Brochure

InstallationProcedures
WARNING:Gas-redappliancesarenotdesignedforuseinhazardousatmospherescontaining
ammable vapors or combustible dust, or atmospheres containing chlorinated or halogenated
hydrocarbons.
Installations in public garages or airplane hangars are permitted when in accordance with ANSI Z223.1 and
NFPA 54 codes or CAN1-B149 and enforcing authorities.
FOR YOUR SAFETY
What to do if you smell gas:
● Do not try to light any appliance.
● Do not touch any electrical switch; do not use any phone in your building.
● Immediately call your gas supplier from a neighbor's phone. Follow the gas supplier's instructions.
● If you cannot reach your gas supplier, immediately call your re department.
FOR YOUR SAFETY
Do not store or use gasoline or other ammable vapors and liquids in the vicinity of this or any other appli-
ance.
WARNING:Improperinstallation,adjustment,alteration,service,ormaintenancecancauseproperty
damage,injury,ordeath.Readtheinstallation,operation,andmaintenanceinstructionsthoroughly
beforeinstallingorservicingthisequipment.
Requirements for installation vary depending on the model of heater and the type of installation. Follow the
manufacturer's instructions and comply with all applicable codes.
Some venting requirements that apply to specic gas-red models are shown on the following pages.
UseonlytheReznor®powerventerdesignedfortheparticularmodelandsizeofheater.
Understand the operation before installing. When a venter is used with a heater, the room thermostat turns the
venter on and off, and the venter turns the gas controls on and off. When the space calls for heat, the room
thermostat contacts close the circuit which starts the venter. When the venter starts, air from the venter blower
closes an air switch that is built into the venter.
Closing of the air ow switch sends an electric current to the burner controls, opening the gas valve and
sending gas to the burners. When the thermostat is satised, the thermostat turns off the venter and the gas
controls. As the venter blower stops, the airow switch resets to the open position.
OPTIONAL POWER VENTING
OF GRAVITY VENTED UNITS,
IncreasesSeasonalEfciency
- Models F and B
Pilot,GasControl,andAirControlDescriptionsGas-FiredUnitHeaters
● Intermittent Spark Pilot: Automatic lighting of pilot with an electronic spark on a call for heat. Pilot gas ow
is shutoff between heat cycles. Approved for use in the United States with the natural gas supply only on
indoor and outdoor units.
● Intermittent Spark Pilot with Timed Lockout: Automatic lighting of pilot with an electronic spark on a call for
heat. Pilot gas ow is shutoff between heating cycles. Locked device stops gas ow to the pilot if the pilot
fails to light in 120 seconds. Reset of lockout requires manual interruption of the thermostat circuit. Approved
for use in the Unites States and Canada with natural or propane gas on indoor and outdoor applications.
● Direct Spark Ignition with Timed Lockout. Automatic lighting of the burner with an electronic spark on a call
for heat by the thermostat. There is no pilot. Trial for ignition is ten seconds after which, if ame is not sensed,
the unit tries for ignition again. If ignition is not proven after three attempts the unit will lockout and then auto-
matically retry after a one hour down period (ModelsUDAP,UDAS,UDBP,UDBS,LDAP,&UEASOnly).
NOTE: When installing gravity vented appliances (Model F & B) check local and state codes for requirements. Some states require the
addition of spark pilot Option AH2 or AH3.
● Single Stage: Single-stage gas valve which cycles on at 100% re on a call for heat.
● Two-Stage: Two stage gas valve which res at 100% or 50% on Models F & B; 100% or 70% on Models
UDAP, UDAS, UDBP & UDBS, as required by a remote two-stage thermostat. (Note: Two-Stage gas valve
not available on Models F & B [sizes 25 & 50 MBH] or Models UDAP, UDAS, UDBP & UDBS [sizes 30 &
45 MBH])
● Air Recirculation Kit (Single-stage units only): First stage control of thermostat energizes unit fan to recircu-
late warm stratied ceiling air. Second stage control of thermostat opens single-stage gas valve.
● Special Air Recirculation Kit (Single-stage units only): Same as the basic kit, with the addition of a manual
summer switch on thermostat for summer fan operation.
PILOT IGNITION SYSTEMS
GAS CONTROL SYSTEMS
AIR CONTROL SYSTEMS
Form RZ-C-UH (Version H) Page 37
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