Performing Pressure Test On The Boiler - Viessmann WB1A Series Installation And Service Instructions Manual

Safety Connections and Pressure Testing

Performing pressure test on the boiler

Hot water temperature and system pressure
w A
160
20
psi
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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. Cap supply and return connections
(¾" NPT Male).
2. 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.
3. Maintain pressure for 15 minutes.
During time of pressure testing, do
not leave boiler unattended.
4. 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.
Hot water temperature reading
The hot water reading is constantly
displayed during operation.
ºF
(continued)
5. 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.
Exposing the boiler to pressures and
temperatures in excess of those
listed will result in damages, and will
render warranty null and void.
Pressure reading
1. Turn the knob „tr" to the left on
„9". The display will show the
actual system pressure (e.g. 20
psig).
2. Turn the knob back to the original
position.
Note:
When the system pressure falls below
8 psig, it will be indicated by a flashing
display. If this happens, contact your
heating contractor.
Boiler Connections
WARNING
25