UTICA BOILERS SSC UBSSC-075 Installation Operation & Maintenance

Wall mounted gas boiler

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Installation, operation & maintanance manual (72 pages)

Installation, operation & maintenance manual (88 pages)

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Models

UBSSC

050

UBSSC-075

UBSSC-100

UBSSC-150

UBSSC-200

UBSSC-299

An ISO 9001-2008 Certified Company

WALL MOUNTED

INSTALLATION, OPERATION &

MAINTENANCE MANUAL

Manufactured by:

ECR International, Inc.

2201 Dwyer Avenue, Utica NY 13504-4729

web site: www.ecrinternational.com

GAS BOILER

050/075/100/150

050/075/100/150/200

SIZE SHOWN

P/N# 240008845, Rev. G [06/2013]

Table of Contents

Summary of Contents for UTICA BOILERS SSC UBSSC-075

Page 1 WALL MOUNTED GAS BOILER Models UBSSC INSTALLATION, OPERATION & UBSSC-075 UBSSC-100 MAINTENANCE MANUAL MAINTENANCE MANUAL UBSSC-150 UBSSC-200 UBSSC-299 050/075/100/150/200 050/075/100/150 SIZE SHOWN SIZE SHOWN Manufactured by: ECR International, Inc. 2201 Dwyer Avenue, Utica NY 13504-4729 An ISO 9001-2008 Certified Company P/N# 240008845, Rev. G [06/2013] web site: www.ecrinternational.com...
Page 2 VERIFY CONTENTS RECEIVED Description Illustration Item 299 SIZE SHOWN Fully Assembled Boiler Metal Wall Bracket Lag Bolt, 3/8" x 3" Hex (4 ea) Safety Relief Valve 3/4" Tee 3/4" Nipple 3/4" x 1/4" Elbow Air Vent Temperature Pressure Gauge Bushing 3/4" x 1/4" 3/4"...
Page 3 OVERALL DIMENSIONS Combustion Air Vent Connector Safety Relief Valve Connection (¾ NPT) Wall Hanging Bracket Table 1 : Physical Data Models 050/075/100 150/200 Width (A) 20" (508mm) 23" (584mm) Height (B) 30" (762mm) 41" (1041mm) 16.0" 18.3" Depth (C) 14" (356mm) (406mm) (465mm) Bracket (D)
Page 4: Table Of Contents
TABLE OF CONTENTS 1 - Introduction ......................... 5 2 - Important Safety Information ....................6 3 - Component Listing ....................... 7 4 - Locating Boiler ........................11 5 - Hydronic Piping ........................13 5.2 Special Conditions ......................13 5.3 Safety Relief Valve And Air Vent ..................13 5.4 Trim Piping ........................
Page 5: Introduction
1 - INTRODUCTION 1.1 Designated Use • Hot water heating boiler. • Indoor installation. • Closet or alcove installation. • Direct vent boiler. • For use with natural gas or liqueﬁ ed petroleum gases (LP/propane). 1.2 The unit MUST NOT: •...
Page 6: Important Safety Information
2 - IMPORTANT SAFETY INFORMATION 2.1 General 2.3 Installation shall conform to requirements of authority having jurisdiction or in absence of such Boiler installation shall be completed by qualiﬁ ed agency. requirements: See glossary for additional information. • United States WARNING •...
Page 7: Component Listing
3 - COMPONENT LISTING 3.1 Component Listing - Refer to diagrams on Gas (Control) Valve Gas (Control) Valve Delivers proper quantity of fuel Delivers proper quantity of fuel following pages. to Combustion Air Blower. See section 7. to Combustion Air Blower. See section 7. Supply Water Temperature Sensor and High Limit Supply Water Temperature Sensor and High Limit User Interface Displays information regarding boiler...
Page 8 3 - COMPONENT LISTING FIGURE 3-1 Boiler Components (Viewed from Back of Boiler) 050/075/100/150/200 NOTE: (28) AIR VENT (28) AIR VENT SIZE SHOWN See Section 5-3 (23) SAFETY RELIEF VALVE (23) SAFETY RELIEF VALVE For Safety Relief Valve Piping (25) VENT CONNECTOR Instructions (2) COMBUSTION...
Page 9 3 - COMPONENT LISTING FIGURE 3-4 Boiler Components 50/75/100 MBH (View from Front of Boiler) As seen on front cover NOTE: See Section 5 (28) AIR VENT (28) AIR VENT For Piping (23) SAFETY RELIEF VALVE (23) SAFETY RELIEF VALVE Instructions (25) VENT CONNECTOR (21) SUPPLY WATER...
