UTICA BOILERS UBSSC-299 Installation, Operation & Maintenance Manual
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UTICA BOILERS UBSSC-299 Installation, Operation & Maintenance Manual

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Models
-
UBSSC
050
UBSSC-075
UBSSC-100
UBSSC-150
UBSSC-200
UBSSC-299
050/075/100
SIZE SHOWN
WALL MOUNTED
GAS BOILER
INSTALLATION, OPERATION &
MAINTENANCE MANUAL
Manufactured by:
ECR International Inc.
2201 Dwyer Avenue, Utica, NY 13501
Tel. 800 325 5479
www.ecrinternational.com
PN 240011320 REV. G [10/01/2021]

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Summary of Contents for UTICA BOILERS UBSSC-299

  • Page 1 WALL MOUNTED GAS BOILER INSTALLATION, OPERATION & MAINTENANCE MANUAL Models UBSSC UBSSC-075 UBSSC-100 UBSSC-150 UBSSC-200 UBSSC-299 050/075/100 SIZE SHOWN Manufactured by: ECR International Inc. 2201 Dwyer Avenue, Utica, NY 13501 Tel. 800 325 5479 www.ecrinternational.com PN 240011320 REV. G [10/01/2021]...
  • Page 2 VERIFY CONTENTS RECEIVED **Temperature *Safety Relief Valve Metal Wall Bracket Pressure Gauge Fully Assembled Boiler w/ 3/4" Tee, 3/4" Nipple, w/ Lag Bolt, 3/8" x 3" Hex w/ 3/4" x 1/4" Bushing, (50-100 size shown) 3/4" x 1/4" Elbow (4 ea) 3/4"...

  • Page 3: Table Of Contents

    TABLE OF CONTENTS 1 - Important Safety Information ......6 Appendix A - Control Module ......73 2 - Introduction ............7 1.1 Introduction ..........73 3 - Component Listing ..........8 1.2 Operation ..........73 4 - Locating Boiler ..........12 1.3 Status Indication ........73 5 - Hydronic Piping ..........14 1.4 Sequence of Operation ........74 5.2 Special Conditions ........14...
  • Page 4 PHYSICAL DATA Table 1: Physical Data Models 050/075/100 150/200 Width (A) 20" (508mm) 23" (584mm) Height (B) 31" (787mm) 42" (1067mm) Depth (C) 14-¾" (375mm) 16.0" (406mm) 18.4" (467mm) Bracket (D) 27.7" (704mm) 38.7" (983mm) Height (E) 32" (813mm) 43" (1092mm) Size (F) 1-1/4"...
  • Page 5 PHYSICAL DATA Dimensions Rear View Front View Wall Bracket Top View 50-200 Top View 299 Combustion Combustion Vent Connector Vent Connector Safety Relief Valve Safety Relief Valve Connection (¾ NPT) Connection (¾ NPT) Bottom View Bottom View Connection Connection Identification 50-100 MBH Identification 150-299 MBH Return Water (F) Return Water (F)

  • Page 6: Important Safety Information

    1 - IMPORTANT INFORMATION CAUTION 1. SAFETY INFORMATION WHAT TO DO IF YOU SMELL GAS Boiler installation shall be completed by qualified agency. See • Do not try to light any appliance. glossary for additional information. • Do not touch any electrical switch; do not use any phone in your building.

  • Page 7: Introduction

    2 - INTRODUCTION 2 - INTRODUCTION 2.4 Designated Use • Hot water heating boiler. 2.1 Installation shall conform to requirements of authority • Indoor installation. having jurisdiction or in absence of such requirements: • Closet or alcove installation. • United States •...

