Reznor SHH (Indoor PreevA) Unit Installation Manual - Manual (Page 65)

Form I-PDH/SDH/PEH/SHH/PXH, Page 65
DANGER:
Incomplete Combustion: The gas burner in Model PDH, SDH, and SHH gas-
fired equipment 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.
Improper Venting: 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.
On separated combustion Model SDH and SHH heaters, install either the
horizontal or vertical combustion air/vent system illustrated in the heater
venting manual, using the concentric adapter supplied. For all gas-fired heater
installations, always comply with the combustion air requirements in the
installation codes and instructions. Model PDH units installed in a confined
space must be supplied with air for combustion as required by Code and in the
heater installation manual. 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. MAINTAIN THE
VENT OR VENT/COMBUSTION AIR SYSTEM IN STRUCTURALLY SOUND AND
PROPER OPERATING CONDITION.
Operating and Heating Sequence - Electric Heat Model PEH
Turn on power to the unit.
- Outside air dampers open.
- Damper end switch closes energizing the blower motor.
- Unit is controlled by FX06 controller (with sensors in outside and discharge air.)
- Temperature control staging is based on sensor setpoints and inputs.
Electric Heating Sequence:
1) On a call for heat from the FX06 controller, the blower energizes.
2) Supply air switch closes and the first stage of electric heat is energized.
3) Subsequent staging is controlled by the FX06 controller (Option D12E) or by the
FX06 controller with modulation control from the SCR power controller (Option
D12D).
 Vent System Testing Procedure - Model PDH
1. Seal any unused openings in the venting system.
2. Inspect the venting system for proper size and horizontal pitch, as required in
the National Fuel Gas Code, NFPA54/ANSI Z223.1 (latest edition) or CAN/CSA
B149.1 Natural Gas and Propane Codes, and the Model PDH venting manual
(Form I-PDH-V). Determine that there is no blockage or restriction, leakage,
corrosion or other deficiencies that could cause an unsafe condition.
3. In so far as practical, close all building doors and windows and all doors
between the space where the heater is and other spaces of the building. Turn