Page 10 3 - COMPONENT LISTING FIGURE 3-5 Boiler Components 299 MBH (View from Front of Boiler) NOTE: See Section 5 (28) AIR VENT (28) AIR VENT For Piping (23) SAFETY RELIEF VALVE (23) SAFETY RELIEF VALVE Instructions (25) VENT CONNECTOR (2) COMBUSTION (21) SUPPLY WATER AIR INLET TEMPERATURE SENSOR &...
Page 11: Locating Boiler
4 - LOCATING BOILER 4.1 Boiler Location Considerations FIGURE 4-1 Clearance to Combustible Materials • Ambient room temperature always above 32°F (0°C) to prevent freezing of liquid condensate. • Approved for installation in closets. • Protect gas ignition system components from water (dripping, spraying, rain, etc.) during operation and service (circulator replacement, condensate trap, control replacement, etc.).
Page 12 4 - LOCATING BOILER FIGURE 4-2 Wall Mount Bracket Engaged with Pre-pipe supply and return water connections Bracket on Boiler with factory ﬁ ttings before wall mounting. Center brackets. Avoid 4.3 Wall Mounting overhang on sides of Mount boiler on wall using wall mounting bracket included wall mount bracket.
Page 13: Hydronic Piping
5 - HYDRONIC PIPING 5.1 General WARNING • Install piping in accordance with authority having jurisdiction. • Poison hazard. Ethylene glycol is toxic. Do not NOTICE use ethylene glycol. Use two (2) wrenches when tightening and ﬁ tting • Never use automotive or standard glycol antifreeze, to pipe boiler's threaded ﬁ...
Page 14: Trim Piping
5 - HYDRONIC PIPING • Install discharge piping from safety relief valve. See WARNING ﬁ gure 5-2. Burn and scald hazard. Safety relief valve could • Use ¾" or larger pipe. discharge steam or hot water during operation. • Use pipe suitable for temperatures of 375°F (191°C) Install discharge piping per these instructions.
Page 15 5 - HYDRONIC PIPING Piping Legend NOTICE Illustrations are meant to show system piping concept only. Installer responsible for all equipment and detailing required by authority having jurisdiction. FIGURE 5-4 System Piping Safety Relief Valve WALL MOUNTED ONLY System System Supply Return Pipe to...
Page 16 5 - HYDRONIC PIPING FIGURE 5-5 Single Boiler Two-Pipe Zoned System With Zone Valves Pump CH/System Heat exchanger Pump ball valve open (as shipped) 3/8"/10mm Open Wrench FIGURE 5-6 Single Boiler Two-Pipe Zoned System With Zone Pumps Pump Heat exchanger ball valve open Zone (as shipped)
Page 17 5 - HYDRONIC PIPING FIGURE 5-7A Single Boiler Using Primary/Secondary Pumping With Closed External Primary Loop Heating Load Heating Load 12"(305mm) Maximum separation Heating Load 12"(305mm) Maximum separation Existing closely spaced tees in primary system loop Limit length CH/System Pump 5' (1.6m) Heating system with existing...
Page 18 5 - HYDRONIC PIPING FIGURE 5-8A Multiple Boiler Two Pipe Zoned System With Zone Valves - (See Multiple Boiler Guide) Pump CH/System Pump 12"/305mm Maximum Separation Size common piping System per maximum heat Temperature capacity of entire Sensor system Limit length to 5' (1.6m) All internal...
Page 19 5 - HYDRONIC PIPING FIGURE 5-8B Multiple Boilers Using Primary/Secondary Pumping with Closed External Primary Loop Heating Load Heating Load 12"/305mm Maximum Separation Heating Load 12"/305mm Existing closely spaced tees Maximum in primary system loop Separation CH/System Pump System Size common piping Temperature per maximum heat Sensor...
Page 20 5 - HYDRONIC PIPING 5-8C Multiple Boilers Using Primary/Secondary Pumping with Open External Primary Loop 12"/305mm Maximum Separation Existing closely spaced tees 12"/305mm in primary system loop Maximum Separation CH/System Pump System Size common piping Temperature per maximum heat Sensor capacity of entire system Limit...
Page 21: Combustion Air And Vent Piping
