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A.O. Smith 100 Series Service Handbook

Commercial gas fired boiler
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Service Handbook
COMMERCIAL GAS FIRED BOILER
FOR MODELS:
VW/VB 1500, VW/VB 2000
HOT WATER SUPPLY
HYDRONIC HEATING
500 Tennessee Waltz Parkway
Ashland City, TN 37015
SERIES 100, 101
INSTALLATION CONSIDERATIONS - PRE SERVICE
CHECKS - WATER HEATER CONSTRUCTION -
OPERATION & SERVICE - TROUBLESHOOTING
SERVICING SHOULD ONLY BE PERFORMED BY A QUALIFIED SERVICE AGENT
PRINTED IN THE U.S.A. 0910
318149-000

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  • Page 1 Service Handbook COMMERCIAL GAS FIRED BOILER FOR MODELS: VW/VB 1500, VW/VB 2000 HOT WATER SUPPLY HYDRONIC HEATING 500 Tennessee Waltz Parkway Ashland City, TN 37015 SERIES 100, 101 INSTALLATION CONSIDERATIONS - PRE SERVICE CHECKS - WATER HEATER CONSTRUCTION - OPERATION & SERVICE - TROUBLESHOOTING SERVICING SHOULD ONLY BE PERFORMED BY A QUALIFIED SERVICE AGENT PRINTED IN THE U.S.A.

  • Page 3: Table Of Contents

    TABLE OF CONTENTS TABLE OF CONTENTS ................1 Start Up Procedure ................35 INTRODUCTION ..................2 Manifold Gas Pressure Test............. 38 Model Numbers And Factory Configurations ........2 CONTROL SYSTEM OPERATION ............39 Qualifications ..................2 EMC 5000 Modulation Control ............39 Qualified Installer or Service Agency ..........

  • Page 4: Introduction

    INTRODUCTION This Service Manual covers VF Boiler models VW/VB 1500 and VW/VB 2000 - Series 100/101 Boilers. The instructions and illustrations contained in this Service Manual will provide you with troubleshooting procedures to diagnose and repair common service problems and verify proper operation. MODEL NUMBERS AND FACTORY CONFIGURATIONS See the rating plate affixed to the Boiler for Model, Series and Serial numbers.

  • Page 5: Service Reminder

    SERVICE REMINDER When performing any troubleshooting step outlined in this Service Manual, always consider the wiring and connectors between components. Perform a close visual inspection of all wiring and connectors to and from a given component before replacing components. Ensure wires were stripped before being crimped in a wire connector, ensure wires are crimped tightly in their connectors, ensure connection pins in sockets and plugs are not damaged or worn, ensure plugs and sockets are mating properly and providing good contact.

  • Page 6: Installation Considerations

    INSTALLATION CONSIDERATIONS This section of the Service Manual covers some of the critical installation requirements that, when overlooked, often result in operational problems, down time and needless parts replacement. Costs to correct installation errors are not covered under the limited warranty. Ensure all installation requirements and instructions contained in the Instruction Manual that came with the Boiler have been followed prior to performing any service procedures.

  • Page 7: Venting

    VENTING Ensure all venting requirements and venting installation instructions contained in the Instruction Manual that came with the Boiler have been observed and followed. Failing to install the required Boot Tee fitting at the Boiler's vent connection, not installing the factory provided vent and/or intake air terminations, exceeding the maximum equivalent vent and/or intake air piping lengths, adding too many elbows to the intake air and/or vent pipes, installing the wrong vent/intake air pipe size, will cause operational problems, improper combustion, rough starting/operation and Control System lock outs.

  • Page 8: Boiler Controls

    BOILER CONTROLS Boiler controls that are improperly installed or configured can cause serious operational and service related problems such as short cycling. This section provides information for how various controls can work together or independently to provide proper boiler and system control. THE HEATING CYCLE Two conditions must be met before the VF Boiler can start a heating cycle: 1.

