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6.

The low fire bypass and the Modulating Gas Valve are pre-set by the factory for a 
minimum firing rate of 20 MBH. The flame signal at this firing rate should be 
above 2  DC micro amps.

7.

Check the modulation tracking by modulating the burner to 4 Volts DC signal. The 
manifold pressure should be approximately 0.8” to 0.9” W.C.  If not, loosen the 
7/16” nut on the Modulating Gas Valve Actuator and make necessary adjustment 
with the green handle of the butterfly valve (see Figure 4). Retighten the nuts and 
modulate the burner to low fire (2 Volts DC) and back up to 4 Volts DC again to check 
the adjustments. If the manifold pressure is not as specified, repeat step 7 again.

8.

The damper should be flush with the low fire stop. The O

2

concentration of the flue 

exhaust at the low fire rate should be approximately 10% +/-2. To adjust the O

2

level at

low fire (allow more air or reduce the air), vary the alignment between the damper and 
the inlet ring. Minimum air shutter adjustment can be done by adjusting the three 8-18 
screws on the inlet ring (see Figure 5). To increase or decrease the O

2

percentage 

substantially loosen the air damper from the shaft and make necessary adjustment.
Check combustion readings to verify burner performance.

____________________________

Special equipment, either factory or contractor installed, may cause variation in the
procedures and descriptions given in this manual.

Consult the OEM's manual to identify the differences in the information.

____________________________

8

Part 2 

Service Continued

Part 2 Service

XI

Special

Equipment 

(OEM Versions)

X Start 

Up

Continued 

Midco

®

International Inc.

4140 West Victoria Street   Chicago, Illinois 60646

1107  

tel  773.604.8700    fax  773.604.4070    web   www.midcointernational.com    email  [email protected]

8471 50

Printed in USA

Figure 4:

Valve Train Assembly

RE4400DS HTD

Figure 5:

Damper Location at High Fire Firing Rate - 250 MBH, 350 MBH and 400 MBH

RE4400DS HTD

Summary of Contents for Economite RE4400DS

Page 1: ...ry to light any appliance Do not touch any electrical switch do not use any phone in your building Immediately phone your gas supplier from another building Follow the gas supplier s instructions If y...

Page 2: ...ion chamber and to permit burner removal or as recommended by the equipment manufacturer CAUTION In no case should the burner tube be allowed to extend into the chamber because high combustion chamber...

Page 3: ...ximum firing rate of the burner the gas supply piping must be sized to provide a minimum pressure of 7 0 W C Natural for 400 MBH to the inlet of the combination redundant valve when the burner and all...

Page 4: ...rop however the size must be sufficient to deliver burner rating pressure CAUTION High gas pressure supply lines require the proper pressure reducing regulators Install a high pressure regulator of th...

Page 5: ...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 cont...

Page 6: ...r 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 S...

Page 7: ...o provide the correct gas flow for the burner Refer to Table 3 for the correct maximum fire manifold pressure settings If the burner lights and then loses the DC micro Amp flame signal it will retry t...

Page 8: ...r reduce the air vary the alignment between the damper and the inlet ring Minimum air shutter adjustment can be done by adjusting the three 8 18 screws on the inlet ring see Figure 5 To increase or de...

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