  • Page 8: Component Listing

    3 - COMPONENT LISTING Component Listing - Refer to diagrams on Supply Water Temperature Sensor and High Limit Supply Water Temperature Sensor and High Limit following pages. Switch Switch User Interface Displays information regarding boiler Low Water Cutoff Low Water Cutoff Senses inadequate quantity of Senses inadequate quantity of condition.
  • Page 9 3 - COMPONENT LISTING FIGURE 3-1 Boiler Components (Viewed from Back of Boiler) Air Vent Air Vent Safety Relief Valve Safety Relief Valve Vent Connector Combustion Air Inlet Wall Mount Support Bracket Wall Mount Support Bracket FIGURE 3-2 Jacket Removal -Viewed from Bottom of FIGURE 3-3 Jacket Removal -Viewed from Left Side of Boiler (50-100 MBH shown) Boiler (50-100 MBH shown)
  • Page 10 3 - COMPONENT LISTING FIGURE 3-4 Boiler Components 50/75/100 MBH (View from Front of Boiler) As seen on front cover Safety Relief Valve Safety Relief Valve Note See Section 5 For Piping Instructions Air Vent Air Vent Vent Connector Combustion Air Inlet Supply Water Temperature Sensor &...
  • Page 11 3 - COMPONENT LISTING FIGURE 3-55 Boiler Components 299 MBH (View from Front of Boiler) Safety Relief Valve Safety Relief Valve Note See Section 5 For Piping Instructions Air Vent Air Vent Vent Connector Vent Connector Combustion Air Inlet Combustion Air Inlet Supply Water Supply Water Temperature Sensor &...

  • Page 12: Locating Boiler

    4 - LOCATING BOILER 4.1 Boiler Location Considerations TABLE 2: BOILER CLEARANCES • Ambient room temperature always above 32°F (0°C) to Combustible Dimension Service prevent freezing of liquid condensate. (1)(2) Materials • Approved for installation in closets. Model 50/075/100/150/200/299 • Protect gas ignition system components from water Top (A) 0"...
  • Page 13 4 - LOCATING BOILER FIGURE 4-2 Wall Mount Bracket Engaged with CAUTION Bracket on Boiler Boiler weight exceeds 75 pounds (34 kg). Do not lift boiler onto wall without assistance. Lift boiler using chassis. Using front jacket, vent piping, water or gas fittings to lift boiler may cause Note Center brackets.

  • Page 14: Hydronic Piping

    5 - HYDRONIC PIPING 5.1 General Boiler rated at 150 psig (1.03 MPa) maximum Note • Install piping in accordance with authority having allowable working pressure. Boiler provided with jurisdiction. 30 psig (206 kPa) safety relief valve. Field source • Support system piping and safety relief valve discharge safety relief valve for system pressures greater piping.

  • Page 15: Safety Relief Valve And Air Vent

    5 - HYDRONIC PIPING 5.3 Safety Relief Valve and Air Vent WARNING • Install safety relief valve and air vent using pipe fittings Burn and scald hazard. Safety relief valve could provided with boiler. See figure 5-1 discharge steam or hot water during operation. Install discharge piping per these instructions.

  • Page 16: Trim Piping

    5 - HYDRONIC PIPING 5.4 Trim Piping FIGURE 5-3 Temperature Pressure Gauge and Drain Valve Installations • Temperature - Pressure Gauge. Install temperature pressure gauge using nipple, tee and bushing provided with boiler. See figure 5-3. • Drain Valve. Install drain valve using nipple, tee and bushing provided with boiler.
  • Page 17 5 - HYDRONIC PIPING Piping Legend Illustrations are meant to show system piping Note 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 Check Local...
  • Page 18 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 End Wrench may be required to turn valve FIGURE 5-6 Single Boiler Two-Pipe Zoned System With Zone Pumps Pump Heat exchanger ball valve open (as...
  • Page 19 5 - HYDRONIC PIPING FIGURE 5-7A Single Boiler Using Primary/Secondary Pumping With Closed External Primary Loop 12"(305mm) Maximum separation 12"(305mm) Maximum separation Existing closely spaced tees in primary system loop Limit length CH/System Pump 5' (1.6m) Heating system with existing primary loop.
  • Page 20 5 - HYDRONIC PIPING FIGURE 5-8A Multiple Boiler Using Primary Secondary Two Pipe Zoned System With Zone Valves Pump CH/System Pump 12"/305mm Maximum Separation System Size common piping per maximum heat Temperature capacity of entire Sensor system Limit length to 5' (1.6m) All internal primary loop ball...
  • Page 21 5 - HYDRONIC PIPING FIGURE 5-8B Multiple Boilers Using Primary/Secondary Pumping with Closed External Primary Loop 12"/305mm Maximum Separation 12"/305mm Existing closely spaced tees Maximum in primary system loop Separation CH/System Pump System Size common piping Temperature per maximum heat Sensor capacity of entire system Limit...
  • Page 22 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 length to...