  • Page 9: Remote Temperature Probe Installation

    reset schedules to maximize energy savings on hydronic heating applications during medium and low load conditions. The onsite BACnet compliant BMS must have its own temperature sensor installed in the storage tank for domestic water applications or in the return line on primary/secondary hydronic heating systems or it must monitor the factory supplied Remote Temperature Probe or Quad Thermistor Probe as described in the first method to initiate boiler heating cycles.

  • Page 10: Features And Components

    FEATURES AND COMPONENTS FRONT, BACK & SIDE VIEWS FRONT VIEW BACK VIEW VENTILATION 1 1/4 INCH NPT SUPPLY GAS AIR OPENINGS CONNECTION WITH FACTORY TOP FRONT PANEL INSTALLED SHUTOFF VALVE OPENS FOR SERVICE WITH SUPPLY GAS TEST PORT Out let 155°F Inlet 125°F...

  • Page 11: How It Works

    HOW IT WORKS VF Boiler Heat Exchangers are ASME constructed and rated at 160 PSI. All VF Boilers are SCAQMD Rule 1146.2 low NOx compliant and are equipped with CSD-1 compliant controls. The Heat Exchanger is a circular shaped vertical tube 4 pass Heat Exchanger constructed from 30 extruded copper tubes roll fitted into two ASME grade steel multiple pass headers that are glass lined.

  • Page 12: Operation And Service

    OPERATION AND SERVICE MODULATING FIRE OPERATION VF Boilers are modulating fire boilers, the Control Systems modulates the firing rate of the Burner between 25% and 100% to match system load by controlling the speed of the Combustion Bower, see Figure 4. VF Boilers do not have a gas orifice.

  • Page 13: Burner Assembly

    BURNER ASSEMBLY The Burner on the VF Boiler is a stainless steel radial fire burner with a woven steel fiber surface. It is installed in the center of the vertical tube Heat Exchanger, see Figure 3 on page 9. The Burner is mounted inside the recess of the top header on the Heat Exchanger.

  • Page 14: Venturi & Gas Train

    VENTURI & GAS TRAIN The gas train includes a Venturi connected to the inlet of the Combustion Blower. The outlet of the 120 Volt Gas Valve is also connected to the Venturi by a manifold gas line. There is a shutoff valve installed in the manifold gas line for start up and service procedures.

  • Page 15: Config Key

    CONFIG KEY The Config Key is an 18” long cable with a plug on one end and an EEPROM memory chip sealed at the other. The Config Key plugs into the J23 socket on the MCB, see MCB - Section H on page 27. The memory chip contains blower speed programming data specific to the input Btu/hr and fuel type for each VF Boiler.

  • Page 16: Combustion Blower Speed Data

    COMBUSTION BLOWER SPEED DATA Nominal Combustion Blower speeds during various operating states for natural gas models are shown in Table 1 below. Combustion Blower speeds for propane models are shown in Table 2. Due to slip in the Combustion Blower and manufacturing tolerances in the electronic speed control these numbers will vary. When combustion is poor, the firing rate of the Boiler or the Combustion Blower speed is in question, or the Boiler is experiencing rough starting/operation or ignition failure compare the values given here to actual blower speeds shown in the Control States menu.

  • Page 17: Temperature Probes

    TEMPERATURE PROBES Temperature probes are 3/4 inch male NPT threaded immersion probes, see Figure 8. Temperature probes have embedded temperature sensors (thermistors). Thermistors are thermally sensitive resistors; as the surrounding temperature rises the resistance of the thermistor (measured in ohms) will decrease and as the surrounding temperature falls the resistance of the thermistor increases, see Table 3 on page 16.
  • Page 18 QUAD THERMISTOR PROBE EIGHT WIRE TERMINAL STRIP FOR CONNECTIONS MOUNTED INSIDE THE PROBE COVER FOUR (2 WIRE - COLOR CODED) TEMPERATURE SENSOR CIRCUITS FOR USE WITH MULTIPLE BOILERS. SIDE VIEW FACTORY EQUIPPED WITH 6 x 1/2 INCH NPT PIPE NIPPLE TO ACCOMMODATE STORAGE TANK INSULATION THICKNESS.

