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Gas Piping - Andrews FASTflo WH42 Installation Manual, Operation And Maintenance Manual

Continuous flow wall hung balanced flue heaters for natural gas and lpg.
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9.

Gas Piping

The appliance 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 35 mbar.
The Appliance must be isolated from the gas supply piping system by closing its individual manual shutoff
valve during any pressure testing of the gas supply piping system at test pressures equal to or less than
35 mbar.
The appliance and its gas connections must be leak tested before placing the appliance in operation.
The inlet gas pressure must be within the range specified. This is for the purposes of input adjustment.
Measuring Gas Pressure
In order to check the gas supply pressure to the unit, a
tap is provided on the gas inlet. Remove the hex head
philips screw from the tap, and connect a manometer
using a silicon tube.
Manifold Gas Pressure Adjustment
NOTE:
* Use the following procedure to adjust the manifold gas pressure
only if it can be done with a high flow rate through the unit.
(1) With a manometer or pressure guage connected to the manifold pressure
tap, press and hold the maximum pressure set button. Use the manifold
pressure increase and decrease buttons to adjust to the correct pressure.
(2) Press and hold the minimum pressure set button. Use the
manifold pressure increase and decrease buttons to
adjust to the correct pressure.
(3) Repeat steps (1) and (2) until both are at the correct pressure.
16
Page 16
Follow the instructions from the gas supplier.
Manifold Pressure
Increase Button
Manifold Pressure
Decrease Button
Minimum Pressure
Set Button
Maximum Pressure
Set Button
05.9.26, 7:41 PM
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