A.O. Smith 710 ASME Service Manual
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A.O. Smith 710 ASME Service Manual

A.O. Smith 710 ASME Service Manual

On-demand water heater
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CONFIDENTIAL
710 / 710 ASME Service manual
Ver. 1.00
710 / 710 ASME
On-demand Water Heater
Service manual
710 models
A.O. Smith Water Products Company
500 Tennessee Waltz Parkway
Ashland City, TN 37015
Toll Free: 1-877-737-2840
1

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Summary of Contents for A.O. Smith 710 ASME

  • Page 1 CONFIDENTIAL 710 / 710 ASME Service manual Ver. 1.00 710 / 710 ASME On-demand Water Heater Service manual 710 models A.O. Smith Water Products Company 500 Tennessee Waltz Parkway Ashland City, TN 37015 Toll Free: 1-877-737-2840...

  • Page 2: Table Of Contents

    CONFIDENTIAL 710 / 710 ASME Service manual Ver. 1.00 Table of Contents 1. Specifications………………………………………...…...………….……………………...………………………… 2. Exterior view…………………………………………………………………………………………………………….. 3. Interior view….………………………………………………………………………………………………………….. 4. List of main components in the interior view………………………………….…………………………. 5. Schematic diagram…………………………………………………………………………………………..……….. 6. Wiring diagram…………………….………………………………………………………………………..…………. 7. Wiring diagram checkpoints for diagnosis……………………………………………………………….…...

  • Page 3: Specifications

    CONFIDENTIAL 710 / 710 ASME Service manual Ver. 1.00 1. Specifications Unit Model 710 / 710 ASME Unit dimensions H 23.6"×W 18.5"×D 8.9" Weight 59 lbs. 240,000 INPUT BTU/h 24,000 Combustion System Power vent Installation Indoor, Outdoor, Direct vent Fan motor PWM Turbo fan LP 3.4”...

  • Page 4: Exterior View

    CONFIDENTIAL 710 / 710 ASME Service manual Ver. 1.00 2. Exterior view Side view Front view 1 8 - 1 / 2 " ( 4 7 0 m m ) 8 - 7 / 8 " ( 2 2 6 m m ) 1 5 - 3 / 4 "...

  • Page 5: Interior View

    CONFIDENTIAL 710 / 710 ASME Service manual Ver. 1.00 3. Interior view...

  • Page 6: List Of Main Components In The Interior View

    CONFIDENTIAL 710 / 710 ASME Service manual Ver. 1.00 4. List of main components in the interior view Items# in Common parts Description components Part # For other models diagram Case assembly 319143-287 Manifold assembly with gas 319143-305 (LP model)
  • Page 7 CONFIDENTIAL 710 / 710 ASME Service manual Ver. 1.00 Items# in Common parts Description components Part # For other models diagram Outlet drain plug 319143-079 Air-fuel ratio rod (AFR rod) 319143-035 520, 310, 510, 910 Flame rod 319143-035 520, 310, 510, 910...

  • Page 8: Schematic Diagram

    CONFIDENTIAL 710 / 710 ASME Service manual Ver. 1.00 5. Schematic diagram Exhaust Air-fuel ratio rod Heat Exchanger Flame rod Hi-limit switch Output Thermistor O.H.C.F Igniter rod Fan motor Burner Igniter Water control valve Gas solenoid valve 3 Gas solenoid valve 1...

  • Page 9: Wiring Diagram

    CONFIDENTIAL 710 / 710 ASME Service manual Ver. 1.00 6. Wiring diagram BK: BLACK LB:LIGHT BLUE G: GREEN O: ORANGE P: PURPLE BL: BLUE Y: YELLOW BR:BROWN W: WHITE R: RED GY:GRAY Propor- tional Water Valve Control Flow valve Sensor...

  • Page 10: Wiring Diagram Checkpoints For Diagnosis

    CONFIDENTIAL 710 / 710 ASME Service Manual Ver. 1.00 7. Wiring diagram check points for diagnosis Check- Parts and Description Color of wires Normal Range point White – Black (A) A, A1 100 V Power supply 90 to 110 VAC Brown –...
  • Page 11 CONFIDENTIAL 710 / 710 ASME Service Manual Ver. 1.00 Check- Parts and Description Color of wires Normal Range point Red - Black 4 to 5.5 VDC Flow sensor White(+) – Black(GND) 1 to 4 VDC (1,200 Pulse/min) Yellow – AFR rod More than 0.5 μA...