  • Page 19: Control Panel

    CONTROL PANEL Figure 10 shows the Control Panel layout inside the VF Boiler. Three pressure switches are located in the upper right corner. Directly beneath the pressure switches is the Pump Relay that energizes factory installed Boiler Circulation Pumps or field supplied 120 VAC pumps up to 1 horsepower. For higher voltage/ horsepower pumps a field supplied starter must be used.

  • Page 20: Pressure Switches

    PRESSURE SWITCHES There are three pressure switches installed on all VF Boilers to verify the venting (exhaust) and the intake air are not restricted and to confirm the Combustion Blower is operating properly when energized, see Figure 10 on page 17 and Figure 11 below. The sensing tubes must be routed to the correct sensing ports and they must be properly connected at all times.

  • Page 21: Mcb - Modulation Control Board

    MCB - MODULATION CONTROL BOARD The MCB circuit board is the main controller and is located on the Control Panel, see Figure 10 on page 17. All instructions for Burner modulation and temperature control originate from this circuit board. Diagnostic and operational messages are generated by the MCB and sent to the UIM.
  • Page 22 MCB - SECTION A See Figure 12 on page 19 for location of this section on the MCB. RED LED F1 FUSE 1 2 3 Figure 13 The upper right corner of the MCB contains the following sockets/components: • Red LED (illuminated when the F1 fuse is open or not installed) •...
  • Page 23 MCB - SECTION B See Figure 12 on page 19 for location of this section on the MCB. 5 4 3 10 9 8 7 6 10 9 8 7 6 5 4 3 2 1 Figure 14 • J5 Socket (Inputs) •...
  • Page 24 MCB - SECTION C See Figure 12 on page 19 for location of this section on the MCB. 1 2 3 4 1 2 3 4 Figure 15 • J2 Socket (Boiler Circulation Pump relay coil - see Figure 10 on page 17 for location) •...
  • Page 25 MCB - SECTION D See Figure 12 on page 19 for location of this section on the MCB. 1 2 3 4 5 6 7 8 9 10 O P E N Figure 16 System configurations are set on the MCB circuit board with dip switches. SW1 dipswitch settings can be viewed physically on the MCB.
  • Page 26 MCB - SECTION E See Figure 12 on page 19 for location of this section on the MCB. 3 2 1 6 5 4 Figure 17 • J8 Socket (Inlet Temperature Probe) • J6 Socket (Not Used) • Pin 1 - Not used •...
  • Page 27 MCB - SECTION F See Figure 12 on page 19 for location of this section on the MCB. ICSP COMM COMM COMM COMM Figure 18 ICSP Port The ICSP port (In Circuit Serial Programming) is used for programming the MCB. DO NOT plug any device or cable into this port.
  • Page 28 MCB - SECTION G See Figure 12 on page 19 for location of this section on the MCB. Figure 19 Along the left edge of the MCB there is a second dip switch array; SW2. There are three SW2 dipswitches. Switch 1 and 3 are not used.
  • Page 29 MCB - SECTION H See Figure 12 on page 19 for location of this section on the MCB. 4 3 2 1 8 7 6 5 Figure 20 This section of the MCB contains the J23 and J24 sockets. The J23 Socket is used to connect the Config Key, see Config Key on page 13.

