As an ENERGY STAR® Partner, U.S. Boiler Company has determined that this boiler meets the ENERGY STAR® guidelines for energy efciency established
102. Screw the water supply manifold into the boiler outlet tapping “O.”3. Orient the manifold with the relief valve on top.4. Screw the relief val
117. Screw an installer-supplied 1¼” pipe or nipple into the water return tapping “R”.8. Screw the supplied drain valve into tapping “D”.6. CONNECT
12 DISCONNECT ELECTRICAL POWER to the boiler and heating system before servicing. Positively assure that no voltage is present. Lock ele
13Using Intelligent Hydronic Control Display8. PROGRAM THE CONTROLSViewing the Operating Mode OptionsIn operating mode the user may view (but not cha
14Unit DisplayORSample Display1 sec1 sec1 sec Please note that in operating mode to hold the display on the value the user can press and hold either t
15Circulator Pre-purge time has a factory setting of 2 minutes and is eld adjustable between 2 and 20 minutes. When reset card is installed, pre-pur
168. PROGRAM THE CONTROLS (continued)b. When dh_ is set equal to Second Heating Zone (tt2) When there is no IWH the “DHW Circulator” output may b
1710-b10. PERFORM STARTUP CHECKS AND ADJUSTMENTS FAILURE TO PERFORM THESE CHECKS of the boiler's combustion and safety systems may
18ANNUAL MAINTENANCE CHECKLIST WARNINGSTHE BOILER CONTAINS REFRACTORY CERAMIC FIBER, a possible human carcinogen Use a NIOSH approved respirator whe
19TROUBLESHOOTINGBefore troubleshooting The following pages contain trouble shooting tables for use in diagnosing control problems. When using thes
2FOLLOW ALL INSTRUCTIONS and warnings printed in this manual and posted on the boiler.INSPECT THE BOILER ANNUALLY. To keep your boiler safe and efcie
20TROUBLESHOOTING (continued)Use Control Display ERR (error) Number To Direct TroubleShooting Efforts If the control detects an error it will ash “E
21Use STA (status) Number To Guide TroubleShooting The control will ash “STA” followed by a number. Use this number to identify the boiler problem
22TROUBLESHOOTING (continued)6. Circulator is On, Damper is Open but Boiler Fails to Start Display / Status DescriptionSTA 10Retry / RecycleDelayThe
23TROUBLESHOOTING (continued)Display / StatusRecommended Corrective ActionStA 10Retry / Recycle DelayStA 13Soft Lockout1. No Spark a. Can you he
24TROUBLESHOOTING (continued)If Control Shows Status Code “STA 15": The control is “Waiting for Limit to Close” and the display on the IQ Optio
25Key No.Description[Quantity] Part Number ES23 ES24 ES25 ES26 ES27 ES28 ES291A Block Assembly 102287-03 102287-04 102287-05 102287-06 102287-07 10228
26REPAIR PARTS LIST (continued)Key No.Description[Quantity] Part Number ES23 ES24 ES25 ES26 ES27 ES28 ES292A Base Wrapper 71807031 71807041 71807051 7
27REPAIR PARTS LIST (continued)Key No.Description[Quantity] Part Number ES23 ES24 ES25 ES26 ES27 ES28 ES293AGas Valve (Natural Gas), Honeywell VR8204P
28REPAIR PARTS LIST (continued)Key No.Description[Quantity] Part Number ES23 ES24 ES25 ES26 ES27 ES28 ES294A Control 103660-014B IQ Option Panel 10229
29Key No.Description[Quantity] Part Number ES23 ES24 ES25 ES26 ES27 ES28 ES295A Jacket Left Side Panel 102566-015B Jacket Right Side Panel 102567-015C
3Congratulations on your purchase of a new ES2™ boiler—designed and constructed to provide you with years of reliable service. • ENERGY STAR™ effici
30REPAIR PARTS LIST (continued)Key No.Description[Quantity] Part Number ES23 ES24 ES25 ES26 ES27 ES28 ES296A Supply Water Manifold 806070016B Temperat
31INTERNAL WIRING Figure IW-1: Wiring Diagram
32INTERNAL WIRING (continued)Figure IW-2: Wiring Schematic
