Lochinvar Shield SNA285-125 Installation & Service Manual Download Page 9 | Manualshive

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1/4” MIINIMUM CLEARANCE

AROUND HOT WATER PIPING

1” MINIMUM CLEARANCE

AROUND VENT PIPE

OPEN

FRONT

Figure 1-2 Alcove Installation - Minimum Required Clearances

6"

6"

1/4” (6.35 MM)

MINIMUM CLEARANCE

AROUND HOT WATER PIPES

1” (25.4 MM)

MINIMUM CLEARANCE

AROUND VENT PIPE

VENTILATING

AIR OPENING

CLOSED DOOR

VENTILATING

AIR OPENING

AREA OF EACH OPENING:

1 SQ. INCH PER 1000 BTU PER HOUR INPUT

WITH ALUMINUM OF 100 SQ. INCHES

Figure 1-1 Closet Installation - Minimum Required Clearances



WARNING

9

1

Determine water heater location

(continued)

RECOMMENDED SERVICE
CLEARANCES:

Top

-

18" (457 mm)

Left/Right Side - 24" (610 mm)
Front -

24" (610 mm)

RECOMMENDED SERVICE
CLEARANCES:

Top

-

18" (457 mm)

Left/Right Side - 24" (610 mm)
Front -

24" (610 mm)

Installation & Service Manual

TM



WARNING

For closet installations, CPVC,
polypropylene or stainless steel
vent material MUST BE used in
a closet structure due to elevated
temperatures. Failure to follow
this warning could result in fire,
personal injury, or death.

For alcove installations, CPVC,
polypropylene or stainless steel
vent material MUST BE used
in an alcove structure due to
elevated temperatures. Failure to
follow this warning could result
in fire, personal injury, or death.

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Summary of Contents for Shield SNA285-125

Page 1: ...her flammable vapors and liquids in the vicinity of this or any other appliance WHAT TO DO IF YOU SMELL GAS Do not try to light any appliance Do not touch any electrical switch do not use any phone in your building Immediately call your gas supplier from a near by phone Follow the gas supplier s instructions If you cannot reach your gas supplier call the fire department Installation and service mu...

Page 2: ...tion 43 Runtime Contacts 43 Alarm Contacts 43 8 CONDENSATE DISPOSAL Condensate Drain 46 9 START UP Check for Gas Leaks 47 Inspect fill Condensate System 47 Final Checks Before Starting the Water Heater 47 50 10 OPERATING INFORMATION How the Water Heater Operates 51 Temperature Control 51 Protection Features 51 Water Heater Temperature Regulation 52 Adjustable Control Parameters 52 Saving Parameter...

Page 3: ...ing property damage personal injury or death Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance WHAT TO DO IF YOU SMELL GAS Do not try to light any appliance Do not touch any electrical switch do not use any phone in your building Immediately call your gas supplier from a near by phone Follow the gas supplier s instructions If you cann...

Page 4: ... inlet temperature sensor This sensor monitors the inlet water temperature to the heat exchanger 19 Heat exchanger outlet temperature sensor This sensor monitors heat exchanger outlet water temperature 20 High limit sensor Device that monitors the outlet water temperature If the temperature exceeds its setting it will break the control circuit shutting the water heater down 21 Ignition electrode P...

Page 5: ...de inside unit Models SNR150 100 SNA285 125 29 17 5 16 33 26 9 25 13 8 2 23 14 30 27 3 22 Right Side inside unit Models SNR150 100 SNA285 125 The Shield How it works continued 32 2 35 36 7 13 34 28 24 31 Rear View Models SNR150 100 SNA285 125 5 Models SNR150 100 SNA285 125 Installation Service Manual TM ...

Page 6: ... 125 2 15 35 32 36 34 7 25 24 28 37 Rear View Model SNA500 125 Right Side inside unit Model SNA500 125 Right Side inside unit Model SNA400 125 Model SNA400 125 Model SNA500 125 9 26 35 22 8 23 15 16 33 17 29 5 30 9 26 27 25 8 23 15 16 17 29 5 3 Installation Service Manual TM ...

