HAMWORTHY HEATING LTD
14
WESSEX MODU
MAX
100 SERIES
500001123/C
Note:-
Main Gas Supply Pressures are as follows;
Natural Gas - 20mbar
TO CHECK B
1)
Turn off the electrical power and gas to the appliance.
2)
Connect the manometer assembly to test point (Fitted on the inlet to the gas valve).
3)
With A and B closed open C and monitor manometer over a 2 minute period, a rise indicates a leak on valve B.
TO CHECK A
1)
Open C.
2)
Open B to produce the mains gas supply pressure between A and B.
3)
Close B.
4)
System may be considered sound if over a period of 2 minutes any drop in pressure is less than 0.5 mbar (0.2" wg.).
Note:-
Allow a manometer stabilisation period of approximately 1 minute before each 2 minute check period. Following
soundness tests close valve B and remove manometer connections and tighten test points.
7.0 Checks Prior to Lighting
IMPORTANT: BEFORE PROCEEDING ENSURE THAT THE PRE-COMMISSIONING CHECKS ON PAGE 14
HAVE BEEN CARRIED OUT AND THE RESULTS SATISFACTORY.
7.1 Boiler Gas System Leak Check
Ensure that the appliance manual gas service valve is in the
OFF
position. Although the boiler receives a gas leak
check and gas train component integrity check prior to leaving the factory, transport and installation may have
caused disturbance to unions, fittings and gas valve assemblies etc.
A procedure guide is given below. Care must be taken not to allow leak detection fluid (if used) on or near any
electrical parts or connections.
NOTE: When testing 2 or 3 high stacked appliances the test detailed below must be carried out on each
module.
Figure 7.1 - Gas System Leak Check Diagram