6 - COMBUSTION AIR AND VENT PIPING 6.1 General • Any improper operation of common venting system should be corrected so installation conforms with National This boiler requires a dedicated direct vent system. Fuel Code, ANSI Z223.1/NFPA 54 and/or Natural Gas Install combustion air and vent piping in accordance and Propane Installation Code, CAN/CSA B149.1.
Page 22: Pipe Installation
6 - COMBUSTION AIR AND VENT PIPING 6.4 Vent Pipe Installation • Canadian installations only. All venting material, primer and glue must be listed to ULC S636. • Minimum and maximum combustion air and vent pipe lengths listed in Table 5. Pipe length counted from •...
Page 23: Venting Confi Gurations
6 - COMBUSTION AIR AND VENT PIPING 6.6 Venting Conﬁ gurations NOTICE Various venting conﬁ gurations can be applied to this boiler. Use of vent covers may cause freezing. If using For guidance see Venting Conﬁ guration Table 7 and vent covers overall vent length must be considered.
Page 24 6 - COMBUSTION AIR AND VENT PIPING FIGURE 6-1 Two Pipe Roof Vent 3" (80mm)  3" (80mm) Minimum horizontal Minimum separation between combustion air intake and vent of same appliance. 12" (305mm) 15" (381mm)  8" (203mm) Minimum vertical Minimum Maximum Roof Line...
Page 25 6 - COMBUSTION AIR AND VENT PIPING FIGURE 6-4 Side Wall Concentric Terminal FIGURE 6-5 Side Wall Concentric Terminal Multiple Appliances Roof 1"(2.54cm) Overhang 1" (25mm) Maximum 1" (25.4mm) Maximum Maximum 12" (305mm) Minimum * See Note 36"(0.9m(457mm) Below (28m)) Minimum Vent Maintain 12"...
Page 26 6 - COMBUSTION AIR AND VENT PIPING FIGURE 6-7 Concentric Roof Terminal Vent  Glue inner vent pipe to prevent Maintain 12"(305mm) US recirculation. (18"(457mm) Canada) clearance above highest  Maintain 12" (305mm) US anticipated snow level 24" (18"(457mm) Canada) minimum Combustion Air (610mm) above roof clearance above highest...
Page 27 6 - COMBUSTION AIR AND VENT PIPING FIGURE 6-10 Flue on Sidewall, Combustion Air on Roof NOTICE Maintain 12"(305mm) US (18"(457mm) Canada) Conﬁ gurations of single pipe vent with ﬂ ue on the clearance above highest Combustion sidewall, requires a tee as the vent terminal. See anticipated snow level 24"...
Page 28: Side Venting Terminal Requirements
6 - COMBUSTION AIR AND VENT PIPING 6.7 Side Venting Terminal Requirements of • USA - National Fuel Gas Code, ANSI 223.1/NFPA 54. • Canada - Natural Gas and Propane Installation Code, CAN/CSA B149.1 Venting terminal from doors and windows See ﬁ...
Page 29 6 - COMBUSTION AIR AND VENT PIPING FIGURE 6-15 Keep vent termination 3’ minimum Vegetation, (0.9m) away from vegetation. Position Plants & termination where vent vapors will not Shrubs damage plants/shrubs or air conditioning equipment. Termination Vent termination US only - 4’ (1.2m), Meters, Canada - 6' (1.9m) horizontally from, Regulators,...
Page 30: Multiple Boiler Venting Installation
6 - COMBUSTION AIR AND VENT PIPING 6.8 Multiple Boiler Venting Installation Table 8 - Minimum Diameter for Individual Boiler in Common Venting System • Multiple boiler application boiler can vent individually or use common vent pipes. Minimum Model • If boilers vent individually follow guidelines as Diameter described in ﬁ...
Page 31: Condensate Piping
6 - COMBUSTION AIR AND VENT PIPING FIGURE 6-18 Condensate Drain onde dens nsat Drai 6.9 Condensate Piping • Use materials acceptable to authority having jurisdiction. In absence of such authority: • USA - PVC or CPVC per ASTM D1785/D2845 Cement or primer per ASME D2564 or F493.
Page 32: Gas Supply Piping
7 - GAS SUPPLY PIPING FIGURE 7-1 Gas Connection CAUTION 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. •...
Page 33 7 - GAS SUPPLY PIPING FIGURE 7-2 Manual Main Gas Shutoff Valve Outside DANGER Boiler Jacket Fire Hazard. Do not use matches, candles, open ﬂ ames, or other methods providing ignition source. Failure to comply will result in death or serious injury.