  • Page 12: Resistance Values Of The Temperature Thermistors

    CONFIDENTIAL 710 / 710 ASME Service Manual Ver. 1.00 8. Resistance values of the temperature thermistors Resistance values at different temperatures ºF Temperature ºC Resistance kΩ 23.76 19.08 15.43 12.56 10.28 8.47 7.02 5.85 4.90 4.12 Temperature ºF ºC Resistance kΩ...

  • Page 13: Operational Flow Chart

    CONFIDENTIAL 710 / 710 ASME Service Manual Ver. 1.00 9. Operational flow chart Power supply ON FAV&BV open Operation SW ON Remove cause Opeartion lamp OFF Operation stop Pre-check NORMAL? False Dipswitch 031 blink settings InTH failure 321 blink OuTH failure...

  • Page 14: Component Specifications

    CONFIDENTIAL 710 / 710 ASME Service Manual Ver. 1.00 10. Component specifications 10-1. Burners……………………..…………………………………………….………………………..………. 15 10-2. Gas manifold…………….…………………………..…………………………………………………..16 10-3. Fan motor……………………………………………………………………….………………………...… 17 10-4. Gas valve assembly……………………………………….……………………………………….……. 18 10-5. Flame rod………………………………………………………….………………………………………… 10-6. AFR rod……………………………………………………………………………..………………………… 20 10-7. Heat exchanger……………………………………………………………..………………….……… 10-8. Flow sensor…………………………………………………………………………………………………. 22 10-9.

  • Page 15: Burners

    CONFIDENTIAL 710 / 710 ASME Service Manual Ver. 1.00 10-1. Burners Unit Part # #101 AOS Part # 319143-299 Checkpoint There are 2 types of burners in the water heater: the gas-rich burner stabilizes the flames within the combustion chamber and the air-rich burner Function produces more heat in the combustion chamber.

  • Page 16: Gas Manifold

    CONFIDENTIAL 710 / 710 ASME Service Manual Ver. 1.00 10-2. Gas manifold 319143-305 (LP model) Unit Part # #120 AOS Part # Checkpoint 319143-306 (NA model) 1. The manifold distributes gas from the gas valves to the burners. The manifold has two types of the nozzles: one type for gas-rich burners (20...

  • Page 17: Fan Motor

    CONFIDENTIAL 710 / 710 ASME Service Manual Ver. 1.00 10-3. Fan motor Unit Part # #115 AOS Part # 319143-043 Checkpoint To provide combustion air into the combustion chamber and to exhaust Function flue gas. 1. Fan speed failure, causing abnormal sounds with or without combustion during operation.

  • Page 18: Gas Valve Assembly

    CONFIDENTIAL 710 / 710 ASME Service Manual Ver. 1.00 10-4. Gas valve assembly 319143-305 (LP model) Unit Part # #120 AOS Part # Checkpoint C,H1 319143-306 (NA model) Opens and closes the gas pathways of the water heater (main and solenoid...

  • Page 19: Flame Rod

    CONFIDENTIAL 710 / 710 ASME Service Manual Ver. 1.00 10-5. Flame rod Unit Part # #106 AOS Part # 319143-035 Checkpoint To detect flames while the water heater is in operation. Function 1. Unable to detect flames when flames actually do occur Failure event 2.

  • Page 20: Afr Rod

    CONFIDENTIAL 710 / 710 ASME Service Manual Ver. 1.00 10-6. AFR rod Unit Part # #106 AOS Part # 319143-035 Checkpoint -Checks flame conditions during combustion. Function -When AFR rod detects unexpected flame conditions, the the computer of the water heater makes adjustments in the fan motor speed to compensate.

  • Page 21: Heat Exchanger

    CONFIDENTIAL 710 / 710 ASME Service Manual Ver. 1.00 10-7. Heat exchanger 319143-302 #210 (Regular model) Check (Regular model) Unit Part # AOS Part # 319143-314 #211 (ASME model) point (ASME model) Absorbs heat from combustion and transfer it to water through the heat Function exchanger pipes.

  • Page 22: Flow Sensor

    CONFIDENTIAL 710 / 710 ASME Service Manual Ver. 1.00 10-8. Flow sensor Unit Part # #429 AOS Part # 319143-092 Checkpoint Detects and measures water flow rate using a spinning impeller and magnetic Function pick-up. Unable to detect or measure any water flow rate.

