Atag Blauwe Engel S-HR 15, Installation And Servicing Instructions

Page: 11 / 37

Installation instructions S-HR series page 11
6.4 Gas connection
The appliance pipe is fitted with an internal thread, into
which the tail piece of the gas tap can be screwed.
United Kingdom:
The gas supply must comply to the current Gas Safety
Regulations.
Ireland:
- Irish standard 813
- Domestic gas installations
The connection to the appliance must include a suitable
method of disconnection and a gas control cock must be
installed adjacent to the appliance for isolation purposes.
The nominal inlet working gas pressure measured at the
appliance should be 20 mbar for Nat gas (G20).
Make sure that the gas pipe work does not
contain dirt, particularly with new pipes.
6.5 Hot water supply (S-HR-T)
The sanitary water pipes can be connected to the
installation by means of compression fittings.
The cold water inlet on the S-HR-T boilers must be
provided with the following (counted in the water flow
direction):
- Dosing valve (supplied);
- Safety group;
- Expansion vessel 6bar (potable water, blue).
A dosing valve must be fitted in the cold water pipe. The
dosing valve provides that a quantity of water is supplied
which has a guaranteed outlet temperature of 60°C
(assuming a cold water temperature of 10°C). The
quantity of water is virtually unaffected by the water
pressure. With a water pressure lower than 1.5 bar it is
advisable to remove the inside mechanism of the dosing
valve. Connecting of the drinking water installation should
be done according to the national water laws.
6.6 Hot water supply S-HR 15, 24 and 35
Depending of the comfort preferences different external hot
water cylinders can be connected to the boiler. The choice
of the cylinder depends on the coil output. The coil output
must comply with the boiler output. The S-HR 15, 24 and
35 are provided with an internal 3 way valve. The return pipe
of the cylinder is simply connected to the connection under
the boiler. The flow pipe of the cylinder must be connected
to a T-piece in the flow pipe of the boiler. The electrical
connection are already made on the connection terminal in
the Control Tower. Only the wire of the cylinder sensor
should be connected to the terminal. See the wiring
diagram on page 14 and 15.
By the SH-R 51 and 60 with larger cylinder pipes (coil
resistance) we recommend the use of a cylinder pump.
6.7 Condensation drain pipe
The collective condensation drain pipe should be connected
to the drain by means of an open connection. By this means
the possibility of drain gases ending up in the boiler is
prevented. The drain connection should have a minimum
diameter of 25 mm.
The following components are connected to the collective
condensation drain pipe:
-
Condensation discharge;
- Safety valve;
Draining of the condensation water to the
external rain guttering is not permitted in
view of the danger of freezing.
Before putting the boiler into operation fill the
siphon with 300 ml of water.