64
9 - START UP PROCEDURE
Approximate Rate @
100% Fire (MBH)
Size
GMHB125
122
GMCB150
122
GMHB160
160
GMCB200
160
Input Rate (MBH)
9.12 Check Firing Rate
1.
Measure input, if a gas meter is installed in the system.
•
Turn off gas to all other appliances.
• Activate all heating zones to dissipate heat.
•
Set boiler on high fire using Chimney Sweep Function.
• Use ½, 1 or 2 cu ft dial on gas meter. Measure time
required for two or more complete revolutions. Measure
time
for one or more minutes.
• Calculate input.
For Natural Gas :
Input (MBH)
=
3600 x cu ft
seconds
Example: Natural Gas - Gas flow from
Meter = 2 cu ft
Measured time = 72 seconds
=
3600 x 2 cu ft
= 100 MBH
72 seconds
For Propane (LP):
Input (MBH)
=
9160 x cu ft
seconds
For Metric formulas- See Glossary
2.
Compare measured input to Table 9.2. If calculated input
is not in range given in Table 9.2, check firing rate again
after setting the combustion following steps in section
9.11.
Table 9-2 Input Rate @ High Fire (MBH)
9.13 Adjusting Maximum Heating Power
Maximum boiler heating power can be reduced to suit
requirements of heating system it serves.
Table showing parameter
P13
values according to desired
maximum power model is shown for each single boiler.
To access and edit
P13
values, proceed as described in
Parameter Settings.
Boiler Model - PARAMETER P13 (%)/ Heating Output
CH
GMHB125
GMCB150
P13
Btu/hr
Output
Kw
26,460
7.8
4
32,420
9.5
11
38,380
11.3
18
44,340
13.0
25
50,300
14.8
31
56,260
16.5
38
62,220
18.2
45
68,180
20.0
52
74,140
21.7
59
80,100
23.5
66
86,060
25.2
73
92,020
27.0
79
97,980
28.7
86
103,940
30.5
93
109,900
32.2
100
CH
GMHB160
GMCB200
P13
Btu/hr
Output
Kw
35,440
10.4
4
43,480
12.8
11
51,520
15.1
18
59,560
17.5
24
67,600
19.8
31
75,640
22.2
38
83,680
24.5
45
91,720
26.9
52
99,760
29.3
59
107,800
31.6
66
115,840
34.0
73
123,880
36.3
79
131,920
38.7
86
139,960
41.0
93
148,000
43.4
100
PN 240012363 REV. A [08/31/2018]
