Trouble chart – Midco RS40 User Manual
Page 12
Midco International Inc.
4140 West Victoria Street * Chicago, Illinois 60646
tel 773.604.8700 * fax 773.604.4070 *
web www.midco-intl.com email [email protected]
602
8471 09
Printed in USA
A.
With motor running check burner line voltage terminals for 120V as follows:
1.
Between hot and neutral-120V; voltage OK.
2.
Between hot and GND-120V: ground OK.
3.
Between strip neutral and GND-"0"V: no backfeed, OK
B.
Follow RESET procedure as specified in step II.B.
1.
Check sense electrode position per Figure 7.
2.
Check sense wire for continuity.
3.
Connect DC microameter in series with Electronic Control SENSE terminal and
sensor wire. With flame on, flame signal should be at least 2 microamps.
_____________________________________
A.
Low manifold gas pressure.
B.
Main gas spud orifice too small.
C.
Primary air adjustment open too far.
_____________________________________
A.
High manifold gas pressure.
B.
Main gas spud orifice too large.
C.
Primary air adjustment closed too far.
D.
Dirty blower wheel.
_____________________________________
A.
Automatic electric (redundant) valve section of Combination Valve is defective and entire
valve must be replaced.
_____________________________________
* Normal low voltage:
Motor running-24V minimum.
Combination Valve energized-21V minimum.
**
CAUTION: If changes are made in the Main Gas Spud Orifice size, Manifold Gas
Pressure or Primary Air Adjustment, change the installation Data Tag accordingly.
Trouble Chart
Trouble Chart Continued
IV. Short Flame.**
V. Long Hazy Flame.**
VI. Gas Fails to Shut Off.
III. Flame on Only During 6-
Second Trial for Ignition