Reznor ADFH Unit Installation Manual Manual de usuario descargar pdf (Pagina 11)

Form I-ADF, P/N 131805 R5, Page 11

FIGURE 7 - Pressure

Tap Locations for

Measuring Manifold and

Pilot Pressure

Gas Pressure Switches

Gas pressure switches included in the gas train monitor gas pressure downstream from

the safety valves. If the gas pressure at this point on a system equipped with a high gas

pressure switch (standard with Manifolds BM 78 and 79 or optional (BP2 or BP4) with

other manifolds) exceeds the setpoint, the switch will open the electrical circuit to the

burner, stopping all gas ow. The high gas pressure switch is a manual reset device.

An optional low gas pressure switch (Option BP3 or BP4) will shutoff the gas ow if the

gas pressure drops below the setpoint of the low pressure switch. The low gas pressure

switch will automatically reset when the gas pressure rises above the setpoint.

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

Pilot Supply Pressure

These systems are designed to operate on a natural gas pilot supply pressure of 3.5"

w.c. or a propane gas pilot supply pressure of 6" w.c.

Measure both operating pressure and pilot supply pressure with the blowers in opera-

tion.

Manifold Pressure

Manifold pressure is dened as the gas pressure as measured at the burner pressure

tap. Measure manifold gas pressure with the blowers operating. Minimum gas pres-

sure at the burner is typically 4.3" w.c. for natural gas or typically 1.5" w.c. for propane.

6.2 Unit Inlet Air

FIGURE 8A - Dimensions

of Outside Air Hood

Option AS2

Outside air hood is shipped

separately for eld installation.

Dimensions are the same for

all sizes.

Provide 14" (356mm)

clearance from the bottom of

the air hood to the mounting

surface.

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

6.2.1 Screened Outside Air Hood without Filters (Option AS2)

Option AS2, Screened Outside Air Hood, is a weatherized hood designed to be eld-

assembled and installed around the inlet air opening. The air hood includes a pre-

assembled louver assembly designed to help eliminate moisture from the inlet air.

Complete instructions are packaged with the air hood option.

CAUTION: It is recommended that the inlet to the outside air hood

not be facing into the prevailing wind.

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Reznor ADFH Unit Installation Manual Manual de usuario Pagina 11

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