  • Page 23: Water Control Valve

    CONFIDENTIAL 710 / 710 ASME Service Manual Ver. 1.00 10-9. Water control valve (flow adjustment valve and bypass valve) Unit Part # #423 AOS Part # 319143-086 Checkpoint The water control valve in the water heater has three functions of water control: flow adjustment, bypass, and two-way) This valve is exactly the same as the water valve in the 910.
  • Page 24 CONFIDENTIAL 710 / 710 ASME Service Manual Ver. 1.00 10-9. Water control valve (flow adjustment valve and bypass valve) Blue-Brown 13.0 to 16.0 VDC Color / Number of Orange-Brown ON: 12.5 to 16.0 VDC OFF: 0 to 1 VDC wires Red-Brown (0°...

  • Page 25: Thermistors

    CONFIDENTIAL 710 / 710 ASME Service Manual Ver. 1.00 10-10. Thermistors #422 (Inlet) 319143-085 (Inlet) E1 (Mixing) Unit Part # #433 (Output) AOS Part # 319143-096 (Output) Checkpoint E2 (Output) #418 (Mixing) 319143-081 (Mixing) E3 (Inlet) Measure cold / hot water temperatures in the water heater.

  • Page 26: Hi-Limit Switch

    CONFIDENTIAL 710 / 710 ASME Service Manual Ver. 1.00 10-11. Hi-limit switch Unit Part # #432 AOS Part # 319143-095 Checkpoint -Based on bi-metal thermal expansion. -Detects excessively high water temperature (more than 194˚F or 90˚C) in pipes of the heat exchanger.

  • Page 27: Overheat Cutoff Fuse

    CONFIDENTIAL 710 / 710 ASME Service Manual Ver. 1.00 10-12. Overheat cutoff fuse Unit Part # #403 AOS Part # 319143-286 Checkpoint The overheat cutoff fuse contains solder with a melting point of 430˚F (221˚C). Detects excessive temperatures within the water heater, especially around Function the heat exchanger and combustion chamber.

  • Page 28: Freeze Protection Heaters

    CONFIDENTIAL 710 / 710 ASME Service Manual Ver. 1.00 10-13. Freeze protection heaters #404 319143-224 #410 319143-068 Unit Part # AOS Part # Checkpoint #415 319143-078 #426 319143-321 Prevents the heat exchanger, water valves, and water pipes within the water Function heater from freezing.

  • Page 29: Computer Board

    CONFIDENTIAL 710 / 710 ASME Service Manual Ver. 1.00 10-14. Computer board Unit Part # #701 AOS Part # 319143-279 Checkpoint Controls the functions of the most parts in the water heater. Function Malfunctioning computer Failure event When the computer board failed, the control from the computer and/or the multi-system control will be abnormal.

  • Page 30: Transformer

    CONFIDENTIAL 710 / 710 ASME Service Manual Ver. 1.00 10-15. Transformer Unit Part # #702 AOS Part # 319143-309 Checkpoint A1,A2 -To transform input voltage from 120 to 100 VAC. -Every electrical component of the water heater is designed to only work...

  • Page 31: Gfi

    CONFIDENTIAL 710 / 710 ASME Service Manual Ver. 1.00 10-16. GFI Unit Part # #712 AOS Part # 319143-227 Checkpoint A,A1 -Detects electrical leakage in the water heater. Function -Stops providing power to the water heater in the case of electrical leakage.

  • Page 32: Igniter

    CONFIDENTIAL 710 / 710 ASME Service Manual Ver. 1.00 10-17. Igniter Unit Part # #125 AOS Part # 319143-052 Checkpoint -To ignite the gas / air mixtures when the water heater is ready to burn gas Function on its burner surface.

  • Page 33: Freeze Protection Thermostat

    CONFIDENTIAL 710 / 710 ASME Service Manual Ver. 1.00 10-18. Freeze protection thermostat Unit Part # #117 AOS Part # 319143-185 Checkpoint Temperature detecting device which prevents the pipes within the water heater from freezing. When this device detects temperatures below Function 36.5˚F (2.5˚C) inside the water heater, power is supplied to the electric...