Page 34: Electrical Connections
8 - ELECTRICAL CONNECTIONS 8.1 General WARNING Electrically bond boiler to ground in accordance with Electrical shock hazard. Turn OFF electrical power requirements of authority having jurisdiction. Refer to: supply at service panel before making electrical • USA- National Electrical Code, ANSI/NFPA 70. connections.
Page 35 8 - ELECTRICAL CONNECTIONS FIGURE Isolation Relays for CH System Pump and DHW Pump • Argus Link (Multiple boiler applications only) • Outdoor Sensor, if used. A. Provided with boiler. B. Locate outdoor sensor to protect against wind and direct sunlight. Mounting instructions provided with sensor.
Page 36: Start Up Procedure
9 - START UP PROCEDURE 9.1 Fill Boiler With Water And Purge Air NOTICE NOTICE IMPORTANT: Condensate trap must be manually ﬁ lled with water at initial start up. To maintain boiler efﬁ ciency and prevent boiling inside the heat exchanger, ﬂ ush entire heating FIGURE 9-1 Condensate Drain Assembly system until clean.
Page 37 9 - START UP PROCEDURE FIGURE 9 -2 User Interface IGURE 9 -2 User Interface 9.3 Program Boiler Control Description - Manual Lockout Reset - Enter/Exit user menu - Go to previous screen - Select a menu item - Conﬁ rm new parameter value - Scroll up to next menu item - Increase value - Scroll down to next menu item...
Page 38 9 - START UP PROCEDURE 9.4 Boiler Start-up and Operational Test 9.5 Check Combustion Verify air is purged from hydronic piping Natural Gas System test pumps - verify each pump is Measure input. English units* operational • Turn off gas to all other appliances. Verify gas piping •...
Page 39 9 - START UP PROCEDURE FIGURE 9-4 Gas Valve - Model 299 MBH Min. Max. Natural Gas <100ppm Propane 10.0 11.0 <150ppm NOTICE Contact Technical Support @ 800-325-5479 for additional information or assistance. Natural Gas only** Measure input. Compare to table above. Continue to measure input and CO until both measured values are within range speciﬁ...
Page 40: Perform Csd-1 Compliance Test
9 - START UP PROCEDURE 9.6 Perform CSD-1 Compliance Test (see WARNING paragraph 2.4 page 6) Asphyxiation hazard. Carbon monoxide is odorless, Verify operation of boiler safety control operation with tasteless, clear colorless gas, which is highly toxic. regard to no ﬂ ow conditions as follows: Verify cap is ﬁ...
Page 41: Complete Start Up Procedure
9 - START UP PROCEDURE FIGURE 9-8 Control Module J7 Connector 9.7 Complete Start Up Procedure Reset control parameters to operating settings if adjusted to allow startup and operation test. Follow instructions TO TURN OFF GAS TO APPLIANCE (page 42) if boiler is not being placed into immediate operation.
Page 42: Operating Instructions
10 - OPERATING INSTRUCTIONS FOR YOUR SAFETY READ BEFORE OPERATING CAUTION WARNING WHAT TO DO IF YOU SMELL GAS If you do not follow these instructions • Do not try to light any appliance. exactly, a ﬁ re or explosion may result •...
Page 43: General Maintenance And Cleaning
11 - GENERAL MAINTENANCE AND CLEANING 11.1 Beginning of Each Heating Season DANGER • Check boiler area is free from combustible materials, Before servicing, turn off electrical power to boiler gasoline, and other ﬂ ammable vapors and liquids. at service switch. Close manual gas valve to turn •...
Page 44 11 - GENERAL MAINTENANCE AND CLEANING Figure 11-3 Condensate Trap - 050,075,100,150,200 11.2 Annual Shut Down Procedure • Follow instructions “To Turn Off Gas To Appliance” unless boiler is also used to supply domestic hot water. See section 10. • Drain system completely if system does not have antifreeze when heating system is to remain out of service during freezing weather.
