Gas Rate & Gas Pressure; Procedure For Checking And Adjusting Gas Rate And Burner Pressure - gledhill GC2000/120/E-OV Design, Installation & Servicing Instructions

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Figure 25 Honeywell MFC and Venturi Sub-Assembly
(Refer to Figure 43 also)
T PIECE
SENSING LINE
FROM NIPPLE B
INLET PRESSURE
TEST NIPPLE
VERTICAL MANOMETER
Supplied By www.heating spares.co Tel. 0161 620 6677
DISCONNECT UNTIL APPLIANCE
IS RUNNING
INCLINED MICROMANOMETER
EXISTING SENSING LINE FROM
AIR INLET ELBOW REMOVED
FROM NIPPLE B
SENSING LINE
TEST NIPPLE
B
A
Figure 26
COMMISSIONING
7. PROCEDURE FOR CHECKING
AND ADJUSTING GAS RATE AND
BURNER PRESSURE (OFFSET)
To check and if necessary adjust the burner
pressure (offset), CO and CO
following equipment will be required:
A portable gas analyser - CO
maximum - CO range 500ppm.
A vertical manometer (U gauge) - range 30mbar
minimum.
An inclined or electronic micromanometer
- range ± 100 Pa (± 1.0 mbar) maximum. in
addition to set up the equipment a metal or
plastic T piece and a length of sensing line will
be required.
Refer to figures 25 and 26.
Note:
1. The inclined or electronic micromanometer
shall be capable of being read to 1 pascal
(0.01 mbar).
2. The inlet pressure test nipple and offset
presure test nipple A are opened by
turning the sealing screw once in a counter
clockwise direction.
3. A minimum dynamic inlet pressure (boiler
running) of 15mbar is necessary at the inlet
test nipple.
4. Counter clockwise adjustment (1⁄4 turn max.
at each attempt) of the throttle will increase
gas in and out hence CO
adjustment usually results in small, if any,
change in offset reading.
5. The final offset reading MUST always be
NEGATIVE.
6. Counter clockwise adjustment (1⁄4 turn max.
at each attempt) of the offset will cause it
to become more negative.
SENSING LINE
FROM NIPPLE A
Page 26
levels, the
2
range 12%
2
level. Throttle
2