Checks Prior To Lighting; Boiler Gas System Leak Check; Figure 7.1 Gas System Leak Check - Hamworthy F40V Installation, Commissioning And Operating Instructions

7.0 CHECKS PRIOR TO LIGHTING

IMPORTANT: BEFORE PROCEEDING ENSURE THAT THE PRE-COMMISSIONING CHECKS ON PAGE 19
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: the test detailed below must
be carried out on each module.
Note:-
Main Gas Supply Pressures are as follows;
Natural Gas - 20mbar
TO CHECK B
1) Turn off the electrical power and gas
supply 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 moni-
tor manometer over a 2 minute period, a
rise indicates a leak on valve B.
Figure 7.1 - Gas System Leak Check Diagram
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.
Water Systems
The system MUST be flushed and a suitable water treatment implemented before commissioning the boiler.
When installing water system pipe work, it must be self supporting and care must be taken to ensure that undue
stress is avoided on the boiler flow and return connections. It is recommended that unions are fitted local to the
boiler and outside of the casing, to permit future servicing requirements.
Each module is fitted with safety valve rated at 6bar. The valve discharge pipe is routed to the base of the boiler,
where it must be piped to discharge via a tundish (not HHL supply) suitably located for ease of visibility.
The Fleet is designed to operate at 20°C ∆T across the flow and return. Should the flow rate drop, the boiler
controls will modulate the burner to maintain 20°C ∆T. The boiler module is fitted with a single speed circulating
pump and flow is controlled through a balancing valve, which must be checked and set during commissioning. As
a safety precaution, a flow switch is fitted to the boiler heat exchanger to shut the system down in the event of
sudden adverse flow conditions.
Where using Hamworthy Heating Ltd pipe work kits, assembly of these is detailed in Installation manual
500005134 supplied with kit.
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HAMWORTHY HEATING LTD FLEET V series 500001213/G