  • Page 30: Pdb - Power Distribution Board

    PDB - POWER DISTRIBUTION BOARD The PDB provides connection points for line-input (120 VAC) power, the Boiler Circulation Pump, the Combustion Blower and the Transformer. The PDB also distributes the Transformer output (24 VAC) power to necessary locations. It also contains fuses for various Boiler components. The PDB is located on the Control Panel, see Figure 10 on page 17.
  • Page 31 PDB - SECTION A See Figure 21 on page 28 for location of this section on the PDB. TB1 Terminal Strip F2 Fuse 20 Amp Boiler Circulation Pump Integral Jumpers N.0. From On/Off Power Relay - 120 VAC Hot Power Relay Contacts From Junction Box - Power Supply 120 VAC Neutral From Junction Box - Power Supply Ground Wire Figure 22...
  • Page 32 PDB - SECTION B See Figure 21 on page 28 for location of this section on the PDB. Figure 23 The mid section of the PDB contains the fusing for the following: • F1 Fuse - 10 amp 240 VAC - European Models only •...
  • Page 33 PDB - SECTION C See Figure 21 on page 28 for location of this section on the PDB. Transformer 24 VAC Output Figure 24 The upper left corner of the PDB contains the following: • J1 Socket (Transformer 120 VAC x 24 VAC - 100VA) •...
  • Page 34 PDB - SECTION D See Figure 21 on page 28 for location of this section on the PDB. 115 VAC Output Figure 25 The upper right corner of the PDB contains the J3 Socket and the JP1 jumper. The J3 Socket is described here.

  • Page 35: Power Supply Test

    POWER SUPPLY TEST See Figure 21 on page 28 for location of the JP1 jumper and the power supply status LED lights on the PDB circuit board shown below. This illustration is rotated 90° clockwise. Yellow Green Test Figure 26 The upper right corner of the PDB contains three JP1 jumper pins, a two pin jumper and three power supply status LED lights.

  • Page 36: Start Up

    START UP PRIOR TO START UP In addition to normal supplies and hand tools necessary for installing and servicing water heaters and boilers the following tools and test equipment should be on hand. See Tools Required on page 3 for detailed tool requirements.

  • Page 37: Start Up Procedure

    START UP PROCEDURE 1. Before starting the Boiler, read the Instruction Manual supplied with the Boiler. Ensure the water piping, supply gas line, boiler controls, and venting have all been installed per the Instruction Manual requirements. Do not perform a Start Up unless all installation requirements and instructions contained in the Instruction Manual that came with the Boiler have been followed and observed.
  • Page 38 15. Energize the branch circuit supplying power to the Boiler and turn the Boiler's on/off switch to the on position. Ensure the Operating Setpoint is set high enough to activate a heating cycle, see Operating Setpoint Adjustment on page 43. If an external control is using the Boiler’s Enable/Disable circuit ensure the external that control's contacts are closed, see Boiler Controls on page 6.
  • Page 39 23. Set the Modulate Mode to the Min Mode firing mode again and recheck CO2 readings, fine tune the gas flow as necessary. 24. When gas flow adjustments are complete remove all test instruments and replace all plugs and caps. Water Flow Setup 25.

  • Page 40: Manifold Gas Pressure Test

    MANIFOLD GAS PRESSURE TEST Using a plastic Tee fitting and flexible tubing (see Tools Required on page 3) install the Tee fitting in-line with the Boiler's pressure switch sensing tube connected to the Manifold Pressure Sensing Port on the Manifold Gas Train.

  • Page 41: Control System Operation

    CONTROL SYSTEM OPERATION EMC 5000 MODULATION CONTROL VF Boilers are equipped with the EMC 5000 Modulating Control System. EMC 5000 is an electronic boiler Control System developed by A. O. Smith. EMC stands for Energy Management Control. The Control System modulates the Boiler's firing rate between 25% and 100%;...

  • Page 42: Control System Navigation

    CONTROL SYSTEM NAVIGATION UIM - USER INTERFACE MODULE The UIM is an assembly that consists of several electronic components. The circuit board in the assembly is the UIB (User Interface Board) which includes a communications port. The UIB relays user input and data to and from the MCB (Modulation Control Board).

  • Page 43: Status Lights

    STATUS LIGHTS System Status > O p e r Set pnt 1 05 ° F LEDs S e tp nt D iff 5 ° F H i L i mit 2 35 ° F H i L i mit D if 30 °...