Page 7: ... manufactured with a different control module for altitude operation but the operation given in this manual remains the same as the standard models A high altitude label as shown in FIG A is also affixed to the unit 7 Maximum allowed working pressure is located on the rating plate Model Number Note Change N to L for L P gas models CSA Input Modulation Btu hr Note 2 Water Content Gallons Water Conn...

Page 8: ... not provide the minimum clearances shown it may not be possible to service the water heater without removing it from the space Closet and alcove installations This appliance requires a special venting system The vent connection to the appliance must be made with the CPVC pipe section installed in the appliance The field provided vent fittings must be cemented to the CPVC pipe section Use only the...

Page 9: ...ine water heater location continued RECOMMENDED SERVICE CLEARANCES Top 18 457 mm Left Right Side 24 610 mm Front 24 610 mm RECOMMENDED SERVICE CLEARANCES Top 18 457 mm Left Right Side 24 610 mm Front 24 610 mm Installation Service Manual TM WARNING For closet installations CPVC polypropylene or stainless steel vent material MUST BE used in a closet structure due to elevated temperatures Failure to...

Page 10: ... laundry facilities These areas will always contain contaminants WARNING WARNING 1 Determine water heater location Remove water heater from wood pallet 1 Remove the sides and the top of the crate 2 Remove the blocks on the base of the crate to allow for easier removal 3 The water heater can then be slid off the base of the crate for installation Do not drop the water heater or bump the jacket on t...

Page 11: ...rtion of the common venting system the common venting system should be resized to approach the minimum size as determined using the appropriate tables in Part 11 of the National Fuel Gas Code ANSI Z223 1 NFPA and or CAN CSA B149 1 Natural Gas and Propane Installation Code DANGER WARNING 1 Determine water heater location continued 11 Installation Service Manual TM Failure to follow all instructions...

Page 12: ...nstallation Multiple appliances may be installed side by side with no clearance between adjacent appliances because this appliance is approved for zero clearance from combustible surfaces Consult the Venting section of this manual for specific installation instructions for the appropriate type of venting system that you will be using Figure 1 3_Combustion Air Direct from Outside 1 If air is taken ...

Page 13: ...75 484 cm2 150 968 cm2 150 968 cm2 50 323 cm2 SNR200 100 50 323 cm2 50 323 cm2 100 646 cm2 100 646 cm2 200 1 291 cm2 200 1 291 cm2 67 433 cm2 SNA285 125 72 465 cm2 72 465 cm2 143 923 cm2 143 923 cm2 285 1 839 cm2 285 1 839 cm2 95 613 cm2 SNA400 125 100 646 cm2 100 646 cm2 200 1 291 cm2 200 1 291 cm2 400 2 581 cm2 400 2 581 cm2 134 865 cm2 SNA500 125 125 807 cm2 125 807 cm2 250 1 613 cm2 250 1 613 ...

Page 14: ...stion air opening a minimum of approximately 25 Check with louver manufacturers for exact net free area of louvers Where two openings are provided one must be within 12 30cm of the ceiling and one must be within 12 30cm of the floor of the equipment room Each opening must have net free area as specified in the chart above Table 1B Single openings shall commence within 12 30cm of the ceiling CAUTIO...

Page 15: ...ce Manual TM Figure 2 2 PVC CPVC Concentric Sidewall Termination See page 27 for more details Figure 2 3 Two Pipe Vertical Termination See page 30 for more details Figure 2 4 PVC CPVC Concentric Vertical Termination See page 32 for more details Figure 2 5 Vertical Vent Sidewall Air See page 19 for more details Direct venting options Vertical Vent ...

Page 16: ...ombustion air piping must be supported per guidelines listed in the National Mechanical Code Section 305 Table 305 4 or as local codes dictate 2 Vent Connector FIG s 2 7 thru 2 9 Used to provide a passageway for conveying combustion gases to the outside A transition fitting is provided on the unit for final connection Vent piping must be supported per the National Building Code Section 305 Table 3...

Page 17: ...owable combustion air and vent piping lengths are as follows Combustion Air 12 equivalent feet minimum 100 equivalent feet maximum Vent 12 equivalent feet minimum 100 equivalent feet maximum When determining equivalent combustion air and vent length add 5 feet for each 90 elbow and 3 feet for each 45 elbow EXAMPLE 20 feet of PVC pipe 4 90 elbows 2 45 elbows 1 concentric vent kit CVK3003 49 equival...