Page 45 11 - GENERAL MAINTENANCE AND CLEANING • Remove ¼-20 hex ﬂ ange nuts securing condensate collector to heat exchanger using 7/16" deep well socket. See ﬁ gures 11-3 & 11-4. • Remove condensate collector assembly from heat exchanger and ﬂ ue pipe. •...
Page 46: Ratings And Capacities
12 - RATINGS AND CAPACITIES Table 13 - Sea Level Ratings SEA LEVEL RATINGS NATURAL AND PROPANE GASES Boiler Input Rate Heating Net AHRI (MBH) Size Capacity Rating, Water AFUE (MBH) (MBH) (1)(2) (1)(3) Maximum Minimum 95.0 95.0 95.0 95.0 94.0 94.0 1000 Btu/hr (British Thermal Units Per Hour)
Page 47: Trouble Shooting
13 - TROUBLE SHOOTING...
Page 48 13 - TROUBLE SHOOTING Go to Page For Screen Display Explanation Troubleshooting Control has blocking error for more than 20 Go to Page 50 hours in a row. Three unsuccessful ignition attempts in a row Go to Page 51 Open gas valve power circuit. May involve high temperature switch, gas valve, or gas Go to Page 50 valve relay in control module.
Page 49 13 - TROUBLE SHOOTING Go to Page For Screen Display Explanation Troubleshooting Low water cutoff sees no water. Go to Page 56 Flue temperature sensor sees temperature Go to Page 57 higher than 200°F. E 39 B l o c k i n g E r r o r F l u e G a s E r r o r Return water temperature sensor sees Go to Page 58...
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Page 64: Wiring Diagram
14 - WIRING DIAGRAM 14.1 Connection Diagram - 050/075/100/150/200 MBH EXTERNAL PUMP RELAY - LIMIT OF 1 AMP PER PUMP SEE SECTION 8...
Page 65 14 - WIRING DIAGRAM 14.2 Schematic Diagram of Ladder Form - 050/075/100/150/200 MBH POWER INDICATOR ARGUS GROUND CONTROL J13-2 FLAME SENSOR BURNER J16-1 LWCO IGNITION J16-4 J16-5 J9-1 J16-8 DC+/L J9-2 J9-6 J16-6 DATA/PWM J9-7 J16-7 HALL 120VAC J9-5 J16-3 J9-4 DC-/N J16-2...
Page 66 14 - WIRING DIAGRAM 14.3 Connection Diagram - 299 MBH EXTERNAL PUMP RELAY - LIMIT OF 1 AMP PER PUMP SEE SECTION 8...
Page 67 14 - WIRING DIAGRAM 14.4 Schematic Diagram of Ladder Form - 299 MBH POWER INDICATOR GROUND ARGUS CONTROL J13-2 FLAME SENSOR BURNER J16-1 IGNITION LWCO J16-4 J9-1 J16-5 DC+/L J9-2 J16-8 J9-6 DATA/PWM J9-7 J16-6 HALL 120VAC J9-5 J16-7 J9-4 DC-/N J16-3 J9-3...
Page 68: Glossary
15 - GLOSSARY • ANSI - American National Standards Institute, Inc. • GAS PIPE SIZES - Table 14 oversees creation and maintenance of voluntary consensus standards, including ANSI Z21.13/CSA 4.9: NATURAL GAS Gas-Fired Low Pressure Steam and Hot Water Boilers. Pipe Capacity - BTU Per Hour Input Includes Fittings Length of Pipe - Ft.
Page 69 15 - GLOSSARY • QUALIFIED AGENCY - Any individual, ﬁ rm, corporation, or company engaged in and responsible for: • Installation, testing, or replacement of gas piping, or connection, installation, testing, repair or servicing of appliances and equipment. • Experienced in such work. •...
Page 70: Appendix A - Control Module
APPENDIX A - CONTROL MODULE 1.1 Front Panel Status Indicators See Control Module Section for operational states of Front Panel Indicators and User Interface Display. POWER INDICATOR (Green) Light is lit when boiler power is ON. Light is lit when boiler is providing heat for CH or HEAT INDICATOR (Green) DHW.
Page 71: Introduction
APPENDIX A - CONTROL MODULE 2.1 Introduction Operation with LCD character display module Boiler is equipped with programmable electronic control and user interface module. 2.2 Operation • Display: 4 x 20 character LCD screen to show boiler status. • Function Keys Description - Manual Lockout Reset - Enter/Exit user menu...
Page 72: Sequence Of Operation
APPENDIX A - CONTROL MODULE 2.4 Sequence of Operation Front Panel Operational State User Interface Display Explanation Indica- tors  Boiler operates in standby mode until demand for Central Heat  (CH) or Domestic Hot Water Heat  (DHW) is detected. Demand? CH or DHW pump is turned on based on type of heating...