  • Page 44: User Input Buttons

    USER INPUT BUTTONS “>” symbol flashes when Arrows appear on the LCD when there adjustment mode is is more information above or below the active for a setting current 4 lines displayed. Use the Up and Down buttons to navigate. >...

  • Page 45: Adjusting User Settings

    ADJUSTING USER SETTINGS OPERATING SETPOINT ADJUSTMENT The Operating Setpoint is the most commonly adjusted user setting and represents the temperature the Control System will regulate water temperature at in a storage tank or hydronic heating loop. The Operating Setpoint is abbreviated "Oper Setpnt" in the User Settings Menu. Figure 32 and the instructions below show how to navigate to the User Settings Menu and change the Operating Setpoint.

  • Page 46: Control System Menus

    CONTROL SYSTEM MENUS At the top center of the UIM panel is the display LCD. This LCD is used to provide information to the user through various Control System Menus. There are 10 Control System Menus, see Table 10 below. Helpful context sensitive information can be displayed at any time by touching the “Help”...

  • Page 47: Sequence Of Operation

    SEQUENCE OF OPERATION Call For Heat is Activated EMC 5000 Control System compares the temperature read EMC 5000 Control System performs diagnostic Control System Locks Out Displays from the Controlling Probe (Inlet system check. The normal state of all pressure A Specific Error Message: Probe, Remote Temperature Probe switches and the Manual Reset High Limit are...

  • Page 48: Troubleshooting

    TROUBLESHOOTING POOR COMBUSTION - IGNITION FAILURE - ROUGH START/OPERATION If the high and/or low fire CO2 combustion readings are not in accordance with Table 7 and Table 8 on page 36, or the CO readings are high, or if the boiler is experiencing ignition failure or rough starting/operation perform the following procedures: VERIFY CORRECT CONFIG KEY IS INSTALLED 1.

  • Page 49: Restore Gas Flow Settings To Default

    RESTORE GAS FLOW SETTINGS TO DEFAULT Each VF Boiler is fired and the optimal combustion set before leaving the factory. The High and Low Fire gas flow adjustment screws on the 120 VAC Gas Valve have been set to maximize the boilers performance. When performing the on site Start-up, gas flow can be improperly adjusted to the point the boiler will not light.

  • Page 50: Error Messages

    ERROR MESSAGES The EMC 5000 Modulation Control System performs exhaustive self diagnostics and displays detected fault conditions on the UIM (page 40) as Error Messages. Troubleshooting procedures for the most common Error Messages are covered in this Service Manual. The first column in the Error Message Tables that follow will show the actual condition or Error Message as displayed on the UIM's LCD screen along with an explanation of the Error Message.

  • Page 51: Lcd Display Is Blank

    DISPLAYED MESSAGE/CONDITION/INDICATES CHECK/REPAIR LCD Display Is Blank • Ensure the Boiler's on/off switch is in the "on" position and is working properly and supplying 120 VAC to the The LCD on the UIM is not showing any data. on/off power relay coil - replace switch if defective. Possible causes for this include: •...

  • Page 52: Display Fail

    DISPLAYED MESSAGE/CONDITION/INDICATES CHECK/REPAIR Display Fail • Plug UIM Comm cable into the other Internal Comm port on the MCB, see page 25. Communication between the MCB and UIM has been • Check communication cable to the UIM. Turn off interrupted - the MCB is unable to communicate with the power and Install a new/different communication UIM.

  • Page 53: Config Key Part

    DISPLAYED MESSAGE/CONDITION/INDICATES CHECK/REPAIR Config Key Part • Turn power off to the Boiler for 1 minute and then turn power back on. Press the Select button on the UIM to The MCB has detected the Config Key is defective. clear any error messages. This will provide the MCB The Config Key contains model specific (Btu/hr &...

