Midco Economite RE4400B / RE4400BA - Manual (Page 10)

6. Turn operating control to ON or set thermostat above room temperature. After the pre-
purge is complete, the pilot should ignite. Whenever the burner pilot fails to light during
the ignition trial, or if the flame is lost during the burner run and is not reestablished
within 15 seconds after the pre-purge, the Ignition Control Module will shut off the
Automatic Safety Shut-off Valves and LOCK OUT. To RESET the Ignition Control Module
Control for restart, de-energize the Ignition Control Module by setting the operating
control to OFF or thermostat below room temperature for at least 30 seconds. If burner
still fails to light, turn it off and repeat from step 4 above. Then if necessary, refer to the
TROUBLE CHART to isolate the problem.
WARNING: Repeated unsuccessful attempts to light will result in accumulated
gases in gas utilization equipment and chimney. To prevent these gases from
reaching an explosive level, periodically purge the gas utilization equipment and
chimney as described in step 3 above.
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
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10
Part 1
Installation
Continued
Part 1 Installation
VIII Initial Start-
up /Adjustment
Continued
Figure 7A: General Assembly for RE4850BA, RE4700BA and RE4400BA