York P*UR Installation Instructions Manual

Contents

York P*UR Installation Instructions Manual Manual pdf 25 page image

035-17477-001 Rev. A (801)Unitary Products Group 25SAFETY CONTROLSControl Circuit Fuse: A 3 amp. fuse is provided to protectthe 24 volt transformer from overload caused by control cir-cuit wiring errors. This is an ATO 3, automotive type fuse andis located on the ignition control module.Blower Door Safety Switch: This unit is equipped with anelectrical interlock switch mounted in the blower compart-ment. This switch interrupts all power at the unit when thepanel covering the blower compartment is removed.Electrical supply to this unit is dependent upon the panel thatcovers the blower compartment being in place and properlypositioned.Rollout Switch Controls: These controls are mounted onthe burner box assembly. If the temperature in the burnercompartment exceeds its set point, the igniter control and thegas valve are de-energized. The operation of this control indi-cates a malfunction in the combustion air blower, heatexchanger or a blocked vent pipe connection. Correctiveaction is required. This is a manual reset control and must bereset before operation can continue.Pressure Switches: This furnace is supplied with pressureswitches which monitor the flow through the combustion air/vent piping system. These switches de-energize the ignitioncontrol module and the gas valve if any of the following condi-tions are present. Refer to Figure 36 for tubing connections.1. Blockage of combustion air piping or terminal. (1LP)2. Blockage of vent piping or terminal (1LP).3. Failure of combustion air blower motor (1LP).4. Blockage of condensate drain piping:• Upflow units (1LP)• Downflow/Horizontal Units• Downflow (1LP)• Horizontal Left (1LP)• Horizontal Right (2LP).Limit Controls: There is high temperature limit controllocated on the furnace vestibule panel near the gas valve.This is a automatic reset control that provide over tempera-ture protection due to reduced airflow, such as a dirty filter.FIGURE 35 : Horizontal Application Condensate Drain Connection (Models P*DH / FG9-DH / G9T-DH)RIGHT AIRFLOW(INDUCER HIGH)LEFT AIRFLOW(INDUCER HIGH)1. CONDENSATE PAN TO TRAP “A” DIMENSIONS.2. INDUCER BOTTOM TO TRAP “B” DIMENSIONS.3. INDUCER OUTLET TO TRAP “C” DIMENSIONS.1. INDUCER OUTLET TO TRAP USE AS PROVIDED.5. CONDENSATE PAN TO TRAP “D” DIMENSIONS.3 1 2AD54BCHOSE IDENTIFIER NUMBERS:HOSE IDENTIFIER NUMBERS:Blower and burner must never be operated withoutthe blower panel in place.Main power to the unit must still be interrupted atthe main power disconnect switch before any ser-vice or repair work is to be done to the unit. Do notrely upon the interlock switch as a main power dis-connect.