30
RP-HRPD-IOM (07-22) 132210-B
Post-Startup Checklist
Observe burner flame at full fire . Natural gas flame should be about 1-1/2 inches in height with blue coloring .
Propane gas flame should be approximately same height with blue coloring . Yellow tipping may appear on propane
gas . If yellow extends beyond 1/2- to 3/4-inch, adjust air shutters (refer to
section) . If shutter adjustment does not reduce yellowing, check for gas leaks at control manifold or orifice fitting .
Turn unit OFF and ON, pausing 2 minutes between each cycle . Observe to verify smooth ignition . On two-stage or
modulating burner systems, manipulate temperature adjustment slowly up and down to see if control is sequencing
or modulating properly . Raising temperature setting drives burner on or to full fire .
Using manometer or slant gauge readable up to 14 IN WC, check orifice manifold for operating pressure on full
fire . Natural gas should be 3 .5 IN WC at this point . Propane gas should be 10 IN WC at this point . Variations
from these pressures are not recommended as ignition and efficiency performance can be adversely affected by
improper pressure adjustment (refer to
Measure and Adjust Manifold (Outlet) Gas Pressure
section) .
Place owner’s envelope containing Limited Warranty Card, this manual, and any optional information in accessible
location near heater . Follow instructions on envelope .
⚠ DANGER ⚠
• The gas burner in this gas-fired equipment is designed and equipped to provide safe, controlled,
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 poisonous gas that can cause death.
• Safe operation of indirect-fired gas burning equipment requires a properly-operating vent system
that vents all flue products to the outside atmosphere. FAILURE TO PROVIDE PROPER VENTING
WILL RESULT IN A HEALTH HAZARD THAT COULD CAUSE SERIOUS PERSONAL INJURY OR
DEATH.
• Always comply with the combustion air requirements in the installation codes and instructions.
• Combustion air at the burner should be regulated only by manufacturer-provided equipment.
NEVER RESTRICT OR OTHERWISE ALTER THE SUPPLY OF COMBUSTION AIR TO ANY HEATER.
OPERATION—CONTINUED
Startup
1 . Close all panels tightly .
2 . Turn ON electric and gas supply to furnace .
3 . Adjust thermostat or ductstat so that call for heat exists .
4 . Observe for complete sequencing of safety pilot and ignition (refer to
) .
Table 19. Sequence of Operation
Step
Action
Observe
1
Set thermostat at its lowest setting
2
Turn ON electric and main
and manual gas valves
Firing rate is controlled by thermostat
Blower motor operates from fan time delay
3
Set thermostat at desired
setting—thermostat calls for
heat
Venter motor is energized after 15-second (approximate) time delay
Venter flow switches from NC to NO contacts to energize pilot gas valve and spark gap to produce
pilot flame on each operating cycle
Sensing probe proves presence of pilot flame and energizes safety switch portion of control to
deenergize spark gap and energize main valve
Main gas ignites and unit fires at full rate
4
If flame is extinguished during
main burner operation, safety
switch closes main valve and
recycles spark gap
On unit equipped with controller with lockout, if pilot is not established within 120 seconds
(approximately), unit locks out for 1 hour unless reset by interrupting power to control circuit
