Hamworthy WESSEX-HE 200 Installation, Commissioning And Servicing Instructions page 38

6.2 Exhaust Gas Volume and Temperatures
It is recommended that the volume and temperature
of the waste gas shown below are used for the design
of the flue system.
11.5.1 Gas Pressure Adjustment
After approximately 30 minutes of normal firing,
connecting a differential manometer to test points A &
B (either side of orifice) should check the gas
pressure differential across the gas orifice (reference
Figure No. 7). The pressure drop for Propane should
be 17.5mbar and minor adjustments to the appliance
governors may be necessary to correct for site gas
pressure conditions.
Two double solenoid valves arranged in parallel
control the main gas.
governors situated between the solenoids. Remove
the metal screw caps to reveal the adjusters beneath.
Adjust both valves to obtain the pressure drop of
17.5mbar across the orifice.
NOTE: The above is a first order check. Final setting
must be made using a gas meter.
11.5.2 Combustion Checks
A flue gas sampling point is provided in the front
boiler casing (see Figure No. 5).
combustion take a flue gas sample from each module
test point and for reference CO
should be between 9.5% and 10.5% or 6.5 to 5% O
Normal CO levels should not exceed 200ppm.
NOTE: All the above measurements refer to dry flue
gas samples.
HAMWORTHY HEATING LTD
Both valves have active
To check
measurements
2
WESSEX-HE 200 BOILER
14.0 REPLACEMENT OF FAILED COMPONENTS
14.4 Main Solenoid Valve Renewal
If for any reason it is necessary to change one of the
main solenoid valves, the correct model for propane
firing MUST be fitted (HHL part no. 533903021 - 2off).
MODELS OF THIS BOILER INTENDED FOR
PROPANE FIRING ARE FITTED WITH TWO
ACTIVE GOVERNOR MAIN SOLENOID VALVES.
15.0 RECOMMENDED SPARES FOR WESSEX-HE
200 RANGE (PROPANE).
The following items replace, or are in addition to
those listed in the main installer's guide.
DESCRIPTION
ELECTRICAL ITEMS
Main Solenoid Valve
MECHANICAL ITEMS
Pilot Injector (Propane) (marked 35)
.
2
32
PART NO.
533903021
532902043
500001008/K