
times a year, to prevent blockages. To inspect the valve,
open the safety valve manually and check that water
flows through the overflow pipe. If this does not hap-
pen, the safety valve is defective and must be changed.
The safety valve sometimes releases a little water after
hot water has been used. This discharge is caused by
the expansion of cold water entering the water heater,
resulting in a pressure increase, whereby the safety valve
opens.
Emptying
1. Turn off the power to the heater.
2. Shut off the incoming cold water.
3. Open the drain connection, or the drain valve if fit-
ted.
During emptying air must be let into the heater by
loosening a hot water connection (2) or opening a hot
water tap. To ensure complete emptying of the water
heater, a hose or pipe with outlets flowing out below
the lowest level of the heater must be attached to the
drain connection or drain valve. When installed in loca-
tions exposed to the risk of frost, the water heater must
be emptied whenever it is not in operation. Freezing will
result in the heater bursting.

Dealing with malfunctions

If the water fails to heat up, check the fuses in the dis-
tribution box. If none of the fuses have blown, the prob-
lem may be that the temperature limiter has tripped as
a result of a fault in the water heater. Once the fault has
been remedied, the temperature limiter can be reset.
This must be done under the supervision of a qualified
electrician.
Service
When servicing is required, contact the main contrac-
tor; you will always need to provide the manufacturing
number (95) and installation date.
Only spare parts supplied by NIBE AB in Markaryd may
be used.
EKS 750, 1000