Midco Economite RE4400DS HTD - Manual (Page 5)

After checking for leaks, purge the gas line up to the burner inlet. Purging the air from the
gas supply line at this step will expedite the first light-off.
NOTE: If there is more than 1.0" W.C. differential in the inlet pressure to the burner
compared to when all other gas utilization equipment are off, refer to Section VII.
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Burners are approved for use with NATURAL gas and should be used only with the gas
specified on the rating plate.
The gas input should be set at the heating rate determined by the building heat loss and/or
heating plant survey, but not exceeding the rated maximum input of the gas utilization
equipment or Economite burner.
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WARNING: Ignition is automatic. Make spark observations into combustion
chamber only with Main Manual Shut-Off Valves closed. Confirm that gas utilization
equipment does not contain any accumulated gases. Purge as described in step 3
below.
CAUTION: Cover plates, guards, and enclosures must be maintained in place
at all times except during maintenance and service.
1.
Check the burner piping and valves for gas leaks by applying a weak liquid soap
solution to unions and joints with the gas supply on. Leakage will be indicated by the
appearance of soap bubbles. Locate and correct all gas leaks before proceeding.
WARNING: DO NOT USE OPEN FLAME.
2. Purging the air from the gas supply line at this step will expedite first light-off.
IMPORTANT: Purge outside the building. Do not purge into the gas utilization
equipment.
3. To purge the gas utilization equipment and chimney of any accumulated gases, turn
main Manual Gas Cock OFF, turn burner power on, and set operating control to ON or
thermostat to call for heat. Let the blower run long enough to accomplish four
combustion chamber volume air changes, but not less than five minutes.
CAUTION: Make sure that the capacity range of the burner, manifold pressure,
and the preliminary combustion air shutter setting are suitable for capacity rating of
the gas utilization equipment. Refer to Section V and Table 3.
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 or chimney as described in step 3 above.
4. 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 on the combination
gas valve accordingly.
5
Part 1
Installation Continued
Part 1 Installation
IV Main Gas
Input Selection
V Initial Start-
up /Adjustment
Table 3: Capacity and Preliminary Gas Settings
1 . Adjust the main regulator to vary the manifold gas pressure and burner input within the range
shown. Do not exceed pressure as listed in Table 3, under any circumstances. Use combustion
readings (CO and O2) and a flow meter to determine exact inputs.
DATA FOR TABLE IS APPROXIMATE AND BASED
ON “0" OVERFIRE PRESSURE AT SEA LEVEL
Natural Gas Pressure Settings
4.5
3.5
1.8
400
350
250
Input
MBH
Natural Gas
Manifold 1
Pressure
("W.C)
RE4400DS HTD (High Fire Settings)