gledhill GC2000/120/E, Design, Installation & Servicing Instructions

Page: 26 / 52

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Page 26 Page 27
GULFSTREAM
2000
To check and if necessary adjust the burner
pressure (offset), CO and CO
2
levels, the
following equipment will be required:
A portable gas analyser - CO
2
range 12%
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
2
level. Throttle
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.
7. PROCEDURE FOR CHECKING
AND ADJUSTING GAS RATE AND
BURNER PRESSURE (OFFSET)
Figure 25 Honeywell MFC and Venturi Sub-Assembly
(Refer to Figure 43 also)
COMMISSIONING
Figure 26
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INCLINED MICROMANOMETER
SENSING LINE
FROM NIPPLE A
EXISTING SENSING LINE FROM
AIR INLET ELBOW REMOVED
FROM NIPPLE B
SENSING LINE
FROM NIPPLE B
DISCONNECT UNTIL APPLIANCE
IS RUNNING
T PIECE
VERTICAL MANOMETER
INLET PRESSURE
SENSING LINE
TEST NIPPLE
B
TEST NIPPLE
A