American Water Heater AHCG-100T150 Service Handbook Download Page 12 | Manualshive

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High-Efficiency Commercial Gas Series - Service Manual

Technical Literature Department

11

Ashland City, Tennessee © 2008

Servicing should only be performed by a Qualified Service Agent

VENTING – ALL MODELS – TWO PIPE DIRECT VENT – USING OUTSIDE AIR

MINIMUM 18 INCHES (46 CM)

MINIMUM 18 INCHES (46 CM)

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Summary of Contents for AHCG-100T150

Page 1: ...0508 198153 000 COMMERCIAL GAS WATER HEATERS FOR MODELS HCG 60T120 AHCG 60T120 HCG 100T150 AHCG 100T150 HCG 100T199 AHCG 100T199 HCG 100T250 AHCG 100T250 SERVICE HANDBOOK HIGH EFFICIENCY COMMERCIAL G...

Page 2: ...G ALL MODELS TWO PIPE DIRECT VENT USING OUTSIDE AIR 11 VENT INTAKE AIR TERMINATIONS 12 DIRECT VENT INSTALLATIONS 13 CONTROL OVERVIEW 14 ADJUSTING TANK TEMPERATURE OPERATING SET POINT DIFFERENTIAL 15 C...

Page 3: ...tification If you do not possess these skills or do not have the proper tools you should not attempt to service this water heater The service manual is designed to aid in servicing and troubleshooting...

Page 4: ...DL289 or equivalent DIGITAL MANOMETER 60 W C in 01 increments Note A digital manometer is required for testing pressure switches and can replace a gas pressure gauge draft gauge or slack tube manomete...

Page 5: ...icensed professionals for the installation of hard wired carbon monoxide detectors In the event that the side wall horizontally vented gas fueled equipment is installed in a crawl space or an attic th...

Page 6: ...her gas consuming appliances are not operating during this interval Btuh 3600 X H T T Time in seconds to burn 1 cubic foot of gas With a stopwatch read the gas meter and measure the amount of time req...

Page 7: ...gulator in the illustration Inlet gas pressure may be read at the inlet pressure tap only if the manual switch is set the ON position The gas control valve on the 120 KBtu hr model has a built in adju...

Page 8: ...Verify supply gas pressure is within the requirements given in the Instruction Manual that came with the water heater and shown in the table on page 4 prior to start up The inlet gas pressure must no...

Page 9: ...aken on the gas valve by connecting a manometer to the pressure ports on the valve The manifold pressure on this valve is 0 w c 0kPa when the water heater is running Refer to the gas pressure chart on...

Page 10: ...ree inch diameter 90 elbows are equivalent to 5 1 5m of pipe Maximum equivalent feet of intake and vent pipe using 4 PVC is 120 feet 36 6m Equivalent feet must include any 90 elbows two 45 elbows equa...

Page 11: ...ice Manual Technical Literature Department 10 Ashland City Tennessee 2008 Servicing should only be performed by a Qualified Service Agent VENTING ALL MODELS SINGLE PIPE POWER VENT USING ROOM AIR MINIM...

Page 12: ...ce Manual Technical Literature Department 11 Ashland City Tennessee 2008 Servicing should only be performed by a Qualified Service Agent VENTING ALL MODELS TWO PIPE DIRECT VENT USING OUTSIDE AIR MINIM...

Page 13: ...ES MUST BE FOLLOWED 1 The intake vent terminal and the exhaust vent terminal must terminate on the same exterior wall and must be located at a minimum of 24 61cm from the vertical centerline of the ex...

Page 14: ...WHEN THE WATER HEATER IS INSTALLED DIRECT VENT TWO PIPES THE BALANCE PLATE AND MESH SCREEN MUST BE REMOVED BEFORE GLUING PIPE TO THE CONNECTOR Terminations and mesh screens are provided Both terminati...

Page 15: ...ate of the water heater is also indicated graphically by status icons The table of status icons describes graphically operational details of the water heater Below is a legend of all the status icons...

Page 16: ...is menu allow you to monitor different temperature readings in the tank along with adjusting the Operating Set Point and Differential ACTION From the desktop screen press Menu DISPLAY ACTION From the...

Page 17: ...ature displays This can be found in the Display Settings menu Also in this menu you may adjust how the back light operates and the contrast of the LCD screen ACTION From the Main Menu press the DOWN b...

Page 18: ...afety related condition that the control has detected that may cause the water heater to operate in a less than optimal condition but does not pose a safety concern NOTE When these conditions occur co...

Page 19: ...m it will automatically be displayed on the UIM display and the back light will blink You can choose to leave the current fault or warning message by pressing the Back key You can return to the curren...

Page 20: ...ing will include diagnostic information as well as an estimate of how long ago the fault occurred ACTION Press the SELECT button for more information DISPLAY ACTION Press the DOWN key to scroll throug...

Page 21: ...period the gas valve will open allowing gas to enter the burner 7 The igniter will remain on for a short predetermined time period then will be turned off 8 The control will monitor the flame sensor t...

Page 22: ...pre purge cycle The control will store an error history to show what fault occurred and the time elapsed since the fault When the pre purge is complete power is applied to the igniter for Warm up At t...

Page 23: ...g two Phillips screws holding the cover The CCB is controlled by the settings given through the desk top menu UIM The CCB also monitors all pressure switches the hot surface igniter tank temperatures...

Page 24: ...control system will lock out and display a fault message on the UIM if this requirement is not met If the Blocked Exhaust fault message is displayed on the UIM ensure the condensate hose connected to...

Page 25: ...el 250 Natural 0 85 WC LP 0 85 WC Normally Closed Opens on a Fall in Pressure Tolerance 05 WC LOW GAS PRESSURE SWITCH MODEL PRESSURE Natural 4 0 WC LP 8 0 WC Normally Open Close on a Rise in Pressure...

Page 26: ...er and the flame sense rod are shown below Also shown is the burner sight glass These features are typical for all models The new High Efficiency commercial water heater is equipped with powered anode...

Page 27: ...and 70 ohms The minimum igniter current monitored by the CCB is 2 7 amps Once this threshold is met a check mark will appear by the igniter icon in the UIM display FLAME SENSOR This water heater is eq...

Page 28: ...Hz signal The blower rpm is controlled by the Central Control Board CCB The signal to the blower may be measured by attaching a MULTIMETER that has a Hertz Hz setting as shown in the illustration to...

Page 29: ...High Efficiency Commercial Gas Series Service Manual Technical Literature Department 28 Ashland City Tennessee 2008 Servicing should only be performed by a Qualified Service Agent WIRING DIAGRAM...

Page 30: ...2 PO Box 1597 500 Princeton Road Johnson City TN 37605 www americanwaterheater com...

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