DORCHESTER DR-LA 110, Руководство пользователя

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Installation
26 Instruction manual DR-LA
3
is
3.7 Water connections,
Vented
3.7.1 Cold water side
See
a
in Figure 3.3 .
• Fit an approved stop valve
i
on the cold water side between the water
tank
o
and the water heater, as required by regulations. Ideally the vent
pipe should be linked to a separate tundish/drain or else to the cold water
storage tank. Refer also to paragraph
1.3 Regulations and documents .
3.7.2 Top to bottom recirculating pump
You can connect a top to bottom recirculation pump to prevent stratification of
the water in the water heater.
1. Fit a pipe (Ø 22 mm), a stop valve
d
and a top to bottom recirculation
pump
k
.
2. Fit non-return valve
e
.
3. Fit stop valves
i
.
3.7.3 Hot water side
See
b
in Figure 3.3 .
n
Caution
Insulating long hot water pipes prevents unnecessary energy loss.
1. Fit a safety valve
c
a.
2. Optional: fit a temperature gauge
j
to be able to check the temperature of
the tap water.
3. Fit a stop valve
i
in the hot water outlet pipe, for use when servicing.
4. If a circulation pipe is to be fitted, then refer to paragraph 3.7.4 .
3.7.4 Circulation pipe
See
c
in Figure 3.3 .
If an immediate flow of hot water is required at draw-off points, a circulation
pump can be installed. This improves comfort and reduces water wastage.
1. Fit a circulation pump
f
of the correct capacity for the length and resistance
of the circulation system.
2. Fit a non-return valve
e
a downstream the circulation pump to guarantee the
direction of circulation.
3. Fit two stop valves for servicing
d
.
4. Connect the circulation pipe to the T-piece on the drain valve
g
. See
Figure 3.4 .
3.8 Gas connection
Warning
Gas installation may only be carried out by an authorised installation
engineer in compliance with the general regulations imposed by the gas
company.
Refer also to paragraph
1.3 Regulations and documents .
c
Note
Make sure that the diameter and length of the gas supply pipe are large
enough to supply sufficient capacity to the water heater.