A.O. Smith HW 610 warranty Troubleshooting, CER-TEMP 80 Recovery System Checkout Procedure

Page 47

TROUBLESHOOTING

CER-TEMP 80 RECOVERY SYSTEM CHECKOUT PROCEDURE

Use this checkout for Cer-Temp 80 Recovery Systems. (For hot water supply application only)

Checkout Sequence

System Operation

Cause

Remedy

Contact

Incorrect

 

 

 

 

 

Pump and burner remain

Tank temperature control

Replace.

 

 

(thermostat) defective.

 

 

Circulating pump and

on.

System wiring is

Correct wiring.

 

 

incorrect.

Set tank temperature

burner shut off.

 

 

control (thermostat) 20°F

 

Circulating pump on.

Pump wired for

Correct wiring.

(10°C) below tank water

With thermal balancer,

continuous operation.

 

 

temperature.

pump off delay of

 

 

 

 

Gas valve stuck or

Correct or replace

 

approximately 2 minutes.

 

 

Burner on.

defective.

valve.

 

 

 

 

System wiring is

Correct wiring.

 

 

 

 

 

 

incorrect.

 

 

 

 

 

 

 

High limit control set too

Replace. (If problem

 

 

 

low.

proven to be at this

 

 

 

High limit control

control by applying

 

 

 

differential too wide.

jumper to terminals.)

 

 

Circulating pump on.

System wiring is

Correct wiring.

 

 

incorrect.

 

 

 

 

Set tank temperature

 

 

Coil protector switch has

Remove control cover,

control (thermostat) 20°F

Circulating pump and

 

activated.

depress reset button.

(10°C) above tank water

burner on.

 

Gas valve or wiring

Check wiring. Repair or

temperature.

 

 

defective.

replace valve.

 

 

 

Power off or system

Check power supply

 

 

Circulating pump and

wiring is incorrect.

and wiring.

 

 

burner off.

Tank temperature control

Replace.

 

 

 

 

 

 

(thermostat) defective.

 

 

 

Burner on.

System wiring is

Correct wiring.

 

 

incorrect.

 

 

 

 

 

 

 

High limit control

 

Boiler outlet temperature

Circulating pump on.

Circulating pump and

defective, or set too high

Replace.

exceeds 210°F (100°C).

 

burner on.

(max. should be set at

 

 

 

 

200°F).

 

Set tank temperature

 

 

 

 

control (thermostat)

System maintains desired

 

 

 

for desired water

water temperature.

 

 

 

temperature.

 

 

 

 

47

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Contents Tennessee Waltz Parkway Ashland City, TN Models HW 300, 399, 420, 520, 610Important Definitions Safe INSTALLATION, USE and ServiceGeneral Safety Table of Contents Propane Natural Dimensions and Capacity Data27.7 33.3 Recovery CapacitiesLIQUefied petroleum gas models High Altitude InstallationsIntroduction Controls and Function GPM LPM Manual Reset High LimitHigh Limit Switch Safety Flow Switch Thermal BalancerSafety Relief Valves Tank Temperature Control Required Ability GeneralThermometers Drain Valve Not SuppliedUnconfined Space Confined Space S. InstallationsCanadian Installations AIR RequirementsLeveling Installation ClearancesTypical Boiler Installation VentingVent Connection Vent Pipe InstallationConnecting Boiler to a Common Vent Draft HoodVenting System Venting Sidewall Optional Power Vent SystemMultiple Vent Table Model HW-300 Boiler Combined Vent Sizing TablesONE Boiler Installed Independent of the Primary System System InstallationsConventional Installations LINEAR-TEMP InstallationsMinimum Branch Sizes to Boilers NO. Suggested Items for InstallationSchematic of the LINEAR-TEMPSYSTEM Boiler Inlet Outlet SizesGAS Connections Correct GAS Purging and SizingModel Rated Manifold Pressure Number Input Natural Propane ExampleSpecific Multiplier Gravity GAS Pressure RegulatorsWiring Connections WiringHW 300 thru 670. Natural and Propane GAS U.S. & Canada HW 300 toD. System Single Stage I.I.D. Honeywell GAS ValveLINEAR-TEMP Installations Boilers and Secondary Circulator are Controlled by Page MODELS, Jucntion BOX W/4 Terminals Canadian MODELS, Junction BOX W/6 TerminalsCanadian MODELS, Junction BOX W/6 Terminals Schematic MODELS, Junction BOX W/4 Terminals MODELS, Junction BOX W/4 Terminals USE this Table for Correct Pump and Water Pipe Size Wiring Figures 16 and 17 on Pages 24Piping Commercial Boiler with Vertical TankCommercial Boiler with Horizontal Tank Commercial Boiler with Vertical TANK, CER-TEMP Wiring Figures 21 to 27 on Pages 28 toHW-300 HW-399 HW-420 HW-520 Three HW-520s, HW-610s or HW-670s UP-FLOW Model USE this Table for Correct Pump and Water Pipe Size Main Burner Operation and START-UP InstructionsFilling the System Pilot and Main BurnerPilot Burner Electronic Ignition Refer to Operating at Full Input or Full Capacity Checking and Adjusting the InputConsumption Rate Stage Main Burner Operation Flame Current Sensed For Your Safety Read Before Lighting URN Pilo T Firing VA LVE Counterclockwise SET T HE Thermostat to Lowwest SettingRelief Valve General MaintenanceManual Reset High Limit Switch Continuity Test Internal Contaminants Cleaning and Flushing InstructionsPRE-TROUBLESHOOTING HOT Water Supply Boilers Preventive MaintenanceCER-TEMP 80 Recovery System Checkout Procedure TroubleshootingYES Is there excessive draft conditions that may cause pilot Burner ignition problems?Is ceramic insulator surrounding the electrode in good Condition not cracked or broken?MV & MV/PV? Replace pilot burner assembly OFF LED Status and TroubleshootingLocation of LEDs Flame LED Yellow Status LED GreenNo Call for Heat Not applicable None OFF Conditions and Exceptions Limited Warranty
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