Boiler Connections
23
Safety Connections and Pressure Testing
(continued)
Performing pressure test on the boiler
The boiler must be leak tested before
being placed in operation. Before boiler
is connected to piping or electrical
power supply, it must be
hydrostatically pressure tested.
1.
After installing safety devices (see
previous page), install temporary cap
on ¾” x 2” nipple.
2.
Cap supply and return connections.
3.
Connect ½” garden hose to boiler
drain valve at the bottom of the
boiler and fill boiler slowly until
pressure gage indicates max.
4 bar/60 psig.
4.
Maintain pressure for 15 minutes.
During time of pressure testing, do
not leave boiler unattended.
5.
Inspect all pipe joint connections and
safety devices with a flashlight for
leaks.
A lower manometer reading than
4 bar/60 psig usually indicates loss
of water due to leakage. All leaks
must be repaired.
6.
After 15 minutes, release water
pressure from boiler by opening
boiler drain valve slowly, remove
caps from supply and return
connections as well as ¾” cap from
2” nipple, and install pressure relief
valve immediately instead of ¾”
cap.
After boiler has passed pressure
test, proceed with the installation.
Max. operating pressure
3 bar/45 psig
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Testing pressure
4 bar/60 psig
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Max. boiler water temperature
210 °F/99 °C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation Examples
General
The schematics on the following pages
are to be seen as guidelines only. They
further do not display all system
varieties, safety devices, or concepts
possible. Specific system layouts may
be further discussed with the local
Viessmann sales representative office.
Clearances
A minimum of 2”/51 mm
circumferential clearance from
non-insulated hot water pipes to
combustible construction must be
maintained. In cases where the pipes
are insulated with pipe insulation of
appropriate and sufficient thickness
and insulation values, the above
clearance may be reduced to 0” (refer
to local gas codes).
5285
960
v1
.2
Exposing the boiler to pressures and
temperatures in excess of those
listed will result in damages, and will
render warranty null and void.
WARNING
For underfloor heating applications,
an additional immersion or strap-on
aquastat must be installed in the low
temperature underfloor loop
(downstream of the mixing valve) to
de-energize the pump and/or boiler to
prevent overheating. High water
temperatures can damage concrete
slabs.
CAUTION
Summary of Contents for Vitodens 200 WB2 11-44
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