Midco Unipower MPG Series - Manual (Page 14)

16) Cycle the burner several times and verify:
a. 10 second initiation period
b. 90 second purge period
c. pilot ignition
b. pilot flame sensing signal is strong and stable
c. main gas ignition
d. low fire firing rate
e. high fire firing rate
f. combustion gas analyzer readings
Adjust if necessary.
17) Turn the burner power On-Off switch to OFF and remove the temporary jumper that
was placed from terminal M2 to M3. Remove the digital monometer and connectors
and replace the plugs on the main gas valve and the main manifold test tap.
Reconnect the signal input wires from the remote temperature controller.
Make sure the thermostat and operating controls are calling for heat. Defective wiring or loose
connections can simulate the component defects outlined below. Check associated wiring before
replacing a component. ELECTRICAL AND FLAME CHECKS MUST BE MADE IN THE
ORDER LISTED.
___________________________
A. No power to flame safeguard
B. Flame safeguard locked out
C. Defective flame safeguard
D. Defective motor relay
E. Motor overload "out"
A. Motor overload "out"
B. Defective motor
C. Defective flame safeguard
A. Defective air switch
B. No air pressure at air switch
C. Defective purge timer
D. Defective flame safeguard
A. No pilot gas
B. Low pilot gas pressure
C. Defective pilot gas regulator
D. Mis-adjusted pilot regulator
E. Blocked pilot regulator vent
F. Defective pilot solenoid valve
G. Defective spark electrode
H. Mis-adjusted spark electrode
I.
Defective spark cable
J. Defective spark generator
K. Clogged or incorrect pilot orifice
L. Air orifice missing
M. Clogged pilot air tube
N. Defective flame safeguard
14
IV Pilot Does
ot Light, Flame
Safeguard Locks Out
I Motor Fails
II Motor Fails to
Start, Flame,
Safeguard Energized
III Motor Runs
Continuously , o
Lighting Attempt
Trouble Chart
XVI Initial
Start Up
Instructions
2-Stage and Full
Modulating Burner
Continued
Part 2
Service
Part 1 Installation