Manual

Midco International Inc.
7
8471 38
Part 1 Installation
VIII - Burner Set-Up/
Adjustment
WARNING: Reposition the combustion air shutter for the maximum fi ring rate of the
selected orifi ce capacity range
CAUTION: The approximate air and gas settings described below are for initial
start-up only. Final start-up settings must be made in accordance with Section VIII, Burner
Set-Up/Adjustment Instructions for the manifold gas pressure are detailed in Section XIII,
Combination Gas Valve.
EC 200 Natural Gas Propane Gas
Heat Manifold Air Orifi ce Air Manifold Air Orifi ce Air
Input Gas Shutter Size Restrictor Gas Shutter Size Restrictor
BTU/Hr Pressure Position Pressure Position
″ W.C. ″ W.C.
70000 2.6 1.0 0.173″ On 1.2 1.0 0.173″ On
100000 1.0 2.0 None On 2.3 2.0 0.173″ On
150,000 2.6 7.0 None On 1.2 7.5 None On
200,000* 4.1 9.0 None None 1.8 9.0 None None
EC 300 Natural Gas Propane Gas
Heat Manifold Air Orifi ce Air Manifold Air Orifi ce Air
Input Gas Shutter Size Restrictor Gas Shutter Size Restrictor
BTU/Hr Pressure Position Pressure Position
″ W.C. ″ W.C.
90,000 2.5 1.0 0.173″ On 1.1 1.0 0.173″ On
150,000 1.3 3.0 None On 2.8 3.0 0.173″ On
200,000 2.2 6.5 None On 1.2 6.0 None On
250,000 2.9 6.0 None None 1.6 6.0 None None
300,000* 4.0 9.0 None None 2.1 9.0 None None
* As Shipped from Factory
___________________________
WARNING: Ignition is automatic. Make spark observations into combustion chamber
only with Main Manual Shut-Off Valve closed. Confi rm that gas utilization equipment does not
contain any accumulated gases. Purge as described in Step 10 below.
1. Before burner start up, be sure to study and familiarize yourself with the exact sequence of
operation and all other details of this burner and the gas utilization equipment.
2. 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.
3. Purge the air from the gas supply line to expedite the fi rst light off.
4. Ensure the gas utilization equipment is in the proper operating condition.
5. Attach two gas manometers to the burner. Connect one to the inlet pressure tap of the gas
valve and the other to the outlet pressure tap of the gas valve.
6. Connect a microampmeter to the ignition controller to monitor the fl ame signal during the start
up process. Refer to the ignition control specifi cation sheet that is supplied with the burner for
proper lame signal requirements and sequence of control operation.
NOTE: Midco International reserves the right to change ignition controller or other components
without notice.
7. Set the burner air shutter to the proper setting according to the recommended data in Table 3
for zero draft condition.
8. To RE-SET the Electronic Burner Control a manual re-set is required. Turn the operating control
to Off or set the thermostat below room temperature for at least 30 seconds, or remove the 24v
for a period of 5 seconds, see Section XIV, Electronic Burner Control.
9. Confi rm that Main Manual Shut-Off Valve is open. Turn Manual Gas Cock Knob on Combination
Gas Valve to ON.
CAUTION: Purge gas to outside the building. Do not purge into the gas utilization
equipment.
VII Main Gas Spud
Continued
Table 3: Recommended Air Shutter Setting at Zero Draft Conditions and Orifice Size