Page 18: ... Listed silicone sealant such as those manufactured by Dow Corning or General Electric b Do not install seams of vent pipe on the bottom of horizontal runs c Secure all joints with a minimum of three 3 sheet metal screws or pop rivets Apply Aluminum Foil Duct Tape or silicone sealant to all screws or rivets installed in the vent pipe d Ensure that the air inlet pipes are properly supported The PVC...

Page 19: ...n utilizing the single pipe method provisions for combustion and ventilation air must be in accordance with Air for Combustion and Ventilation of the latest edition of the National Fuel Gas Code ANSI Z223 1 in Canada the latest edition of CGA Standard B149 Installation Code for Gas Burning Appliances and Equipment or applicable provisions of the local building codes Commercial applications utilizi...

Page 20: ...scementfromthejointremovingringor beads as it will needlessly soften the pipe PVC CPVC Table 2D PVC CPVC Vent Pipe and Fittings All PVC vent pipes must be glued properly supported and the exhaust must be pitched a minimum of a 1 4 inch per foot back to the water heater to allow drainage of condensate NOTICE WARNING The vent connection to the appliance must be made with the starter CPVC pipe sectio...

Page 21: ...options in this manual and be a single wall vent offering For use of flex pipe it is recommended to have the vent material in 32 F or higher ambient space before bending at installation No bends should be made to greater than 45 and ONLY installed in vertical or near vertical installations For support and special connections required see the manufacturer s instructions All vent is to conform to st...

Page 22: ...use with stainless steel using the manufacturers listed in Table 2G Use only the materials vent systems and terminations listed in Tables 2G and 2H DO NOT mix vent systems of different types or manufacturers Failure to comply could result in severe personal injury death or substantial property damage WARNING Installations must comply with applicable national state and local codes Stainless steel v...

Page 23: ...S Figure 3 1A PVC CPVC Polypropylene Sidewall Termination of Air and Vent Follow instructions below when determining vent location to avoid possibility of severe personal injury death or substantial property damage A gas vent extending through an exterior wall shall not terminate adjacent to a wall or below building extensions such as eaves parapets balconies or decks Failure to comply could resul...

Page 24: ...low or horizontally from any door or window or any other gravity air inlet b Air inlet must terminate at least 12 inches above grade or snow line at least 12 inches below the vent termination and the vent pipe must not extend more than 24 inches vertically outside the building as shown in FIG 3 1B Condensate could freeze and block vent pipe c Do not terminate closer than 4 feet horizontally from a...

Page 25: ... intake piping through the wall into the vent plate openings Use RTV silicone sealant to seal the air pipe Use the cement primer listed in Table 2D on page 20 to seal the vent pipe 4 Mount and secure the vent plate to the wall using stainless steel screws 5 Seal all gaps between the pipes and wall Seal around the plate to the wall assuring no air gaps 6 Assemble the vent cap to the vent plate see ...

Page 26: ... inch hole for 3 inch vent pipe 5 inch hole for 4 inch vent pipe b Insert a galvanized metal thimble in the vent pipe hole as shown in FIG 3 4C 3 Use a sidewall termination plate as a template for correct location of hole centers 4 Follow all local codes for isolation of vent pipe when passing through floors or walls 5 Seal exterior openings thoroughly with exterior caulk All vent pipes and air in...

Page 27: ... 8 Kit Contents_CVK3007 SNA285 125 SNA500 125 Sidewall termination optional concentric vent Description and usage Lochinvar offers optional concentric combustion air and vent pipe termination kits Factory Kit CVK3003 for 3 diameter Models SNR150 100 SNR200 100 and CVK3007 for 4 diameter Models SNA285 125 SNA500 125 Both combustion air and vent pipes must attach to the termination kit The terminati...

Page 28: ... insulation or other materials to accumulate inside the pipe assembly when installing through the hole 7 Install the rain cap and small diameter pipe assembly into the Y concentric fitting and large pipe assembly Ensure small diameter pipe is bottomed and cemented in the Y concentric fitting for CVK3003 installations and fastened tightly into the rubber adapter for CVK3007 installations 8 Secure t...

