White Rodgers 50A56-956 Manuel d'installation télécharger pdf (Page 2)

SPECIFICATIONS

ELECTRICALRATINGS[@77°F(25°C)]:

InputVoltage: 25 VAC 50/60 Hz

Max.InputCurrent@25VAC: 0.45 amp

Relay Load Ratings:

Valve Relay: 1.5 amp @ 25 VAC 50/60 Hz 0.6 pf

Ignitor Relay: 6.0 amp @ 120 VAC 50/60 Hz (resistive)

Inducer Relay: 2.2 FLA–3.5 LRA @ 120 VAC

Circulator Relay: 14.5 FLA–25.0 LRA @ 120 VAC

Flame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 lead

TIMING SPECIFICATIONS

(Alltimesareinseconds,unlessnotedotherwise)

Event Denition 50A56-956

Pre-Purge The period of time intended to allow for the dissipation of any unburned

gas or residual products of combustion at the beginning of a furnace

operating cycle prior to initiating ignition

Trial for Ignition

Period (TFI)

The period of time between initiation of gas ﬂow and the action to

shut off the gas ﬂow in the event of failure to establish proof of the

supervised ignition source or the supervised main burner ﬂame.

Ignition Activation

Period (IAP)

The period of time between energizing the main gas valve and

deactivation of the ignition means prior to the end of TFI

Retries The additional attempts within the same thermostat cycle for ignition

when the supervised main burner ﬂame is not proven within the ﬁrst

trial for ignition period.

2 times

Recycles The additional attempts within the same thermostat cycle for ignition

after loss of the supervised ignition source or the supervised main

burner ﬂame.

Valve Sequence

Period

Valve sequence period equals 7 seconds trial for ignition period x

(1 initial try + 2 retries) + 12 seconds.

Interpurge The period of time intended to allow for the dissipation of any unburned

gas or residual products of combustion between the failed trial for

ignition and the retry period.

Post-Purge The period of time intended to allow for the dissipation of any unburned

gas or residual products of combustion at the end of a furnace burner

operating cycle. Post-purge begins at the loss of ﬂame sense.

Lockout Time ANSI standard rated module timing. 140

Heat Delay-To-Fan-On The period of time between proof of the supervised main burner ﬂame

and the activation of the blower motor at Heat speed.

Heat Delay-To-Fan-Off* The period of time between the loss of a call for heat and the

deactivation of the blower motor at Heat speed.

60/90/120*/180

Cool Delay-To-Fan-On The period of time after a thermostat demand for cool before energizing

the circulator blower motor at Cool speed.

Cool Delay-To-Fan-Off* The period of time between the loss of a call for cool and the

deactivation of the blower motor at Cool speed.

Initial Ignitor Warm-up The length of time allowed for the igniter to heat up prior to the initiation

of gas ﬂow.

Ignitor Warm-up Retries In the event of a retry, the warm-up time will be increased by one

second, up to a maximum of 27 seconds, and locked at that duration

Auto Reset After one (1) hour of internal or external lockout, the control will

automatically reset itself and go into an auto restart purge for 60 seconds.

60 minutes

Electronic Air Cleaner Ye s

Humidiﬁer Ye s

*This time will vary depending on option switch position. The control is factory set at 120 seconds HEAT delay-to-fan-off.

See OPERATION section for further information

OPERATINGTEMPERATURERANGE:

-40° to 176°F (-40° to 80°C)

HUMIDITYRANGE:

5% to 93% relative humidity (non-condensing)

MOUNTING:

Surface mount multipoise

TimingSpecs: (@ 60 Hz**)

maximum

Flame Establishing Time: 0.8 sec

Flame Failure Response Time: 2.0 sec

GasesApproved: Natural, Manufactured, Mixed, Liquiﬁed

Petroleum, and LP Gas Air Mixtures are all approved for use.

**At 50% Hz, all timing speciﬁcations should be increased by 20%

1 2 3 4 5 6 7 ... 11 12

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White Rodgers 50A56-956 Manuel d'installation Page 2

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