Vitodens 200-W B2HB 45, 57 Installation
5680 493 - 05
30
Boiler Connections
Safety Connections and Pressure Testing
(continued)
Performing a boiler pressure test
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 in. x 2 in. nipple.
2. Cap supply and return connections.
3. Connect ½ in. garden hose to boiler fill valve at
the bottom of the boiler and fill boiler slowly until
pressure gage indicates max. 8 bar (120 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 8 bar (120 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 in.
cap from 2 in. nipple, and install pressure relief valve
immediately instead of ¾ in. cap.
7. After boiler has passed pressure test, proceed with
the installation.
Max. operating pressure...............4 bar (60 psig)
Testing pressure..........................6 bar (90 psig)
Max. boiler water temperature......210ºF (99ºC)
WARNING
Exposing the boiler to pressures and temperatures in
excess of those listed will result in damages, and will
render warranty null and void.
Waterside flow (primary circuit)
The Vitodens 200-W, B2HB is designed for closed loop,
forced circulation hot water heating systems only.
Use standard friction loss method for pipe sizing. Observe
boiler maximum and minimum flow rate limitations.
If system flow rate exceeds boiler maximum flow rate
(as stated above), falls below the minimum flow rate
or if system flow rate is unknown, Viessmann strongly
recommends the installation of a low-loss header.
Once the low-loss header is connected, the built-in low-
loss header logic of the Vitodens 200-W boiler ensures
the required
t across the system through the sensory
communication between the low-loss header and the
boiler.
An alternative method may be used, such as primary
secondary piping using closely spaced tees. A low-loss
header offers additional benefits not provided by a pair
of closely spaced tees. Viessmann therefore strongly
recommends and prefers the use of a low-loss header
over closely spaced tees. Refer to the Technical Data
manual for low-loss header information.
Waterside Flow
Low water cut-off
A low water cut-off may be required by local codes. If
boiler is installed above radiation level, a low water cut-off
device of approved type (field supplied) must be installed
in all instances. Do not install an isolation valve between
boiler and low water cut-off.
