Hydrostatic Pressure Test - Viessmann VD2-320 Installation Instructions Manual

Assembly

Hydrostatic Pressure Test

Installation of sensor well and preliminary air vent
Legend
A Sensor well
B R e in. plug
C Air vent
D Metric flanges*
*Two metric weld-neck flanges D are supplied with the
boiler (shipped inside combustion chamber). Use these
flanges to perform the hydrostatic test.
Use a metal plate of sufficient gage between these
flanges and the boiler supply/return connection during
the hydrostatic test. After successful completion of the
hydrostatic test, remove the metal plate and discard.
18
Vitorond 200, VD2 Series 320 to 1080 Installation
A hydrostatic pressure test is mandatory after the
assembly is complete and prior to the connection
of any additional piping, control, or safety devices
to the pressure vessel.
1. In the e in. tapping on top of the rear section, install
supplied R e in. plug B. After pressure test has
been completed, replace R e in. plug with supplied
manual or automatic air vent C (watch for proper
pressure rating).
2. In the c in. opening install the enclosed stainless
steel sensor well A using the supplied hemp and
pipe dope.
3. Close off main boiler supply and return with a blanc
metal plate and flanges D and attach a pressure
gage (0-150 psig range) to safety header, as well as
another automatic air vent (watch for proper pressure
rating) to bleed all air properly from safety header.
4. Fill pressure vessel with room temperature water
and check for proper venting of air.
5. The minimum hydrostatic test pressure must be
110 psig, the maximum at 1½ times the maximum
operating pressure of the boiler (not to exceed 120
psig). Should the city water pressure not be enough,
utilize a hand pump connected to the drain valve
of the boiler.
6. The test pressure should be maintained for 30
minutes. Inspect all top push nipple ports for leakage
using a flashlight. Inspect bottom push nipple ports
for leakage by sliding a piece of cardboard or paper
underneath the cast iron block.
7. When pressure vessel is tight, release pressure
carefully and slowly remove automatic air vent.
Close opening with plug supplied, utilizing hemp
and pipe dope.