Hamworthy Wessex ModuMax mk3 WM97/97H, Installation, Commissioning And Servicing Instructions

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HAMWORTHY HEATING LTD
26
Wessex ModuMax mk3 Boilers 500001308/C
(Note: Above readings taken with front cover removed and 200mm probe insertion CO = < 60 ppm*).
High Fire Target Nat Gas - 9.0% ±0.25% CO
2
LPG - 10.6% ±0.25% CO
2
If combustion level is outside of this range use the
Throttle Screw to adjust the mixture.
T
HIS SETTING MUST BE CORRECT BEFORE CONTINUING
To increase the CO
2
level, turn the adjustment
anti - clockwise.
Figure 8.6.4 - Adjusting gas valve throttle
Low Fire Target Nat Gas 9.0% ±0.25% CO
2
LPG - 10.6% ±0.25% CO
2
If combustion readings are outside target range use a
screwdriver to make adjustments
To increase the CO
2
level, turn the adjustment
clockwise.
Figure 8.6.5—Adjusting gas valve offset
97 / 116 / 147
97 / 116 / 147
196 / 254
196 / 254
If combustion is outside of the ranges defined below the factory sealed valves may be adjusted using the
following procedure :
High Fire Target Nat Gas 9.0% ±0.25% CO
2
LPG - 10.6% ±0.25% CO
2
If combustion level is outside of this range use the
Cross Head Throttle Screw to adjust the mixture.
T
HIS SETTING MUST BE CORRECT BEFORE CONTINUING
To increase the CO
2
level, turn the adjustment
anti - clockwise.
Figure 8.6.4 - Adjusting gas valve throttle
Low Fire Target Nat Gas 9.0% ±0.25% CO
2
LPG - 10.6% ±0.25% CO
2
If combustion readings are outside target range use
Torx Bit to make adjustments
To increase the CO
2
level, turn the adjustment
clockwise.
Figure 8.6.5—Adjusting gas valve offset