  • Page 34: Surge Box

    CONFIDENTIAL 710 / 710 ASME Service Manual Ver. 1.00 10-19. Surge box Unit Part # #715 AOS Part # 319143-284 Checkpoint A2,A3 Protects the unit from high voltage and/or high electric current caused by lightning. Function There are 2 types of surge absorbers in the water heater Surge absorber A is activated by voltage higher than 220 V, the other one is activated by voltage higher than 680 V.

  • Page 35: Fault Analysis & Specifications

    CONFIDENTIAL 710 / 710 ASME Service Manual Ver. 1.00 11. Fault Analysis & Specifications Remarks: 1. Proper range of values of voltage & resistance shown below. 2. Please refer to the wiring diagram for checkpoint positions. 3. Remove power to water heater when checking for continuity, disconnections, resistance values, etc.
  • Page 36 CONFIDENTIAL 710 / 710 ASME Service Manual Ver. 1.00 Natural of Fault Diagnosis Checkpoint 5 Check that the filter on the cold water inlet is clean. ・The hot water is not 6 Check whether or not the unit is frozen.
  • Page 37 CONFIDENTIAL 710 / 710 ASME Service Manual Ver. 1.00 Natural Diagnosis Checkpoint Fault 4 Fault of PCB in the water heater ・ Fluctuation [1] No voltage to gas solenoid valve (SV of hot water Normal: 78 to 100 VDC between COM (blue) & #9 (green)
  • Page 38 CONFIDENTIAL 710 / 710 ASME Service Manual Ver. 1.00 Error Code Diagnosis Checkpoint 8 Check if there is dust and lint in burner and heat exchanger, when the water heater has been installed in laundry room. 9 Check if there is grease and dirt in burner and fan motor, when the water heater has been installed in restaurant.
  • Page 39 CONFIDENTIAL 710 / 710 ASME Service Manual Ver. 1.00 Error Code Diagnosis Checkpoint 6 Disconnected / damaged hi-limit switch. (Refer to section 10-11) V isual inspection: connection / breakage of wires. Normal: 1 Ω or less between blue & blue...
  • Page 40 CONFIDENTIAL 710 / 710 ASME Service Manual Ver. 1.00 Error Code Diagnosis Checkpoint 5 Disconnected / damaged O.H.C.F. (Refer to section 10-12) V isual inspection: connection / breakage of wires. Error code is Normal: 1 Ω or less between blue & blue shown after 6 Check if hi-limit switch is properly functioning.
  • Page 41 CONFIDENTIAL 710 / 710 ASME Service Manual Ver. 1.00 Error Code Malfunction description Cancellation method Disconnected AFR rod Turn off the power or water supply Diagnosis Checkpoint 1 AFR rod fault (Refer to section 10-6) V isual inspection: connection / breakage of wires, soot on it.
  • Page 42 CONFIDENTIAL 710 / 710 ASME Service Manual Ver. 1.00 Error Code Malfunction description Cancellation method Fault of driving circuit for any of the gas solenoid valves (SV , SV , and/or SV Turn off the power supply (The computer checks the condition of the...
  • Page 43 CONFIDENTIAL 710 / 710 ASME Service Manual Ver. 1.00 Error Code Malfunction description Cancellation method Pump failure Turn off the power Diagnosis Checkpoint 1 Check whether the pump connected to PCB works properly. Error Code Malfunction description Cancellation method Water control valve fault...
  • Page 44 CONFIDENTIAL 710 / 710 ASME Service Manual Ver. 1.00 Error Code Malfunction description Cancellation method 1 PCB fault [1] Fault of preparation for the mixing thermistor operation. Turn off the power or water supply [2] Fault of driving circuit for Gas Proportional...
  • Page 45 CONFIDENTIAL 710 / 710 ASME Service Manual Ver. 1.00 Error Code Malfunction description Cancellation method Restoring proper cable connections between all the 710 models and the multi-unit controller (9007675005). When Miscommunication between Parent and Child the computer detects proper connections units for Easy-Link systems or Multi-Unit system.

  • Page 46: Controls And Settings

    CONFIDENTIAL 710 / 710 ASME Service Manual Ver. 1.00 12. Controls and settings 12-1. Diagnosis using the remote controller………………..………….….…………….….……...…..……….….……… 47 12-2. The error-call button: Verifying functionality of computer board, Displaying error code history, and Clearing error code history memory…………….………………………….…………………………. 12-3. Clearing the “101” and “991”error code…………………………………………………………………………………. 51 12-4.