  • Page 23: Combustion Air And Vent Piping

    6 - COMBUSTION AIR AND VENT PIPING 6.1 General Fuel Code, ANSI Z223.1/NFPA 54 and/or Natural Gas and Propane Installation Code, CAN/CSA B149.1. When This boiler requires a dedicated direct vent system. re-sizing any portion of common venting system, common Install combustion air and vent piping in accordance venting system should be re-sized to approach minimum with these instructions, authority having jurisdiction,...

  • Page 24: Pipe Installation

    6 - COMBUSTION AIR AND VENT PIPING 6.4 Vent Pipe Installation 6.5 Vent Termination • • Minimum and maximum combustion air and vent pipe • Terminate combustion air and vent pipes with fittings or lengths listed in Table 5. Pipe length counted from concentric vent kit.

  • Page 25: Venting Configurations

    6 - COMBUSTION AIR AND VENT PIPING 6.6 Venting Configurations Use of vent covers may cause freezing. If using Note Various venting configurations can be applied to this boiler. vent covers overall vent length must be considered. For guidance see Venting Configuration Table 7A and Failure to heed this information may compromise corresponding figures.
  • Page 26 6 - COMBUSTION AIR AND VENT PIPING FIGURE 6-1 Two Pipe Roof Vent 12" (205mm) Min. horizontal separation  12" (205mm) Min. between combustion air intake and vent of same appliance. 12" (305mm) Min. 15" 12" (205mm) Min. or greater separation ...
  • Page 27 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) 1" (25mm) Max. Overhang Maximum 1" (25.4mm) Max. 12" (305mm) Min. * See Note 36"(914mm) Min. Below Vent Maintain 12"...
  • Page 28 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)  Maintain 12" (305mm) US clearance above highest (18"(457mm) Canada) minimum anticipated snow level 24" Combustion Air (610mm) above roof clearance above highest anticipated...
  • Page 29 6 - COMBUSTION AIR AND VENT PIPING FIGURE 6-10 Flue on Sidewall, Combustion Air on Roof FIGURE 6-12 Two Pipe Side Wall with 45° Vent Combustion Vent Air Inlet 45° Elbow Upward 3" (76mm) Min. 24" (610mm) Max. Separation 12" (205mm) Min. 24"...

  • Page 30: Side Venting Terminal Requirements

    6 - COMBUSTION AIR AND VENT PIPING 6.7 Side Venting Terminal Requirements of • USA - National Fuel Gas Code, ANSI Z223.1/NFPA 54. Venting terminal from doors and windows See figure 6-15 Venting terminal from forced air inlet of other appliances See figure 6-16 Venting terminal from snow level See figure 6-17...
  • Page 31 6 - COMBUSTION AIR AND VENT PIPING FIGURE 6-18 Keep vent termination 3’ minimum Vegetation, (914mm) 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, no Regulators,...

  • Page 32: 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 Diameter •...

  • Page 33: Condensate Piping

    6 - COMBUSTION AIR AND VENT PIPING 6.9 Condensate Piping FIGURE 6-18 Condensate Drain (150-299 MBH shown) • 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 34: 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 35 7 - GAS SUPPLY PIPING FIGURE 7-2 Manual Main Gas Shutoff Valve Outside DANGER Boiler Jacket Fire Hazard. Do not use matches, candles, open flames, or other methods providing ignition source. Failure to comply will result in death or serious injury.

  • Page 36: 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 37 8 - ELECTRICAL CONNECTIONS FIGURE Isolation Relays for CH System Pump • Outdoor Sensor, if used. and DHW Pump A. Provided with boiler. B. Locate outdoor sensor to protect against wind and direct sunlight. Mounting instructions provided with sensor. C. Maximum wire length is 100 ft (30m) for 22 ga. wire, or 150 ft (45m) for 18 ga.

  • Page 38: Start Up Procedure

    9 - START UP PROCEDURE 9.1 Fill Boiler With Water And Purge Air Condensate trap must be manually filled with water Note To maintain boiler efficiency and prevent boiling at initial start up. Note inside the heat exchanger, flush entire heating FIGURE 9-1 Condensate Drain Assembly system until clean.
  • Page 39 9 - START UP PROCEDURE Figure 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 - Confirm new parameter value - Scroll up to next menu item - Increase value - Scroll down to next menu item - Decrease value...
  • Page 40 9 - START UP PROCEDURE 9.4 Boiler Start-up and Operational Test For Propane (LP): 9160 x cu ft Verify air is purged from hydronic piping Input (MBH) System test pumps - verify each pump is seconds operational using vibration, noise and amp draw. For Metric formulas- See Glossary Verify gas piping •...