Page 29: ...ion of flue gases Dimension A in FIG 3 13 represents the distance between pipes or rain shields as touching or a 2 inch maximum separation Figure 3 13 Concentric Vent and Combustion Air Termination Dimension A as Touching or 2 inches Maximum Separation Figure 3 12 Concentric Vent Sidewall Attachment DO NOT use field supplied couplings to extend pipes Airflow restriction will occur and may cause in...

Page 30: ... Venting Section on page 17 of this manual 2 Prepare the vent termination and the air termination elbow FIG 4 1A by inserting bird screens Bird screens should be obtained locally 3 The vent must terminate at least 3 feet above the highest place in which the vent penetrates the roof and at least 2 feet above any part of a building within 10 horizontal feet 4 The air piping must terminate in a down ...

Page 31: ... Provide flashing and sealing boots sized for the vent pipe and air pipe Multiple vent air terminations 1 When terminating multiple Shield water heaters terminate each vent air connection as described in this manual FIG 4 2 Terminate all vent pipes at the same height and all air pipes at the same height to avoid possibility of severe personal injury death or substantial property damage WARNING 2 P...

Page 32: ... a Cement the Y concentric fitting to the larger diameter kit pipe see FIG s 3 7 and 3 8 page 27 b Cement rain cap to the smaller diameter kit pipe see FIG s 3 7 and 3 8 page 27 c Do not attach a U Bent to the rain cap Doing so could cause recirculation see FIG 4 5 NOTICE WARNING 4 Vertical direct venting Installation Service Manual TM Vertical termination optional concentric vent Description and ...

Page 33: ...rect vent appliances are vented near each other each appliance must be individually vented see FIG 4 7 NEVER common vent or breach vent this appliance When two 2 or more direct vent appliances are vented near each other two 2 vent terminations may be installed as shown in FIG 4 7 The vent terminations must be at least 36 inches away from the first two 2 terminations It is important that vent termi...

Page 34: ...isted temperature and pressure relief valve will release the manufacturer from any claim which might result from excessive temperature and pressures Keep clear of the combination temperature and pressure relief valve discharge line outlet The discharge may be hot enough to cause scald injury The water is under pressure and may splash Hydrogen gas can be produced in an operating water heater that h...

Page 35: ...gallon will usually have a pH which can be aggressive and corrosive causing non warrantable damage to the pump and associated piping Corrosion due to water chemistry generally shows up first in the hot water system because heated water increases the rate of corrosive chemical reactions The following chart Table 5A details the relationship of water temperature and time with regard to scald injury a...

Page 36: ...YSTEM CIRCULATOR UNION TYPICAL BALL VALVE TYPICAL MIXING VALVE IF REQUIRED SEE PG 35 Figure 5 2 Single Unit Installation Service Manual TM Please note that these illustrations are meant to show system piping concept only the installer is responsible for all equipment and detailing required by local codes NOTICE ...

Page 37: ...RN SYSTEM CIRCULATOR UNION TYPICAL BALL VALVE TYPICAL MIXING VALVE IF REQUIRED SEE PG 35 Figure 5 3 Multiple Units Installation Service Manual TM Please note that these illustrations are meant to show system piping concept only the installer is responsible for all equipment and detailing required by local codes NOTICE ...

Page 38: ...ERATURE BUILDING RETURN UNION TYPICAL LOW TEMPERATURE BUILDING RETURN 180 HOT WATER SUPPLY MIXING VALVE Figure 5 4 Two Temperature Single Unit Installation Service Manual TM Please note that these illustrations are meant to show system piping concept only the installer is responsible for all equipment and detailing required by local codes NOTICE ...

Page 39: ...0 125 SNA500 125 5 Purge all air from the gas supply piping 6 Before placing the water heater in operation check the water heater and its gas connection for leaks a The appliance must be disconnected from the gas supply piping system during any pressure testing of that system at a test pressure in excess of 1 2 PSIG 3 5 kPa b The appliance must be isolated from the gas supply piping system by clos...

Page 40: ... requirements 1 Pressure required at the gas valve inlet pressure port Maximum 14 inches w c with no flow lockup or with water heater on Minimum 4 inches w c with gas flowing verify during water heater startup 2 Install 100 lockup gas pressure regulator in supply line if inlet pressure can exceed 14 inches w c at any time Adjust lockup regulator for 14 inches w c maximum Propane gas Pipe sizing fo...

