Reznor YDSA Unit Installation Manual - Manual (Page 67)

Form I-Y, P/N 273646R6, Page 67
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 poisonous
gas that can cause death. NEVER RESTRICT OR OTHERWISE ALTER THE SUPPLY
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.
10.6 Checklist After
Startup:
Assumptions: All checks have been successfully performed and system is operating
properly. All panels and doors are secure.

Place "Literature/Parts Bag" containing Limited Warranty information, this
booklet, the operation/maintenance/service manual, control instructions, and any
information on optional controls in an accessible location.
The installation must obtain a temperature rise within the range specified on the fur-
nace rating plate. Depending on the model, maximum temperature rise is 50°F, 70°F,
or 100°F.
Formulas for calculating CFM:
Standard (non-condensing) heat section
CFM = (Input rate x .80) divided by (1.08 x temperature rise)
High-efficiency (condensing) heat section
CFM = (Input rate x .91) divided by (1.08 x temperature rise)
1. Set the discharge temperature heating control at its highest 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.O. to N.C. contacts, firing the
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).
 Measure manifold pressure. Follow the appropriate instructions in Paragraph
9.2.2.
 Turn the unit off and on, pausing two minutes between each cycle. Observe for
smooth ignition.
Manipulate discharge temperature setpoint up and down to see if furnace is
staging or modulating properly. NOTE: Be sure control is returned to proper
settings.
 Close all panels tightly. With the heater on, check limit control by completely
blocking off distribution air. The limit control should open within a few minutes,
shutting off the gas supply to the burner.