White Rodgers 50T35-743 Installation Instructions Manual

Also see for 50T35-743: Installation instructions Installation instructions

Contents

2SPECIFICATIONSELECTRICAL RATINGS [@ 77°F (25°C)]:Input Voltage: 25 VAC 60 HzMax. Input Current @ 25 VAC: 0.5 amp + MV LoadRelay Load Ratings:Valve Relay: 1.5 amp @ 24 VAC 60 Hz 0.6 pfIgnitor Relay: 5.0 amp @ 120 VAC 60 Hz(resistive)Circulator Relay: 11 FLA–26.0 LRA @ 120 VACFlame Current Requirements:Minimum current to insure flame detection: 1 μa DC*Maximum current for non-detection: 0.1 μa DC*Maximum allowable leakage resistance: 100 M ohms*Measured with a DC microammeter in the flame probe leadOPERATING TEMPERATURE RANGE:-40° to 175°F (-40° to 80°C)HUMIDITY RANGE:5% to 93% relative humidity (non-condensing)MOUNTING:Surface mount multipoiseTiming Specs:maximumFlame Establishing Time: 0.8 secFlame Failure Response Time: 2.0 secGases Approved: Natural, Manufactured, Mixed, LiquifiedPetroleum, and LP Gas Air Mixtures are all approved for use.Timing Specifications(All times are in seconds, unless noted otherwise)Timing Specification Description 50T35-743Pre-Purge Initial delay between thermostat contact closure and trial for ignition. 15Initial Ignitor Warm-Up Duration of ignitor warm-up time on the first 64 attempts. 15Retry Ignitor Warm-Up Duration of ignitor warm-up time if the control retries. 20Ignition ActivationPeriodThe period of time between energizing the main gas valve anddeactivation of the ignition means prior to the lockout time.5Trial for Ignition Period during which the valve and ignition source is activated, attemptingto ignite gas at the burner.7Retries Additional ignition attempts if the original ignition attempt is unsuccessful. 2 timesValve SequencePeriodValve sequence period is the cumulative total amount of time that the gasvalve is energized before entering lockout.12Inter-Purge Period between trials for ignition when both the gas valve and ignitionsource are deactivated to allow unburned gas to escape before the nexttrial30Post-Purge After all ignition cycles are complete, the control will enter post-purge.The combustion fan will remain on to allow unburned gas to escape. Afterpost-purge is complete, the combustion fan will turn off.25/29(90+ option)Lockout Time The period of time between initiation of gas flow and the action to shutoff the gas flow in the event of failure to establish proof of the supervisedignition source or the supervised main burner flame. Reinitiating thelighting sequence requires a manual operation if ignition is requiredbefore Auto reset.300Heat Delay to Fan On Timing to allow the heat to build up in the plenum before turning on the fan. 30Heat Delay to Fan Off Timing to allow the fan to run after the call for heat ends. This allowsresidual heat to be removed from the heat exchanger and distributed tothe conditioned space.90/120/150Cool Delay to Fan On Timing to allow the cooling coil to cool off before turning on the fan. 5Cool Delay to Fan Off Timing to allow the fan to run after the call for cool ends. This allowsresidual cooling capacity to be removed from the cooling coils anddistributed to the conditioned space.60Auto Reset If shutoff occurs, the control delays for a specific recycle delay periodbefore beginning another trial for ignition (models with retries only).60 minutes*These times will vary depending on option switch position. See INSTALLATION section for further information.