  • Page 54: Low Water

    DISPLAYED MESSAGE/CONDITION/INDICATES CHECK/REPAIR Low Water • Ensure there is water in the lines/boiler. • Remove and clean LWCO sensor. The LWCO sensor The Control System has detected that water is not being is located inside the upper compartment of the Boiler sensed by the optional LWCO (Low Water Cut Off) device threaded into the upper head of the Heat Exchanger.

  • Page 55: Low Gas

    DISPLAYED MESSAGE/CONDITION/INDICATES CHECK/REPAIR Low Gas • Check all wiring, plugs and sockets between the Low Gas Pressure Switch and the J5 Socket on the MCB. The Control System has detected the Low Gas Pressure Ensure all connectors, plugs and sockets are making Switch contacts are open.

  • Page 56: No Flow

    DISPLAYED MESSAGE/CONDITION/INDICATES CHECK/REPAIR No Flow Field Installed Boiler Circulation Pump Pump IS NOT Running (If the pump is running see "No Flow - Pump Is Running" on the • Check for power at the pump motor wiring/terminals. following page) If the pump is being supplied with the correct voltage (see field installed pump rating plate) but will not start The Control System has detected the normally open - replace/repair the pump.
  • Page 57 DISPLAYED MESSAGE/CONDITION/INDICATES CHECK/REPAIR No Flow New Boiler Installation In Existing Systems Pump IS Running (If the pump is not running see "No Flow - Pump Is Not Running" on • Check for restrictions inside the water lines the preceding page) (accumulated lime) to and from the boiler.

  • Page 58: Inlet Probe

    DISPLAYED MESSAGE/CONDITION/INDICATES CHECK/REPAIR Inlet Probe • Check the plug/socket connection at the MCB J8 Socket, see MCB - Section E on page 24. Ensure the The Control System has detected an open or shorted Inlet plug/socket pins are in good condition and making Temperature Probe when the Inlet Temperature Probe is good contact - repair/replace anything worn or configured as the Controlling Probe.

  • Page 59: Tank Probe

    DISPLAYED MESSAGE/CONDITION/INDICATES CHECK/REPAIR Tank Probe • Check the plug/socket connection at the MCB J9 Socket, see MCB - Section E on page 24. Ensure the The Control System has detected an open or shorted plug/socket pins are in good condition and making Remote (Tank/Loop) Temperature Probe circuit when the good contact - repair/replace anything worn or Remote Temperature Probe, or optional Quad Thermistor...

  • Page 60: Outlet Probe

    DISPLAYED MESSAGE/CONDITION/INDICATES CHECK/REPAIR Outlet Probe • Check the plug/socket connection at the MCB J7 Socket, see MCB - Section E on page 24. Ensure the The Control System has detected an open or shorted plug/socket pins are in good condition and making Outlet Temperature Probe circuit.

  • Page 61: Blower Prover

    DISPLAYED MESSAGE/CONDITION/INDICATES CHECK/REPAIR Blower Prover Turn the boiler off for the following tests: • Ensure there is not a jumper wire installed between Combustion Blower IS NOT Running the two wiring terminals on the BPS (Blower Prover (If the Combustion Blower is running see "Blower Prover - Combustion Switch), see Figure 11 on page 18.
  • Page 62 DISPLAYED MESSAGE/CONDITION/INDICATES CHECK/REPAIR Blower Prover • Ensure the sensing tubes connected to the BPS (Blower Prover Switch) and the BIS (Blocked Intake Combustion Blower IS Running Air Switch) are not kinked or disconnected, see (If the Combustion Blower is not running see "Blower Prover - Figure 11 on page 18.

  • Page 63: Blocked Inlet

    DISPLAYED MESSAGE/CONDITION/INDICATES CHECK/REPAIR Blocked Inlet Turn the boiler off for the following tests: • On Conventional Vent installations (using room air for The Control System has detected the Blocked Intake Air combustion) ensure the intake air connection on the Switch contacts are open during operation. boiler is not blocked or clogged with debris.

