Service Manual

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Integrated Control System
Serial numbers XL- (November 2021) and after with -895 designator
Features of Integrated Control System
• Attractive digital water heater display on control panel for setting and displaying the temperature setpoint.
Pressing temperature UP and DOWN buttons changes the temperature setpoint. The same water heater
display is used on all models. Temperature setpoint may be displayed in °F or °C.
• Single control board with plug in wiring controls temperature, ignition, and blower operation.
• Reduced number of parts for servicing and wiring.
• Burner ignition with direct spark ignition – A high voltage spark jumps from the spark rod to the burner
surface to ignite the gas. Eliminates burned out igniter replacements.
• Water heater display will show diagnostic codes in the event the water heater needs servicing. Aids in
diagnosing and servicing the water heater.
• The display can show previous error code history to further aid in servicing the water heater.
Power Supply
Dedicated 120 VAC, 60 Hz, 15A
Gas Supply
Minimum ¾" NPT
(schedule 40 black iron pipe recommended)
Approved Gas Type
Natural or Propane. Unit must match gas type supplied.
Gas Pressure (Nat &
L.P.)
Natural: 14” W.C. maximum static, 4.5” W.C. minimum running (recommended 7”
W.C. min running)
L.P. (Propane): 14” W.C. maximum static, 8” W.C. minimum running
(recommended 11” W.C. min running)
Venting System
Power vent, balanced direct vent or unbalanced direct vent. See vent tables on
page 9.
Approved Vent
Materials
PVC, CPVC, Polypropylene, or Stainless Steel
Minimum Clearance
for Servicing
18" from top, 24" from front, 4" sides and rear.
Maximum Water
Supply Pressure
150 PSI
Thermostat Sensor
11,900 Ohms @ 70°F, ECO opens @ 200°F Max., ECO close @ 120°F Min.
Redundant sensor for ECO. Sensor inside well for easy replacement of
sensor.
Control Display
Digital display, 24 volts. Temperature Range: 70-180°F. Used to set tank
temperature (°F or °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.
Transformer
120VAC primary, 24VAC secondary, 40VA.
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.
Gas Valve
Negative regulation, 24 VAC, ½" PSI max., 4.5" W.C. Minimum running inlet.
Vent Safety Switch
Normally closed, opens @ 350°F, manual reset.
Blocked Vent
Pressure Switch
24VAC, normally closed, opens when pressure increases to +2.70 W.C.
Blower
120VAC, 60Hz, 1-4 amps
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