Midco Economite RE4400DS HTD - Manual (Page 6)

6
5. 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 or 360 MBH
10
6. Check the operation of the burner; start and stop it several times with the thermostat
or operating control.
7. With the burner running, check the operation of all limit and associated controls.
8. Perform the following final adjustments for combustion and flue gas temperature. Take the
flue gas samples and temperature immediately ahead of the draft control or as specified
by the equipment manufacturer.
A.
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
manual or within the limits prescribed by local codes.
9. Check the draft control, if equipped with one, to make sure there is no spillage of flue
products into the room.
____________________________
DANGER: Do not tamper with the unit or controls. If trouble occurs contact
the installing contractor, service agency, fuel supplier or equipment manufacturer.
See front cover.
DANGER: Be sure that the main Shut-Off Valve is closed and the burner
power supply is turned off before removing any parts for service.
CAUTION: Cover plates, guards, and enclosures must be maintained in
place at all times except during maintenance and service.
____________________________
Part 1
Installation Continued
Part 2 Service
V Initial Start-
up /Adjustment
Continued
Part 2
Service
VI Electrodes
Figure 3: General Assembly for the RE4400DS HTD