  • Page 64: Blocked Flue

    DISPLAYED MESSAGE/CONDITION/INDICATES CHECK/REPAIR Blocked Flue Turn the boiler off for the following tests: • Ensure there are no obstructions in the vent piping The Control System has detected the Blocked Flue Switch causing blockage. contacts are open during operation. • Ensure the vent pipe used is not smaller than Operational &...

  • Page 65: Flame

    DISPLAYED MESSAGE/CONDITION/INDICATES CHECK/REPAIR Flame • Ensure the supply gas shut off valve to the boiler and the Manifold Gas Shut Off Valve in the gas train The Control System has failed to verify flame sensing between the 120 VAC Gas Valve and the Venturi are current from one of the two Flame Sensors during the both fully open.
  • Page 66 DISPLAYED MESSAGE/CONDITION/INDICATES CHECK/REPAIR Flame (continued) • Check the supply gas pressure to the boiler. Follow the instructions in Start Up Procedure on page 35 The Control System has failed to verify flame sensing to measure and record the supply gas pressure, current from one of the two Flame Sensors during the see Figure 27 on page 37.

  • Page 67: Piping Diagrams

    PIPING DIAGRAMS TEMPERATURE PROBE AND BYPASS LINE LOCATION On domestic hot water applications the Remote Temperature Probe or the optional Quad Thermistor Probe must be installed in the designated temperature control opening on the storage tank, typically a 3/4 inch NPT opening in the lower portion of the tank.
  • Page 68 Servicing should only be performed by a Qualified Service Agent...
  • Page 69 Servicing should only be performed by a Qualified Service Agent...
  • Page 70 Servicing should only be performed by a Qualified Service Agent...

  • Page 71: Boiler Temperature Logs

    BOILER TEMPERATURE LOGS SCHEDULING DELIMING MAINTENANCE It is critically important to set the water temperature rise through the boiler according to the requirements given in the Instruction Manual that came with the boiler, see Start Up on page 34. Once the water temperature rise (Delta T - ΔT) through the boiler has been set mark the positions of the supply water (outlet) valve and the bypass valve.
  • Page 72 BOILER TEMPERATURE LOG† DATE/TIME OUTLET TEMP INLET TEMP‡ TEMP RISE ΔT READINGS TAKEN BY † [Outlet - Inlet = Delta T D] Outlet (supply water) temperature minus inlet (return water) temperature equals the temperature rise (Delta ΔT) through the boiler. Readings should be taken weekly. When the ΔT increases by 5°F schedule deliming maintenance to ensure optimal efficiency and prevent heavy lime accumulation i the boiler's heat exchanger.
  • Page 73 BOILER TEMPERATURE LOG† DATE/TIME OUTLET TEMP INLET TEMP‡ TEMP RISE ΔT READINGS TAKEN BY † [Outlet - Inlet = Delta T D] Outlet (supply water) temperature minus inlet (return water) temperature equals the temperature rise (Delta ΔT) through the boiler. Readings should be taken weekly. When the ΔT increases by 5°F schedule deliming maintenance to ensure optimal efficiency and prevent heavy lime accumulation i the boiler's heat exchanger.
  • Page 74 BOILER TEMPERATURE LOG† DATE/TIME OUTLET TEMP INLET TEMP‡ TEMP RISE ΔT READINGS TAKEN BY † [Outlet - Inlet = Delta T D] Outlet (supply water) temperature minus inlet (return water) temperature equals the temperature rise (Delta ΔT) through the boiler. Readings should be taken weekly. When the ΔT increases by 5°F schedule deliming maintenance to ensure optimal efficiency and prevent heavy lime accumulation i the boiler's heat exchanger.
  • Page 75 Servicing should only be performed by a Qualified Service Agent...
  • Page 76 500 Tennessee Waltz Parkway, Ashland City, TN 37015 Technical Support: 800-527-1953 • Parts: 800-433-2545 • Fax: 800-644-9306 www.hotwater.com...

This manual is also suitable for:

101 seriesVb 1500Vb 2000Vw 1500Vw 2000

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