Page 41: ...st the temperature set point on the control panel of the electronic control module to call for heat 7 Observe the gas supply pressure as the burner fires at 100 of rated input Percent of burner input will be displayed on the control panel 8 Ensure inlet pressure is within specified range Minimum and maximum gas supply pressures are specified in this section of the manual 9 If gas supply pressure i...

Page 42: ... Gas Supply Check Model SNA400 125 DETAIL LOOSEN THE SET SCREW ONE 1 FULL TURN AND PLACE THE MANOMETER TUBING OVER THE PRESSURE TAP Figure 6 6 Inlet Gas Supply Check Model SNA500 125 DO NOT adjust or attempt to measure gas valve outlet pressure The gas valve is factory set for the correct outlet pressure This setting is suitable for natural gas and propane when configured for LP requiring no field...

Page 43: ...bel all wires prior to disconnection when servicing controls Wiring errors can cause improper and dangerous operation WARNING NOTICE CAUTION LOW VOLTAGE WIRING KNOCKOUTS Figure 7 1 Routing Field Wiring Auxiliary device proving switch 1 When the operation of an external limit needs to be verified before the water heater fires remove the jumper wire from terminals X B and connect them to the contact...

Page 44: ...44 7 Field wiring Figure 7 3 Low Voltage Field Wiring Connections BUILDING MANAGMENT SYSTEM ALARM BELL LOW WATER CUTOFF Installation Service Manual TM ...

Page 45: ...EMPERATURE HIGH LIMIT SENSOR FLUE GAS SENSOR FLAME SENSOR LOW WATER CUTOFF BLOCKED DRAIN SWITCH DISPLAY PANEL CONTROL BOARD BLOCKED AIR INLET PRESSURE SWITCH LOW VOLTAGE CONNECTION BOARD CONTROL BOARD ALARM BELL ALARM CONTACTS RUNTIME CONTACTS WHR PUMP IGNITER BLOWER GAS VALVE DISPLAY PANEL INPUTS OUTPUTS Installation Service Manual TM ...

Page 46: ...C certified PVC or CPVC pipe fittings and cement 5 A condensate removal pump is required if the water heater is below the drain When installing a condensate pump select one approved for use with condensing water heaters and furnaces The pump should have an overflow switch to prevent property damage from condensate spillage The switch should be wired to the auxiliary device proving switch terminals...

Page 47: ...e switch located at the top of the trap FIG 9 1 3 Fill with fresh water until the water begins to pour out of the drain 4 Replace the cap Press the cap onto the trap until the cap makes contact with the drain 5 Replace the retaining screw WARNING The condensate trap FIG 9 1 must be filled with water during all times of water heater operation to avoid flue gas emission from the condensate drain lin...

Page 48: ...play until HTR Off appears in the display window 2 Remove the screws securing the top panel to the unit Remove the panel from the unit to gain access to the flue sensor 3 Locate the flue sensor in the top of the vent connection Remove the flue sensor and grommet from the unit Note Combustion measurements will be made at this point 4 Press the SHUTDOWN button on the display until HTR Standby appear...

Page 49: ...49 Figure 9 2 Operating Instructions Models SNR150 100 SNA285 125 9 Start up continued Installation Service Manual TM ...

Page 50: ...50 Figure 9 3 Operating Instructions Models SNA400 125 SNA500 125 9 Start up Installation Service Manual TM ...

Page 51: ...s 215 F the control will reduce the maximum fan speed If the flue temperature exceeds 240 F the control will shut the unit down The unit will restart automatically once the flue temperature drops 25 F and the minimum off time has expired The control monitors the temperature difference between the heat exchanger inlet and the heat exchanger outlet sensors If this difference exceeds 25 F the control...

Page 52: ... value is 6 3 F Temperature units F C The control can be configured to display temperature in either C or F This setting can be changed by the user or the installer The default is F Night setback temperature Once the internal clock has been set correctly the night setback feature can be used to program a lower tank set point The temperature range for this parameter is 32 F to 140 F The feature is ...

