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Boiler Connections
Connections
(continued)
Gas piping pressure test
When performing the gas piping pressure test, ensure the
following requirements are met.
WARNING
Never check for gas leaks with an open flame.
WARNING
Exposing boiler gas pressure regulator and gas valve to
extreme pressures renders warranty null and void.
IMPORTANT
½ psig = 14 "w.c.
1. Isolate the boiler from the gas supply piping system
using the individual manual shutoff valve during
pressure tests equal to or less than ½ psig (14 "w.c.)
2. The boiler and its individual shutoff valve must be
disconnected from the gas supply piping system
during any pressure testing of that system at test
pressures in excess of ½ psig (14 "w.c.)
3. Perform leak test.
Use approved liquid spray solution for bubble test.
Ensure that no liquid is sprayed on any electrical
components, wires or connectors. Do not allow
leak detection fluid to contact gas valve regulator
or regulator vent opening.
4. Correct any and all deficiencies.
5. Remove air from gas line.
20
Vitodens 200-W B2HB 45, 57 Installation
Heating water connections
1. Thoroughly flush heating system (particularly before
connecting the boiler to an existing system).
2. Connect boiler to the heating system.
Max. operating pressure: 4 bar (60 psig)
Test pressure:
IMPORTANT
Damage resulting from pressure exceeding those values
stated is not covered by Viessmann warranty.
3. Connect field supplied nipples and tees as shown
for DHW supply and return.
Legend
DR Boiler heating return for domestic hot water production
DS Boiler heating supply for domestic hot water production
BD Boiler Drain
BF Boiler Fill
BR Boiler Return
BS Boiler Supply
GC Gas Connection
PRV Pressure Relief Valve
*1 See page 40 for alternate DHW connection.
*2 Discard when using the multi-boiler distribution
manifold
IMPORTANT
Apply sufficient amount of thread sealant (supplied) when
making the connections.
6 bar (90 psig)
*1 DHW
Connections
(Field Supplied)
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