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LAARS U.H.E. - Service Manual User Manual

Page 6

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LAARS Heating Systems

Page 6

6

Thermostat Sensor

11,900 Ohms @ 70°F, ECO opens @ 201°F Max., ECO close @ 100°F Min.

Thermostat Board

Max temp 180°F, Min temp 91°F, 24VAC, 60Hz max.

Hot Surface Igniter

120VAC, 30-120 ohms @ room temperature.

Flame Sensor Output

Minimum 1 micro amp, Typical range 4 to 7 micro amps.

Temperature Dial

Min. set point 5400-6600 ohms, Max set point 0-50 ohms.

Ignition Module

See page 9

Gas Valve

Negative regulation, 24 VAC, ½" PSI max., 4.5" W.C. Minimum running inlet.

Transformer

120VAC primary, 24VAC secondary, 40VA.

Vent Safety Switch

Normally closed, opens @ 350°F, manual reset.

Blower

120VAC, 60Hz, .6-1 amps, 6400 RPM.

Power supply

Dedicated 120 VAC, 60 Hz, 15A, GFI

Approved Gas Type

Natural or Propane. Unit must match gas type supplied.

Venting System

Power vent, balanced direct vent or unbalanced direct vent. See vent tables on page 7

Approved Vent Materials

PVC, CPVC or ABS

Gas Supply

Minimum 1" NPT for UHE100T399, all others ¾" NPT

(schedule 40 black iron pipe recommended)

Minimum Clearance

for Servicing

18" from top, 24" from front, 4" sides and rear.

Maximum Water Supply

Pressure

150 PSI

Gas Pressure (

Nat & L.P.

) 14.0" W.C. maximum static, 4.5" W.C. minimum running (recommend 7.0" W.C. min running)

Combustion Levels

CO2: 10-11%, CO: less then 0.04 percent (400 PPM) air free

Blocked Vent Pressure

Switch

24VAC, normally closed, opens when pressure increases to +2.70 W.C.