Page 53: ...g spark voltage to the spark electrode and opening the gas valve HTR IGNITION TANK 123 9F 129 5 If the control does not detect flame by the end of the trial for ignition the control performs the postpurge another prepurge and tries to light the burner again If the burner does not light after 4 trials the control locks out for 1 hour and then tries another set of 4 trials HTR POSTPURGE PREPURGE TAN...

Page 54: ...e Press to toggle between digits when entering the hour minutes etc or when entering date and time Figure 10 1 Control Panel Use the control panel FIG 10 1 to set temperatures operating conditions and monitor water heater operation 10 Operating information Installation Service Manual TM ...

Page 55: ...ar the combustion chamber and vent system of residual flue products Service The unit has been placed in a temporary mode that will allow the unit to fire at 100 of rate for the purpose of combustion analysis TANK F The tank temperature is displayed Open The control does not detect the tank sensor Shorted The tank sensor wires or the sensor itself has become shorted Press the Next arrow key on the ...

Page 56: ...e flue sensor wires or the sensor itself has become shorted Press the Next arrow key on the electronic control module display to access Screen 4 4 FAN SPD RPM The control will display the actual fan motor RPM FLAME SIG uA The control will display the flame signal in dc microamps Press the Next arrow key on the electronic control module display to access Screen 5 5 FAULT 01 MM DD YY fault FAULT 01 ...

Page 57: ... and connections Perform start up checkout and performance verification per Section 9 in this manual Flame inspection stable uniform Flame signal at least 10 microamps at high fire Clean the heat exchanger if flue temperature is more than 54 F above return water temperature Check anode rods Check Delta T Temperature Rise If combustion or performance indicate need Clean heat exchanger Remove and cl...

Page 58: ...mage 1 Inspect all water and gas piping and verify to be leak free 2 Look for signs of leaking lines and correct any problems found 3 Check gas line using the procedure found in Section 7 Gas Connections Check all piping for leaks The condensate trap must be filled with water during all times of water heater operation to avoid flue gas emission from the condensate drain line Failure to fill the tr...

Page 59: ... to avoid water damage Before operating lever check to see that a discharge line is connected to this valve directing the flow of hot water from the valve to a proper place of disposal Otherwise severe personal injury may result If no water flows valve is inoperative Shut down the water heater until a new relief valve has been installed 2 After following the warning directions if the relief valve ...

Page 60: ... humans Group 1 Normal operating temperatures in this appliance are below the level to convert ceramic fibers to cristobalite Abnormal operating conditions would have to be created to convert the ceramic fibers in this appliance to cristobalite The ceramic fiber material used in this appliance is an irritant when handling or replacing the ceramic materials it is advisable that the installer follow...

Page 61: ...g surfaces Do not use any solvent 7 Brush the heat exchanger while dry using a nylon bristle brush Caution DO NOT use a metal brush Re vacuum the heat exchanger 8 Finish cleaning using a clean cloth dampened with warm water Rinse out debris with a low pressure water supply 9 Allow the heat exchanger to thoroughly dry 10 Remove the field supplied rear refractory cover from the back of the combustio...

Page 62: ...uring water heater startup Check control module fuses ALWAYS check control module fuses before replacing control module or any major components blower etc If one of these fuses is blown it can prevent the control module or other components from operating 1 Turn OFF power to the water heater at the external disconnect switch 2 Remove top access cover 3 Remove the control module cover 4 Inspect fuse...

Page 63: ...oard Blown fuse Replace fuse F3 on the main control board see page 62 of this manual No Burner Operation Tank temperature set point satisfied Review temperature setting Unit locked out on fault Consult display for specific fault Refer to fault descriptions on page 66 of this manual for corrective actions Unit Does Not Modulate Above 50 Flue sensor open Verify that the flue sensor is located in the...

Page 64: ...ce 68 14 773 176 1 707 86 9 804 194 1 266 104 6 652 212 952 122 4 607 230 726 140 3 252 248 560 158 2 337 Checking temperature sensors The water heater temperature sensors inlet water outlet water tank water and flue are all resistance type devices The following tables show the correct values for the sensors at various temperatures Use an ohmmeter to read the resistance of the sensor at a known te...

Page 65: ...e maximum listed in the General Venting section Dirty damaged burner Refer to page 60 in this manual for the burner removal and inspection procedure Clean or replace the burner as necessary Low water flow through the heat exchanger Refer to Section 5 System Piping for minimum flow rates Air in the piping system Properly purge all air from the piping system No Pump Operation Blown fuse Replace fuse...

