Reznor MAPS II Unit Installation Manual - Manual (Page 56)

Form I-MAPS II, Page 56
settings on the programmable control, refer to the instruction sheet in the
Literature Bag or with the Wiring Diagram.)
1. Set the discharge temperature heating control at its lowest setting.
a) Firing rate is controlled by the discharge sensor.
b) Blower motor operation is continuous.
2. On a call for gas heat
a) The venter motor is energized after 18-second (approximate) time
delay.
b) Combustion air pressure switch switches from N.C. to N.O. contacts,
firing unit. The sensing probe proves the presence of the flame at the
1st burner section.
3. If the flame is extinguished during burner operation, the ignition system
circuit board closes the main valve and must be reset by interrupting the
power to the control circuit (See Lighting Instructions on the furnace).
 Turn the unit off and on, pausing two minutes between each cycle.
Observe for smooth ignition. ( NOTE: Spark ignition occurs at 1/3 burner
section only.)
Manipulate discharge temperature setpoint up and down to see if furnace
is sequencing or modulating properly. NOTE: Be sure control is returned to
proper settings.
 Close all panels tightly. With the heater on, check limit control by com-
pletely blocking off distribution air. The limit control should open within a
few minutes, shutting off the gas supply to the burner.
DANGER: The gas burner in the optional gas-fired heat section is designed to provide
safe, complete combustion. However, if the installation does not permit the burner to
receive the proper supply of combustion air, complete combustion may not occur.
The result is incomplete combustion which produces carbon monoxide, a poison-
ous gas that can cause death. NEVER RESTRICT OR OTHERWISE ALTER THE SUP-
PLY OF COMBUSTION AIR TO ANY HEATER.
Safe operation of indirect-fired gas burning equipment requires a properly operating
vent system which vents all flue products to the outside atmosphere. FAILURE TO
PROVIDE PROPER VENTING WILL RESULT IN A HEALTH HAZARD WHICH COULD
CAUSE SERIOUS PERSONAL INJURY OR DEATH.
10.4 Checklist After
Startup:
Assumptions: All checks have been successfully performed and system is oper-
ating properly. All panels and doors are secure. The area has been cleared of
any excess supplies, scraps, and debris.

Place "Literature Bag" containing Limited Warranty information, this book-
let, the operation/maintenance/service manual (Form O-MAPS), control
instructions, and any information on optional controls in an accessible loca-
tion. Comply with the instructions on the bag.
 IMPORTANT - After at least 8 hours but no longer than a week of oper-
ation, recheck the blower wheel including all setscrews, the blower
pulley, the motor pulley, and belt tension. Make any required adjust-
ments.
Setscrew torque for pulley (sheave) is 110 in-lb minimum to 130 in-lb maxi-
mum.
Setscrew torque for bearing hub with 1-3/8 to 1-3/4" shaft is 165 in-lbs.
Socket set screw size is 5/16".
10.3.2 Startup
Checklist for Systems
with Gas Heat Module
(cont'd)
10. Commissioning
and Startup
(cont'd)
10.3 Checklist
Startup (cont'd)