7.
To make a preliminary setting of the burner input, determine the manifold gas pressure
required from Table 3 and adjust the Main Gas Pressure Regulator accordingly. See
Section XI.
8.
To determine the firing rate for NATURAL gas, accurately time test dial for the number
of seconds for one revolution and use the following formula. All other gas utilization
equipment must be off.
3600 x test dial size x BTU value
= BTU/Hr.
No. of seconds for one rev. test dial
Then divide by 1,000 for MBH value.
Example:
3600 x 1 x 1000
= 360,000 BTU/HR = 360 MBH
10
9.
Check the operation of the burner; start and stop it several times with the thermostat
or operating control.
10. With the burner running, check the operation of all limit and associated controls.
11. Perform the following final adjustments for combustion and flue gas temperature. Take the
flue gas samples and temperature immediately ahead of the draft control.
A.
The flue gas temperature should be above 325°F but not exceeding 550°F.
Excessive flue gas temperatures will result in low efficiencies. Low flue gas
temperature may cause excessive condensation. Reset gas input, if necessary, to
adjust stack temperature.
B.
Make the final setting of the combustion air shutter by checking the flue gases
with an
ORSAT or
similar combustion testing instrument. The carbon monoxide
content should conform to local codes, or in their absence, to the level specified
in the United States or Canadian Standard referenced on the front cover of this
10
Part 1
Installation
Continued
Part 1 Installation
VIII
Initial Start-
up /Adjustment
Continued
Figure 7A:
General Assembly for RE4850BA, RE4700BA and RE4400BA