  • Page 47: Diagnosis Using The Remote Controller

    CONFIDENTIAL 710 / 710 ASME Service Manual Ver. 1.00 12-1. Diagnosis using the remote controller <Individual unit> 1. Press the "HOT" button and the "COLD" button simultaneously for “HOT” “TIME” at least 5 seconds to enter “Diagnostic mode”. “COLD” Button Button 2.
  • Page 48 CONFIDENTIAL 710 / 710 ASME Service Manual Ver. 1.00 < For multiple units in the Multi-unit system and the Easy-Link system > 1. Press and hold the "HOT" and "COLD" buttons simultaneously for at least 5 seconds to enter “Diagnostics Mode”.
  • Page 49 CONFIDENTIAL 710 / 710 ASME Service Manual Ver. 1.00 Description of mode numbers in “Diagnostics Mode” Mode # Whole multi-unit system information (#0) Unit information (#1 to #20) Total system rate 0 to 9,999 (×0.1 GPM) Total operation time 0 to 9,999 (×10 hours) ON/OFF cycles 0 to 9,999 (×100 times)

  • Page 50: The Error-Call Button: Verifying Functionality Of Computer Board, Displaying Error Code History, And Clearing Error Code History Memory

    CONFIDENTIAL 710 / 710 ASME Service Manual Ver. 1.00 12-2. The error-code button: Verifying functionality of computer board, Displaying error code history, and Clearing error code history memory The 710 has the “Error-call button” on the computer board that provides three main functions listed below.

  • Page 51: Clearing The "101" And "991"Error Code

    CONFIDENTIAL 710 / 710 ASME Service Manual Ver. 1.00 12-3. Clearing the “101” and “991” error code The “101” and “991” error codes signify imperfect (abnormal) combustion, caused by insufficient intake air and/or obstructions in the exhaust. If the “101” and “991” error code occurs, please check the following: 1.

  • Page 52: Afr Rod Function

    CONFIDENTIAL 710 / 710 ASME Service Manual Ver. 1.00 12-4. AFR rod function <Function> The AFR rod checks flame conditions during combustion. When the AFR rod detects unexpected flame conditions, the computer board of the 710 models adjusts the fan motor speed to ensure that air and fuel are always at a proper mixture ratio, minimizing emissions.

  • Page 53: Dipswitch Settings

    12-5. Dipswitch settings Right bank of dipswitches The 710 shares the computer board with the 710 ASME. There are two banks of dipswitches (right and left bank) on the computer board. The right bank has certain special functions as shown on the following table and generally should not need adjustment.
  • Page 54 CONFIDENTIAL 710 / 710 ASME Service Manual Ver. 1.00 The functions of the left dipswitch bank Functions and Dipswitch settings Output temperature settings (See the table below) (Default 120 °F) 120 F 100 F 115 F 135 F 145 F...

  • Page 55: Assigning Unit Numbers In The Easy-Link System

    CONFIDENTIAL 710 / 710 ASME Service Manual Ver. 1.00 12-6. Assigning unit numbers in the Easy-link system How to display the unit number Press the “Unit # display” button on the computer board. The 7-seg LED will then display the assigned number for that 710 unit for 10 sec.

  • Page 56: A) On/Off Conditions: Overview

    CONFIDENTIAL 710 / 710 ASME Service Manual Ver. 1.00 12-7. (A) ON/OFF conditions: Overview The following table shows the ON/OFF conditions of the water heater. ON / OFF Conditions For Every pump modes The BTU requirement is more than 14,880 BTU/h Conditions needed to turn ON.

  • Page 57: B) On/Off Conditions: Btu Requirements

    CONFIDENTIAL 710 / 710 ASME Service Manual Ver. 1.00 12-7.(B) ON/OFF conditions: BTU requirements alculating the ON/OFF conditions of the 710 A. C 【Condition needed to turn the 710 ON】 – T ) × GPM × 500 > 14,880 【Condition needed to turn the 710 OFF】...

  • Page 58: A) Pump Control On / Off Condition (Only For Single And Easy-Link System)

    CONFIDENTIAL 710 / 710 ASME Service Manual Ver. 1.00 12-8. (A)Pump control ON / OFF Conditions (Only for single and Easy-link system) To run circulation pumps efficiently and effectively, the 710 offers four different modes of pump control. The following table shows the pump control ON/OFF conditions for different modes. To change pump control modes, see section 12-5 for dipswitch settings.

