Check Heating System And Domestic Hot Water Connections; Ensure Proper Operation Of Expansion Tank, Low Water Cut-Off (If Applicable) And Pumps; Ensure That An Adequate Combustion Air Supply Exists In The Boiler Room; Ensure Functionality Of The Barometric Draft Regulator Of The Burner - Viessmann Vitorond 100 VR1 Series Installation And Service Instructions Manual

Service
Vitorond 100, VR1-22 to -33 Installation and Service
Service Procedure
(continued)

Check heating system and domestic hot water connections

Ensure all connections are pressure tight.
Ensure proper operation of all safety devices
Check pressure gage, air vent and pressure relief valve.
Ensure pressure relief valve does not leak. Also ensure
pressure relief valve operates in accordance with
information provided by the manufacturer.
Ensure proper operation of expansion tank, low water
cut-off (if applicable) and pumps
Refer to maintenance instructions supplied with
diaphragm expansion tanks, low water cut-offs, pumps,
etc. Flush float water type low water cut-offs (if used).
The usual water fill pressure is between 10 and 15 psi
with the system cold. A lower pressure gage reading
usually indicates loss of water due to leakage.
All leaks must be corrected. Refer to instructions
packaged with automatic fill valve. Follow local
regulations with respect to backflow preventers.
If oil-lubricated pumps are used, ensure proper lubrication.
If motorized zone valves are used, refer to maintenance
instructions provided with zone valves. If an older
non-diaphragm expansion tank is used, ensure the correct
water level is present.
Ensure that an adequate combustion air supply exists
in the boiler room
Ensure fresh air intake of boiler room is open. This
opening must never be blocked or partially covered.
Ensure functionality of the barometric draft regulator
of the burner
During operation of the burner, the barometric draft
regulator installed in the vent system must move freely.
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