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6.3
Water and Gas connection
6.3.1
General
The water and gas connections to the boiler are made using
the pump group, see fig. 10 (scope of delivery). This pump
group includes the circulation pump and a pressure relief
valve.
NOTICE
If you do not use the included pump group, you
have to install a separate circulation pump
under the boiler. This pump must be selected so
that the volume flow through the boiler is suffi-
cient to handle the maximum boiler input rating.
See paragraph 6.3.5 "Installing the pump",
page 19.
Install the pump group on the boiler in accordance with
the pump group installation instructions.
A single boiler must be installed with the included low loss
header to regulate the flow.
Install the low loss header (fig. 11, pos. 1).
NOTICE
Avoid installing the boiler above radiation levels.
If the boiler is installed above radiation sections,
a low water cutoff shall be installed and wired to
the boiler. Follow local code or in case of use of
a low water cutoff, be aware to use an air vent,
in order to prevent the boiler from shutting down
unnecessarily.
6.3.2
Connecting the pressure relief valve (PRV)
The pressure relief valve is a part of the supplied pump
group, see fig. 10. A listed ASME pressure relief valve
supplied with the boiler must be installed at the time of instal-
lation. No valve is to be placed between the PRV and the
boiler.
No reducing coupling or other restriction may be installed in
the discharge line. The discharge line must be a minimum of
4" (100 mm) above a drain and installed such that it allows
complete drainage of both the PRV and the line. The loca-
tion of the PRV must be readily accessible for servicing or
replacement and be mounted as close to the boiler as
possible. To install the PRV, a suitable fitting connected to
an extension on a "T" fitting can be sweated to the hot water
line. Support all piping.
Maintain an installation clearance from combustible
construction of at least 1" (25 mm) from the hot water piping.
Logamax plus GB162-80 kW/100 kW - Subject to modifications resulting from technical improvements!
1
2
Fig. 10 Pump group
pos. 1:
pressure relief valve
pos. 2:
supply water valve
pos. 3:
manual gas shutoff valve
pos. 4:
circulation pump
pos. 5:
gas inlet
pos. 6:
return water valve
pos. 7:
Pump group cover
1
Fig. 11 Low loss header
Installation
6
3
4
5
6
7
17
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