Service Manual

Honeywell Integrated Control System
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Power supply Dedicated 120 VAC, 60 Hz, 15A
Thermostat Sensor
11,900 Ohms @ 70°F, ECO opens @ 207°F Max. Redundant sensor for ECO. Sensor inside well for easy
replacement of sensor.
Spark Rod Igniter 0.22" nominal gap to the burner surface.
Flame Sensor Output Minimum 1 micro amp, Typical range 5 to 30 micro amps.
Control Display
Digital display, 24 volts. Temperature Range: 70-180 deg. F. Used to set tank temperature (deg. F or
deg. C), show operating status, Display error codes, error code history, limit maximum setpoint
temperature.
Control Board
Operates from 24 volt from transformer. Controls tank temperature, ignition functions, combustion
blower. See ignition timings in sequence of operation for Integrated Control.
Gas Valve Negative regulation, 24 VAC, ½" PSI max., 4.5" W.C. Minimum running inlet.
Transformer 120VAC primary, 24VAC secondary, 40VA.
Blocked Vent Safety Switch Normally closed, opens @ 240°F, manual reset.
Blower 120VAC, 60Hz, .6-1 amps, 6400 RPM.
Approved Gas Type
Natural gas only. Gas supply must match the gas type listed on the water
heater rating label.
Venting System
Atmospherically Vented, Type B venting system or approved chimney. Follow
current National Fuel Gas Code requirements or in Canada, the Natural Gas
Installation Code.
Gas Supply
Minimum ¾”NPT for 300,000 BTU’s/hr. and below. Minimum 1" NPT for 399,999 BTU’s/hr.
(schedule 40 black iron pipe recommended)
Minimum Clearance
for Servicing
4" from the top, 0" from the front, 4" from the exhaust vent side, 12" from the circulation loop side, 0"
from the rear.
Maximum Water Supply
Pressure
150 PSI
Gas Pressure (Nat.) 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
Circulator Flow Switch 24 VAC, normally open, closes when circulator is operational
Circulator 120VAC , 60Hz, .76-1 amps, 3250 PRM
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