Reznor MAPS - A,B,C Users Manual Manual de usuario descargar pdf (Pagina 30)

Form O-MAPSIII&IV Cabinets A/B/C, Page 30

4.4 Other Gas Heat Section Controls / Sensors

Location: See FIGURE 1, page 5, for location.

Function: The function of the pressure switch is to verify the cali-

bration of the air pressure sensor mounted on the ignition control

board. If the air pressure is not as required, the controller will shut

down operation of the heat section.

Service: If it is determined that the pressure switch needs replacing, use only the

factory-authorized replacement part that is designed for the model and size of gas

heater being serviced.

Combustion Air Proving Switch

The ignition board controls the entire combustion process by modulating both the gas

and the combustion air supply. Combustion air pressure switches used are listed below.

Heat Section

Size

Gas

Full Rate

Setpoint

OFF

Label

Color

Switch

P/N

Light Off (Cold) Equilibrium (Hot)

100 Nat & Pro 1.30 1.30 0.80 Gray 197078

150 Nat & Pro 1.30 1.30 0.80 Gray 197078

200 Nat & Pro 1.30 1.30 0.80 Gray 197078

250 and

JHUP-250

Natural 1.15 1.15 0.80 Gray 197078

Propane 1.30 1.30 1.05 Brown 201160

300 Nat & Pro 1.40 1.40 1.15 Brown 201160

400 Natural 2.70 2.70 1.40 Red 201159

500 Natural 2.90 2.90 1.40 Red 201159

600 Natural 3.35 3.35 2.00 White 234054

700* Natural 3.40 3.40 2.00 White 234054

JHUP-300* Natural 0.70 0.70 0.50 Orange 196388

□ *A "B" Cabinet with 500

mbh of gas heat is a Size

250 heat section plus

a Model JHUP-25 curb

section duct furnace.

Both furnaces have an

air proving switch.

□ ** A "C" Cabinet with

1000 mbh of gas heat is

a Size 700 heat section

plus a Model JHUP-30

curb section duct fur-

nace. Both furnaces

have a combustion air

proving switch.

Limit Control

Location: The limit control is located in the farthest downstream heater compartment

with the capillary sensor extending across the discharge side of the heat exchanger.

NOTE: If the installation includes an Option JHUP-30 curb section duct furnace, it also

has a limit control. See location in installation Form I-MAPSIII&IV, Paragraph 5.4.3

Function: The limit control is a temperature sensitive safety device. If the temperature

setting of the limit control is exceeded, the controller will shut down heat section opera-

tion.

Service: The limit switch will automatically reset when the temperature drops below

the setpoint. However, the cause for the limit activating should be found and corrected.

If it is determined that the limit control needs replacing, use only a factory-authorized

replacement part that is designed for that heat section.

5.0 Electric Heat

Section

Maintenance -

Models RECB,

RECC, REDB

and REDC

4.0 Gas Heat

Section

Maintenance

(cont'd)

DANGER

Safe operation requires proper venting ow. Never bypass the combustion air

proving switch or attempt to operate the heat section without the venter running

and proper ow in the vent system. Hazardous condition could result. See Hazard

Levels, page 3.

WARNING

Turn off the power locking the disconnect switch. Allow the

heating elements to cool.

CAUTION: Wearing eye protection is recommended when

cleaning the heating elements and cabinet.

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