33Figure IW-3: Multiple Zone System with Zone CirculatorsINTERNAL WIRING (continued)Figure IW-4: Multiple Zone System with Zone Valves
34Figure IW-5: Multiple Zone System with Zone Circulator PanelINTERNAL WIRING (continued)T STAT 1VALVE 1T STAT 2VALVE 2T STAT 3OFFONZONE 4 PRIORITYTA
35APPENDIX A – COMBUSTION AIR PROVIDE ENOUGH AIR to ventilate the boiler room, dilute the ue gases, and sustain combustion. Ignition fail
36APPENDIX B – VENTING VENT THIS BOILER according to the instructions. Failure to do so may cause products of combustion to enter the buil
37 Au moment du retrait d’une chaudière existante, les mesures suivantes doivent être prises pour chaque appareil toujours raccordé au système d’eva
38APPENDIX B1 – ATMOSPHERIC VENTINGFigure B-1: Typical Atmospheric Vent Installation GENERAL WARNINGS FOR ATMOSPHERIC VENTING SYSTEMSUSE ATMOSPHERI
39N’ÉVACUEZ LES PRODUITS DE LA COMBUSTION DU GAZ DANS L’ATMOSPHÈRE que dans le cas de chaudières approuvées pour cela comme le stipule la section Spéc
4 ES2 SeriesBoiler ModelInput (MBH) DOE Heating Capacity (MBH) Net AHRI Rating (MBH) AFUE (%)ES23 70 59 51 85ES24 105
40APPENDIX C – GAS PIPING ASSURE GAS PIPING IS LEAK FREE AND OF PROPER SIZE and type for the connected load. SHUT OFF MAIN GAS SUPPLY
415. Bond all above-ground gas piping to a grounding electrode and ensure the piping is electrically continuous. DO NOT USE GAS PIPING AS A
423. Overpressure(1) Install a properly sized expansion tank. (2) Do not exceed the boiler’s specic requirements for maximum allowable working
43APPENDIX D – System Piping (continued)Figure D-W2: Recommended Water Piping for Zone Valve Zoned Heating Systems
44APPENDIX D – System Piping (continued)Figure D-W3: Recommended Water Piping for Circulator Zoned Heating Systems
45APPENDIX E – FILLING THE SYSTEM AND CHECKING FOR LEAKSFill entire heating system with water and vent air from system. Use the following procedure o
46APPENDIX F – ADJUSTING GAS INPUT RATECheck Manifold Pressure:1. Note the rated manifold gas pressure listed on the boiler’s rating label.2. Connec
47APPENDIX G – CHECKING DRAFT AND COMBUSTIONCHECK DRAFT (GAS BOILERS WITH DRAFT HOODS)1. Insofar as is practical, close all doors and windows in the
48APPENDIX H – OPERATIONBoiler Sequence of OperationNORMAL OPERATION1. The ES2 Boilers are equipped with an Intelligent Hydronic Control (control).
49APPENDIX I – IQ CONTROL SYSTEMIQ Control System Overview The “IQ Control System” consists of a control and an IQ Option Panel with optional “plug in
5Figure S-1: Minimum Clearances to Combustibles and Alcove DimensionsSPECIFICATIONS (continued)
50APPENDIX I – IQ Control System (continued)IQ Outdoor Reset Option Card Kit: P/N 102723-01 Installing the IQ Outdoor Reset Option Card is the simpl
51APPENDIX I – IQ Control System (continued)IQ High Limit Option Cards add auxiliary temperature limit-rated controls to ES2 Boilers. High Limit Opti
52APPENDIX I – IQ Control System (continued)Part Number Item Description102723-01Outside Reset IQ Option Card, Domestic Hot Water Priority, for use wi
53NOTES
54NOTES
55NOTES
56U.S. Boiler Company, Inc.P.O. Box 3020Lancaster, PA 176041-888-432-8887www.usboiler.net
6Installation: 1. Unpack the crate ... 7 2. Position t
7 THE BOILER IS TOP-HEAVY. Do not allow it to tip over.1. Remove the sleeve. 2. Remove the contents from the skid, except the boiler.
82. POSITION THE BOILER WARNINGS1. Slide the boiler into desired location.2. Meet the minimum clearances to combustible construction per the Speci
94-a3. PROVIDE COMBUSTION AIR INSUFFICIENT COMBUSTION AIR SUPPLY may result in the production and release of deadly carbon monoxide (CO
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