  • Page 59: B) Pump Control On/Off Conditions: Btu Requirements For Re-Circulation Mode

    CONFIDENTIAL 710 / 710 ASME Service Manual Ver. 1.00 12-8. (B) Pump control ON/OFF conditions: BTU requirements for Re-circulation mode A. Calculating the ON/OFF conditions of the pump 【Condition needed to turn the pump ON】 – T ) × GPM × 500 > 14,880 【Condition needed to turn the pump OFF】...

  • Page 60: Multi-Unit System On / Off Conditions

    CONFIDENTIAL 710 / 710 ASME Service Manual Ver. 1.00 12-9. Multi-unit system ON / OFF conditions In Easy-link system and Multiple-system, the amount of 710 models called on to activate depends on the FLOW RATE and the SET TEMPERATURE. 1. Condition required to activate an additional 710: Flow rate required to activate additional 710 = A ×...
  • Page 61 CONFIDENTIAL 710 / 710 ASME Service Manual Ver. 1.00 3. Example: Set temperature = 120˚F in a 20-unit system and priority unit is No. 1 (See the table below) To activate additional 710 models To reduce number of activated 710 models...

  • Page 62: Operation Time For Unit Rotation

    CONFIDENTIAL 710 / 710 ASME Service Manual Ver. 1.00 12-10. Operation time for unit rotation The unit that turns on first is whichever unit the 710 decides is the primary unit. The priority unit will rotate when it reaches 100 ON / OFF cycles or after 12 hours of operation.

  • Page 63: Individual Unit Operation In Multiple-System While The Multi-Unit Controller (Part # 9007675005) Is Under Abnormal Conditions (Individual Operation Mode)

    CONFIDENTIAL 710 / 710 ASME Service Manual Ver. 1.00 12-11. Individual unit operation in multiple-system while multi-unit controller (Part # 9007675005) is under abnormal conditions (Individual operation mode) A multi-unit system of 710 models requires the multi-unit controller. If the multi-unit controller undergoes abnormal conditions, the 710 models can operate as individual units.

  • Page 64: High Altitude Region Support Software (Fm+ And Input-)

    CONFIDENTIAL 710 / 710 ASME Service Manual Ver. 1.00 12-12. High-Altitude Region Support Functions (FM+ and INPUT-) ＜Using this function＞ The high-altitude region support functions have three operation levels, with the appropriate level being set up by the installer until the abnormal sound problem is solved.

  • Page 65: Checking The Flow Rate By Computer Board

    CONFIDENTIAL 710 / 710 ASME Service Manual Ver. 1.00 12-13. Checking the Flow Rate by Computer Board ＜Function＞ This function offers a method for checking the flow rate in the water heater’s troubleshooting operations without having to use the remote controller.

  • Page 66: Relay Selection For The Pump Control Connection

    CONFIDENTIAL 710 / 710 ASME Service Manual Ver. 1.00 12-14. Relay selection for the pump control connection The maximum current capacity of the 710 models pump control connection is 1 amp. Before using relay with the pump control, please check the specifications of that particular relay to ensure that the current value through the coil will not exceed 1 amp.

  • Page 67: Adjusting Manifold Gas Pressure

    CONFIDENTIAL 710 / 710 ASME Service Manual Ver. 1.00 12-15. Adjusting manifold gas pressure The manifold gas pressure on the 710 can be adjusted by following the procedures below. Adjusting the manifold pressure can cause unexpected combustion conditions during operation, which can cause a health hazard, damage the 710, and/or shorten its lifespan.
  • Page 68 CONFIDENTIAL 710 / 710 ASME Service Manual Ver. 1.00 desired value. 6. After gas pressure has been set, deactivate the 710, remove the manometer tube, and replace the port screw. Figure 1 Manifold port Figure 2 Figure 3 Tube MAX button...

  • Page 69: Manually Adjusting The Fan Motor Speed

    CONFIDENTIAL 710 / 710 ASME Service Manual Ver. 1.00 12-16. Manually adjusting the fan motor speed While the FM+ dipswitch will automatically increase the fan speed by 7.5%, the fan motor speed on the 710 can also be manually adjusted. In order to perform manual adjustments to the speed, a remote controller is required.