Page 73 APPENDIX A - CONTROL MODULE 2.4 Sequence of Operation Operational State User Interface Display Explanation If ﬂ ame detected before Gas Valve After 2 seconds opens during ignition boiler will  lockout.  Lockout Flame Error A21 Detected? Please refer to troubleshooting ...
Page 74: Theory Of Operation
APPENDIX A - CONTROL MODULE 2.5 Theory of Operation Explanation User Interface Display Boiler operates in standby mode until demand for Central Heat (CH) or Domestic Hot Water (DHW) is detected. User Menu User Menu structure includes: • ‘Boiler Status’ submenu– User can monitor general boiler status parameters such as sensor temperatures and pump operation.
Page 75 APPENDIX A - CONTROL MODULE Explanation User Interface Display Adjust CH set point to hydronic system design while in Operating in CH Mode = 0 (CH with Thermostat) or 3 (Permanent Demand). In CH Mode = 1 (CH with Thermostat and Outdoor Reset) or 2 (CH with Full Outdoor Reset).
Page 76 APPENDIX A - CONTROL MODULE Explanation User Interface Display Installer Menu Installer Menu structure includes: • User Menu can be accessed by pressing ‘Menu’ key on user interface. Installer Menu can be accessed by simultaneously holding ‘Menu’ and ‘Enter’ keys for 5 seconds.
Page 77 APPENDIX A - CONTROL MODULE Explanation User Interface Display Installer Menu Control module logs successful and failed ignition attempts. Information accessed in ‘Ignition Attempts’ Screen as shown. Ignition attempts are stored in non-volatile memory and are retained in event of power failure. Figure A-1 Typical Ignition Cycle Following control features are implemented to ensure safe and reliable operation of Combustion System:...
Page 78 APPENDIX A - CONTROL MODULE Explanation User Interface Display Boiler stores information regarding total CH and DHW run time in hours. Data stored in non-volatile memory and retained in event of power failure. Boiler logs last 16 blocking errors and 16 lockout errors in non-volatile memory.
Page 79 APPENDIX A - CONTROL MODULE Explanation User Interface Display Two pump modes are available: Pump Mode = 0 ‘CH or CH&DHW’ • In this mode either CH or DHW pump terminal is energized depending on type of demand (CH or DHW). •...
Page 80 APPENDIX A - CONTROL MODULE Explanation User Interface Display 4. Central Heating (CH) modes available: • CH Mode = 0 ‘CH with Thermostat’ • Boiler will attempt to satisfy CH demand while CH thermostat input is closed. • Boiler will modulate its ﬁ ring rate to maintain CH set point and match system heat load.
Page 81 APPENDIX A - CONTROL MODULE Explanation User Interface Display If outdoor temperature is greater than Warm Weather Shutdown Temperature, demand for CH blocked and pumps stopped. Allowed Range: 35°F to 100°F (2°C to 38°C) Default Setting: 70°F (21°C) Boiler capable of operating in Outdoor Reset Mode when included Outdoor Sensor is connected and proper CH Mode selected.
Page 82 APPENDIX A - CONTROL MODULE Explanation User Interface Display Outdoor reset boost function increases CH set point by increment (‘Temp’) if CH demand continues beyond pre-set time limit (‘Time’). CH set point will continue to increase until set point reaches 195°F / 91°C Allowable Temperature Increment: 0..36 °F (0..20 °C) Default Temperature increment:...
Page 83 APPENDIX A - CONTROL MODULE Explanation User Interface Display Maximum time boiler operates in DHW mode limited by DHW Maximum Priority Time Setting. Priority timer starts when both CH and DHW demand is present. Boiler will switch from DHW back to CH operation after Maximum Priority Time has elapsed.
Page 84 ECR International, Inc 2201 Dwyer Avenue, Utica NY 13501 web site: www.ecrinternational.com...

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UTICA BOILERS SSC UBSSC-075 Installation Operation & Maintenance

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