  • Page 41: Complete Start Up Procedure

    9 - START UP PROCEDURE FIGURE 9-3 Gas Valve - Models WARNING 050/075/100/150/200 MBH Fire, explosion, asphyxiation and electrical shock hazard. Read this instruction and understand all requirements, including requirements of authority having jurisdiction before making adjustments. Failure Throttle Screw to follow these instructions could result in death or serious injury.
  • Page 42 9 - START UP PROCEDURE FIGURE 9-5 Offset Screw Location - Models LOW fire combustion - 50/75/100/150/200 MBH 050/075/100/150/200 MBH Flame signal Design μA Target Natural 8.8% 9.3% 9.0% <100ppm >3.3 Propane 9.8% 10.5% 10.0% White Plastic Offset Screw Is Located Under The Aluminum LOW fire combustion - 299 MBH Flame...

  • Page 43: Perform Csd-1 Compliance Test

    9 - START UP PROCEDURE 9.7 Perform CSD-1 Compliance Test (see WARNING paragraph 2.2 page 7) 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 flow conditions as follows: Verify cap is firmly placed on combustion analyzer Turn off boiler using boiler service switch.
  • Page 44 9 - START UP PROCEDURE 9.8 Complete Start Up Procedure 9-10 Control Module J7 Connector Reset control parameters to operating settings if adjusted to allow startup and operation test. Follow instructions TO TURN OFF GAS TO APPLIANCE (page 45) if boiler is not being placed into immediate operation.

  • Page 45: 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 fire or explosion may result causing •...

  • Page 46: General Maintenance And Cleaning

    11 - GENERAL MAINTENANCE AND CLEANING FIGURE 11-1 Sight Glass - 050/075/100/150/200 MBH DANGER Before servicing, turn off electrical power to boiler at service switch. Close manual gas valve to turn gas supply OFF to boiler. Failure to comply will result in death or serious injury.
  • Page 47 11 - GENERAL MAINTENANCE AND CLEANING 11.2 Annual Shut Down Procedure • Circulator pump and combustion air blower motor furnished with boiler are permanently lubricated from factory and • Follow instructions “To Turn Off Gas To Appliance” unless require no further lubrication. Lubricate field sourced boiler is also used to supply domestic hot water.
  • Page 48 11 - GENERAL MAINTENANCE AND CLEANING Remove ¼-20 hex flange nuts securing condensate collector to heat exchanger using 7/16" deep well socket. See figures 3-5 & 3-6. Remove condensate collector assembly from heat exchanger and flue pipe. Flush collector and condensate trap with water. •...

  • Page 49: Ratings And Capacities

    12 - RATINGS AND CAPACITIES TABLE 14: SEA LEVEL RATINGS NATURAL AND PROPANE GASES Net AHRI Rating, Boiler Input Rate (MBH) Heating Capacity Size Water (MBH) AFUE (1)(3) (MBH) (1)(2) Maximum Minimum 95.0 95.0 95.0 95.0 95.0 95.0 1000 Btu/hr (British Thermal Units Per Hour) Heating Capacity and AFUE (Annual Fuel Utilization Efficiency) are based on DOE (Department of Energy) test procedures.

  • Page 50: Trouble Shooting

    13 - TROUBLE SHOOTING PN 240011320 Rev. G 10/01/2021]...
  • Page 51 13 - TROUBLE SHOOTING Go to Page For Screen Display Explanation Troubleshooting Control has blocking error for more than 20 Go to Page 53 hours in a row. Three unsuccessful ignition attempts in a row Go to Page 54 Open gas valve power circuit. May involve high temperature switch, gas valve, or gas Go to Page 53 valve relay in control module.
  • Page 52 13 - TROUBLE SHOOTING Go to Page For Screen Display Explanation Troubleshooting Low water cutoff sees no water. Go to Page 59 Flue temperature sensor sees temperature B l o c k i n g E r r o r E 39 Go to Page 60 higher than 200°F.
  • Page 53 13 - TROUBLE SHOOTING PN 240011320 Rev. G 10/01/2021]...
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  • Page 67: Wiring Diagram

