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Manifold orifices – natural gas (1,000 Btu/cu. ft.)
Boiler
Orifices
Low Altitude
size
required
0-610m
ECD
0-2000ft.
Orifice size Ø
65
2
2.65
80
2
2.95
100
3
2.70
115
3
2.85
140
4
2.75
155
4
2.85
180
5
2.80
200
5
2.95
Manifold orifices – propane (2,500 Btu/cu. ft.)
Boiler
Orifices
Orifice
size
required
size
ECD
65
2
1.60
80
2
1.80
100
3
1.65
115
3
1.75
140
4
1.70
155
4
1.75
180
5
1.70
200
5
1.80
All orifice sizes given in mm! Orifice size is stamped onto each
orifice for identification. When ordering orifices, state boiler
size, type of gas, number of orifices required and orifice size.
Gas burner removal (see Fig. 7)
The main gas burner manifold with the individual stainless steel
burners mounted may be easily removed from the boiler by:
1.
Closing the main gas shut-off valve external to boiler.
2.
Disconnecting all power to boiler.
3.
Removing front cover panel from boiler.
4.
Breaking ground joint union before gas valve, remove gas
pipe.
5.
Disconnecting wiring to gas valve. Disconnect wiring from
igniter sensor and ground connection.
6.
Loosening manifold bolts. (Do not remove, only loosen).
Use socket with extension to access bolts through holes in
side panel.
7.
Removing burners once manifold is loose.
8.
Slide out on an upper angle to remove manifold.
Gas input – CAUTION
Do not exceed input rating stamped on rating plate of boiler.
1.
Close main gas shut-off valve.
2.
Disconnect main power supply to boiler.
1
3.
Remove plug (
⁄
˝) on manifold. Install test plug and
8
connect U-tube manometer or equivalent.
4.
Place boiler/burner in operation.
5.
Read manifold gas pressure and compare with stamped
rating on rating plate. If necessary, adjust pressure on gas
valve.
If using meter clocking method: Ensure there is no gas
flow through the meter other than to the boiler being
checked. Other appliances must remain off, including their
pilot burners.
6.
Deactivate boiler, reinstall
operation again.
7.
Repeat gas leak test at plug (
High Altitude
Gas valve/manifold
610-1370m
pressure
2000-4500ft.
˝w.c.
Orifice size Ø
2.55
3.5
2.80
3.5
2.60
3.5
2.75
3.5
2.65
3.5
2.80
3.5
2.65
3.5
2.80
3.5
Low Altitude
High Altitude
0-610m
610-1370m
0-2000ft.
2000-4500ft.
Gas valve/manifold
Gas valve/manifold
pressure ˝w.c.
pressure ˝w.c.
10˝
9˝
10˝
8˝
10˝
8˝
10˝
8˝
10˝
8˝
10˝
8˝
10˝
8˝
10˝
8˝
1
⁄
˝ plug, place boiler in
8
1
⁄
˝) and ensure tightness.
8
Main burner (see Fig. 8)
Proper flame:
Upper main flame cone with light orange
coloring, sharply defined individual flames
(Fig. 8).
Underfired:
Lazy-burning main flame cone, mushy flame
appearance throughout, smaller flame sizes
than in Fig. 8.
Overfired:
Increased burner noise, higher flame sizes
than in Fig. 8.
Main flame cone
Light
blue
Blue
Inner
flame
cone
Fig. 8
Front view of single burner
Fig. 9a
Q3451A Igniter/sensor location
Caution:
Gas burner positioning
For ECD boiler with Honeywell intermittent pilot (spark) ignition
the main burner for mounting the Q3451A pilot assembly
contains one less group of main burner ports (5). If the burners
are disassembled or replaced for any reason they must be
reassembled as shown in Figs. 9a, b, c, d, e. If the Q3451A
pilot assembly is accidentally assembled into a 6 port burner it
will be exposed to the flames from the first row of ports and will
overheat and become defective. Defective pilot will prevent
boiler from operating which could cause property damage from
freezing.
Burner
124mm
7
(4
⁄
˝)
8
14mm
9
(
⁄
˝)
1 6
Q3451A igniter/sensor
pilot burner
13
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