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Reznor YDSA Operation Manual User Manual

Page 39

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Form O-Y P/N 273647R1, Page 39

* Heat sections with dual furnaces. When only one size is listed, both furnaces are the same size and two identical high pressure

switches are used. Dual furnace heat sections with electronic modulation Option AG74 have one low pressure switch.

Combustion Air Switches for Above 6000 ft. (1830 m) - (cont’d)

Heat

Section

Option

Heat

Size(s)

(Btuh)

High Pressure Switch

Heat

Section

Option

Heat

Size(s)

(Btuh)

High Pressure Switch

Setpoint

Off

Label

Color

Switch

P/N

Setpoint

Off

Label

Color

Switch

P/N

Negative Pressure (iwc)

Negative Pressure (iwc)

H175*

75,000

1.35

Green

273554

G372* 150,000

1.35

Green

273554

100,000

1.35

Green

273554

225,000

1.35

Green

273554

H200

200,000

1.35

Green

273554

G452* 225,000

1.35

Green

273554

H202*

100,000

1.35

Green

273554

G452* 225,000

1.35

Green

273554

H300

300,000

1.45

Orange

273555

G525

225,000

1.35

Green

273554

H400

400,000

1.45

Green

273555

300,000

1.25

Blue

273553

H402*

200,000

1.35

Green

273554

G602

300,000

1.25

Blue

273553

H502*

200,000

1.35

Green

273554

300,000

1.45

Orange

273555

All gas furnaces are equipped with a temperature activated auto reset limit control.

Depending on size, the control is factory set at either 200°F or 250°F and is non-

adjustable. If the setpoint is reached, the limit control will interrupt the electric supply

to the gas valve. This safety device provides protection in the case of a lack of airflow

due to dirty filters or a restriction at the inlet or outlet.
The limit control switch is mounted on the side of the heat exchanger

Temperature Limit

Control

CAUTION: The auto reset limit control will continue to shut

down the heat section until the cause is corrected. Never by-

pass the limit control; hazardous conditions could result.

Service: If the limit switch needs to be replaced, use a factory-authorized replace-

ment designed for the application.

Combustion Air Inlet

Openings

The combustion air inlet openings are located in the doors on the control end of the

unit.
Keep all openings clean and free of obstructions.

High Temperature

Limit Control,

Auto Reset

Flame Sensor

FIGURE 27 -

Ignitor showing

required Spark

Gap Measurement

1/8 inch

(3.2mm)

Ignitor - Locate the ignitor. Disconnect the wire;

remove the screw and the ignitor. Clean the ignitor

assembly with an emery cloth.
Spark gap must be maintained to 1/8". See

FIGURE

27 shown below.

Flame Sensor - Locate the flame sensor on the

burner. Disconnect the wires; remove the screws and

the flame sensor. Clean with an emery cloth.

Ignitor

Ignitor and Flame

Sensor

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