Page 66: ...between 4 14 inches w c and LP gas pressures should be between 8 14 inches w c Refer to Section 6 Gas Connections for detailed information concerning the gas supply Verify that the plastic hose from the gas valve to the air inlet is connected and is not damaged Verify that the vent air intake pipes are correctly installed and that there are no obstructions Check for 24 VAC to the gas valve at the ...

Page 67: ...that the plastic hose from the gas valve to the air inlet is connected and is not damaged Verify that the vent air intake pipes are installed correctly and there are no obstructions Check for 24 VAC to the gas valve at the 2 pin connection on the side of the main control board during the ignition attempt If no voltage is present replace the main control board If 24 VAC is present at the main contr...

Page 68: ...d Press the RESET button on the display to reset The actual fan RPM is 30 lower than what is being called for Vent air intake lengths exceed the maximum allowed lengths Refer to Section 2 General Venting for proper lengths Check for obstruction or blockage in the vent air intake pipes or at terminations Check the wiring connections at the fan and at the main control board Replace the fan Replace t...

Page 69: ...1 Outlet Sensor S2 Inlet Sensor Check the sensors and their associated wiring Repair or replace the sensor or wiring if damaged Measure the resistance of the sensors and compare the resistance to the tables on page 64 of this manual Replace the sensor if necessary External Limit Switch will retry after 5 minutes RESET may be pressed after condition is corrected An optional remote limit switch is n...

Page 70: ... The temperature rise across the heat exchanger has exceeded the set parameters for the water heater Verify that the system is full of water and that all air has been properly purged from the system Verify that the water heater is piped properly into the heating system Refer to Section 5 System Piping for the proper piping methods for the Shield water heater Check for 120 VAC to the water heater p...

Page 71: ...t all air has been properly purged from the system Verify that the water heater is piped properly into the heating system Refer to Section 5 System Piping for the proper piping methods for the Shield water heater Check 120 VAC to the water heater pump motor on a call for heat If voltage is not present check the wiring back to the main control board Replace the main control board if necessary If 12...

Page 72: ... is not within the specified range reference the chart below for possible causes and corrective actions Table 12F Troubleshooting Chart Combustion Levels POSSIBLE CAUSE CORRECTIVE ACTION Vent Air Intake Length or Obstruction Refer to Section 2 General Venting for the proper venting and air intake methods for the Shield water heater Check for obstructions at the vent air intake terminals Gas Supply...

Page 73: ...G 12 3 Using a screwdriver turn the screw 1 8 turn counterclockwise to increase CO2 levels or 1 8 turn clockwise to decrease CO2 levels After one adjustment on the valve follow the Combustion Analysis Procedure on page 72 of this manual to measure the combustion If combustion is still not within the specified range repeat the procedure This procedure SHOULD NOT be performed more than four 4 times ...

Page 74: ...OD INTEGRATED CONTROL GROUND JUNCTION BOX INTEGRATED CONTROL 120 VAC LOW VOLTAGE HIGH VOLTAGE CAUTION HIGH VOLTAGE SPARK LEAD BLOWER TERMINAL STRIP TERMINAL STRIP 2 1 X2 2 GND X6 2 CN2 12 NOTES 1 Where possible switches are shown without utilities gas water or electricity connected to the unit As such actual switch states may vary from those shown on diagrams depending upon whether utilities are c...

Page 75: ...HIGH VOLTAGE X3 PC INTERFACE CN2 6 Notes 1 All wiring must be installed in accordance with local state provincial and national code requirements per either N E C in USA or C S A in Canada 2 If any original equipment wire as supplied with the appliance must be replaced it must be replaced with wire having same wire gauge AWG and rated for a minimum of 105 C Exceptions Repl acement high voltage spar...

Page 76: ...cleaning procedure to reflect the new HEX cleaning kit R02634 Revision H ECO C06485 reflects the addition of required amperage rating 15 amp to the Power Cord Connection section on page 43 as well as the update of the piping diagrams on pages 36 38 and the addition of Figure 12 3 on page 61 with a new notice about rope gasket on heat exchanger door Clearances from hot water pipe have also been upd...

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