  • Page 70: Freeze Protection System

    CONFIDENTIAL 710 / 710 ASME Service Manual Ver. 1.00 12-17. Freeze protection system There are two features to the 710 models freeze protection system: the automatic fan motor system and the ceramic heating blocks. The automatic fan motor system allows the 710 to briefly do fan motor operation and the ceramic heating blocks will heat up whatever portion of the heat exchanger the blocks are strapped to.
  • Page 71 CONFIDENTIAL 710 / 710 ASME Service Manual Ver. 1.00 <Deactivate condition> When the computer checks for these temperatures during the fan motor operation as freeze protection, the Automatic fan motor system will deactivate if: > T + 3.6°F > 50°F and T >...

  • Page 72: Freeze Protection For Recirculation Systems

    CONFIDENTIAL 710 / 710 ASME Service Manual Ver. 1.00 12-18. Freeze protection for recirculation systems <Function and Purpose> The 710 has the freeze protection function for a re-circulation system by using a pump installed in the system. Basically, this function is only ON / OFF control of the pump from the computer in the 710. When the computer detects the potential of the system freezing, the pump in the system starts automatically.
  • Page 73 CONFIDENTIAL 710 / 710 ASME Service Manual Ver. 1.00 <Freeze Protection pump setting mode> To set the Freeze protection pump mode in 710, please follow the procedures below: 1. While in Standby mode (cannot be in combustion, forced-combustion, or FM adjustment modes), press and hold the “Increase”...

  • Page 74: Draining The Unit And Cleaning The Inlet Water Filter

    CONFIDENTIAL 710 / 710 ASME Service Manual Ver. 1.00 12-19. Draining the unit and cleaning the inlet water filter 1. Close the manual gas shut off valve. 2. Turn off power to the 710, wait a few seconds. And then turn on again.

  • Page 75: Components Diagrams

    CONFIDENTIAL 710 / 710 ASME Service Manual Ver. 1.00 13. Components diagrams Case assembly 0 52 7 0 2 0 51 0 51 00 4 0 52 0 0 3 0 5 0 0 0 5 0 0 1 0 10...

  • Page 76: Burner Assembly

    CONFIDENTIAL 710 / 710 ASME Service Manual Ver. 1.00 Burner assembly The 710 and the 710 ASME share the same components. 1 0 3 1 0 2 1 0 1 40 1 1 1 3 1 5 2 1 5 3...
  • Page 77 710 / 710 ASME Service Manual Ver. 1.00 Other than Part# 211, Part#439, Part#440 and Part# 441, the 710 and Water way assembly the 710 ASME share the same components. 4 0 1 4 1 4 4 2 0 4 2 3...

  • Page 78: Parts List

    CONFIDENTIAL 710 / 710 ASME Service Manual Ver. 1.00 14. Parts list Item # Part # Description Common parts for other models 319143-287 Case assembly 319143-303 Front cover 319143-285 Air blockage plate 319143-225 Bracket 319143-283 Back guard panel 319143-014 Junction box...

  • Page 79: Manifold Assembly With Gas Valve Assembly

    CONFIDENTIAL 710 / 710 ASME Service Manual Ver. 1.00 Item # Part # Description Common parts for other models 319143-043 Fan motor 520, 310, 510, 910 319143-282 Fan damper 319143-185 Freeze protection thermostat 110, 310, 510 319143-304 Manifold gasket A...
  • Page 80 CONFIDENTIAL 710 / 710 ASME Service Manual Ver. 1.00 Item # Part # Description Common parts for other models 319143-088 Heater fixing plate 520, 110, 310, 510, 910 319143-070 Filter plug 520, 910 319143-071 O-ring P25 EPDM (Purple) 520, 910...

  • Page 81: Computer Board

    CONFIDENTIAL 710 / 710 ASME Service Manual Ver. 1.00 Item # Part # Description Common parts for other models 319143-098 Water outlet 319143-099 O-ring JASO# 1017 EPDM (Purple) 319143-349 O-ring P18 EPDM (Purple) 319143-316 Hot pipe for 710 ASME 319143-315...

  • Page 82: Revisions

    CONFIDENTIAL 710 / 710 ASME Service Manual Ver. 1.00 15. Records of revision of this manual Version Changes Date 1.00 First edition 11/19/10...

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