    14 - WIRING DIAGRAM 14.1 Connection Diagram - 050/075/100 MBH EXTERNAL PUMP RELAY - LIMIT OF 1 AMP PER PUMP SEE SECTION 8 PN 240011320 Rev. G 10/01/2021]...
  • Page 68 14 - WIRING DIAGRAM 14.2 Schematic Diagram of Ladder Form - 050/075/100 MBH LADDER DIAGRAM 50/75/100 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...
  • Page 69 14 - WIRING DIAGRAM 14.3 Connection Diagram - 150/200/299 MBH PN 240011320 Rev. G 10/01/2021]...
  • Page 70 14 - WIRING DIAGRAM 14.4 Schematic Diagram of Ladder Form - 150/200/299 MBH LADDER DIAGRAM 150/200/299 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 J9-7 DATA/PWM J16-6 HALL 120VAC J9-5 J16-7 J9-4 DC-/N J16-3...

  • Page 71: Glossary

    15 - GLOSSARY • ANSI - American National Standards Institute, • HIGH-VOLTAGE - Circuit involving potential of not more Inc. oversees creation and maintenance of voluntary than 600 volts and having circuit characteristics in excess of consensus standards, including ANSI Z21.13/CSA 4.9: Gas- those of low-voltage circuit.
  • Page 72 15 - GLOSSARY • PURGE - To free gas conduit of air or gas, or mixture of gas and air. • PURGE TIME - Period of time intended to allow for dissipation of any unburned gas or residual products of combustion.

  • Page 73: Appendix A - Control Module

    APPENDIX A - CONTROL MODULE 1.1 Introduction Operation with LCD character display module Boiler is equipped with programmable electronic control and user interface module. 1.2 Operation • Display: 4 x 20 character LCD screen to show boiler status. • Function Keys Description - Manual Lockout Reset - Enter/Exit user menu...

  • Page 74: Sequence Of Operation

    APPENDIX A - CONTROL MODULE 1.4 Sequence of Operation Operational State User Interface Display Explanation Boiler operates in standby mode until S t a n d b y : N o D e m a n d demand for Central Heat (CH) or Heat Domestic Hot Water (DHW) is detected.
  • Page 75 APPENDIX A - CONTROL MODULE 1.4 Sequence of Operation Operational State User Interface Display Explanation After 2 seconds If flame detected before Gas Valve opens during ignition boiler will lockout. Lockout Flame Error A21 Detected? Please refer to troubleshooting guide. Note: 5 Ignition trials,...

  • Page 76: User Menu

    APPENDIX A - CONTROL MODULE 1.5 User Menu Explanation User Interface Display Boiler operates in standby mode until demand for Central Heat (CH) or Domestic Hot Water (DHW) is detected. User Menu (Press Menu botton on user interface to access User Menu) User Menu structure includes: •...
  • Page 77 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 78 APPENDIX A - CONTROL MODULE Explanation User Interface Display 1.6 Installer Menu The Installer Menu structure includes: Installer Menu can be accessed by simultaneously holding ‘Menu’ and ‘Enter’ keys for 5 seconds. Installer 'Menu' can be accessed by first pressing and holding the 'Enter' key continue to hold and at the same time press and hold the 'Menu’...
  • Page 79 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 80 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 81 APPENDIX A - CONTROL MODULE Explanation User Interface Display Two pump modes are available: Pump Mode = 0 ‘CH or CH&DHW’ • In this mode either the CH or DHW pump terminal is energized depending on the type of demand (CH or DHW). •...
  • Page 82 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 firing rate to maintain CH set point and match system heat load.
  • Page 83 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 84 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 85 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 86 NOTES PN 240011320 Rev. G 10/01/2021]...
  • Page 87 SERVICE RECORD PN 240011320 Rev. G 10/01/2021]...
  • Page 88 IMPORTANT In accordance with Section 325 (f) (3) of the Energy Policy and Conservation Act, this boiler is equipped with a feature that saves energy by reducing the boiler water temperature as the heating load decreases. This feature is equipped with an override which is provided primarily to permit the use of an external energy management system that serves the same function.

This manual is also suitable for:

Ubssc-075Ubssc-100Ubssc-150Ubssc-200Ubssc-050

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