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Summary of Contents for Steffes 3120
- Page 1 CP14 "Manufactured in North America" OWNER'S AND INSTALLER'S MANUAL COMFORT PLUS Forced Air Heating Systems 3100 Series 4100 Series Models: 3120, 4120, 4130, & 4140 Applicable to Software Version 140-159 U.S. Pat. #5201024, #5086493 Can. Pat. #2059158, #2060881...
- Page 2 This manual should be retained by the owner upon completion of the installa- tion and made available to service personnel as required. Disclaimer: In compiling this manual, Steffes Corporation has used its best judgement based upon information available, but disclaims any responsibility...
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Page 3: Safety Precautions
SAFETY PRECAUTIONS WARNING 1. DO NOT energize the Comfort Plus while disassembled or without ceramic heat storage brick in place. Hazardous Voltage: Risk of elec- 2. DO NOT use or store materials that may produce explo- tric shock. Can cause injury or sive or flammable gases near the Comfort Plus. -
Page 4: Table Of Contents
Table of Contents Operation General Operation ..................................1.01 System Use During Construction Phase ............................1.01 System Start-Up ................................... 1.01 Turning System "OFF" and "ON" ............................... 1.01 Control Panel ....................................1.02 Operating Status ..................................1.02 Room Temperature Control ................................1.03 Brick Core Charge Control ................................1.03 Charge Control Override ................................ -
Page 5: General Operation
(“stand alone” furnace) or as a supplement to ducted heating systems such as heat pumps. SYSTEM USE DURING CONSTRUCTION PHASE Like most heating equipment manufacturers, Steffes strongly recommends that “Construction Heating Units” be used instead of the permanent heating system during the construction phase of a new home. Use of the permanent heating system during this phase may contaminate the duct system and/or internal areas of the heating system. -
Page 6: Control Panel
STEFFES CORPORATION AM and PM Indicator Lights The AM and PM indicator lights are only utilized if the Steffes Time Clock Module is being installed. With this module installed, the system displays time on AM/PM intervals and the corresponding light flashes. The system can be configured to display military time, in which case, both the AM and PM lights illuminate. -
Page 7: Room Temperature Control
ROOM TEMPERATURE CONTROL The room temperature set point is adjusted at the wall thermostat. If room temperature drops below the thermo- stat set point, the thermostat initiates a heat call and energizes the blowers in the Comfort Plus heating system. The variable speed core blower(s) automatically adjust speed in relation to brick core temperature and duct temperature to circulate room air through the brick core. -
Page 8: Installation
The information below describes the items shipped with each system. INFORMATION PACKAGE HEATING ELEMENTS (includes Owner's Manual and Warranty Registration Card) MODEL ELEMENTS 3120 4120 4130 4140 (shipped inside the base of the Comfort Plus) (adhered to outer side of shipping box) -
Page 9: Placement And Clearance Requirements
0" MIN CLEARANCE TO DUCTING O" MIN 1" TOP VIEW CLEARANCE " (BACK) " 27" 1" " TOP VIEW FRONT VIEW STEFFES " " 0" MIN CLEARANCE 4" MIN TO RETURN " CLEARANCE AIR DUCT 36" MIN CLEARANCE (FRONT) 16" "... -
Page 10: Initial Set-Up
(IN COLD AIR RETURN) 6" MIN CLEARANCE " 2" MIN CLEARANCE FILTER TRAY 48" FRONT VIEW 0" REQUIRED 0" REQUIRED CLEARANCE CLEARANCE 4140 " " STEFFES (± ") 4130 18" " " 4120 3" MIN CLEARANCE " " TOP VIEW " " "... -
Page 11: Brick Loading
(the notched brick piece) MUST be installed in the front rows. NOTCH IN BRICK HALF BRICK 3120: Does not contain half brick 4120: Load in row 5 4130: Load in row 4 and 8 4140: Load in row 6 and 12... -
Page 12: Heating Element And Air Channel Installation
HEATING ELEMENT AND AIR CHANNEL INSTALLATION Step 1 After all brick are loaded, insert the heating elements between the WARNING brick layers, sliding them in until the element ends embed into the side cutouts of the brick cavity. HAZARDOUS VOLTAGE: Risk of 3100 Series: The threaded screw tabs on the wire connection electric shock, injury, or death. -
Page 13: Brick Core Temperature Sensor Installation - 4100 Series Only
BRICK CORE TEMPERATURE SENSOR INSTALLATION - 4100 SERIES ONLY CAUTION Step 1 Remove the screw(s) by the brick core temperature sensor hole(s) in the galvanized front panel. Risk of improper operation. Models 4130 and 4140 have an upper and a lower brick Proper installation of the core temperature sensor. - Page 14 SYSTEM AIR DELIVERY MATRIX STATIC PRESSURE (INCHES WATER COLUMN) (External static pressure should not exceed .75 inches water column.) Supply Air Blower Speed 0.10 0.25 0.50 0.75 High (CFM) 1850 1560 1350 Medium High (CFM) 1800 1780 1470 1240 Medium Low (CFM) 1610 1580 1420...
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Page 15: Air Conditioner/Heat Pump Interface
(blower) system. If the plenum. If not using a Steffes supplied return air plenum, the application requires multiple Com- fort Plus systems or it is necessary to... -
Page 16: Line Voltage Electrical Connections
LINE VOLTAGE ELECTRICAL CONNECTIONS In standard configuration, the Comfort Plus is wired for connec- tion to 240V, however, the element circuits can also be con- WARNING nected to 208V. A 208V connection derates the charging input of the system by 25%. If a system rated specifically for 208V HAZARDOUS VOLTAGE: Risk of electric or 277V is required, contact the factory. -
Page 17: Low Voltage Electrical Connections
POWER LINE CARRIER (PLC) PEAK CONTROL The Steffes Power Line Carrier (PLC) control system has the ability to communicate with the system through the existing electrical circuits in the structure. With the power line carrier option, direct wired low voltage connections from the power company's peak signaling switch connect directly to the transmitting device. - Page 18 The outdoor temperature sensor can be installed in one of two ways: direct wired to the system or wired to the Steffes power line carrier system. The Comfort Plus is factory configured for automatic charge control with a direct wired outdoor sensor. Refer to the Configuration Menu (Pages 2.14-2.15) for information on the appropriate settings for the application.
- Page 19 24 VAC. (Contact the factory for more information on the thermostats available from Steffes.) Optimal placement of the room thermostat is on an interior wall in the main living area where it is not affected by direct sunlight or other abnormal temperatures.
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Page 20: Auxiliary Load Control
LOW VOLTAGE CONNECTIONS CONVENTIONAL FURNACE APPLICATION (SHOWN WITH UNCONTROLLED AIR CONDITIONING SYSTEM) FIGURE 13 Honeywell TH5110D Air Conditioner Connections (If being used in the application) Outdoor Sensor Optional Freeze Protection Room Sensor Terminals for Connection OS SC as a Conventional Furnace Comfort Plus 12 Position Terminal Block If installing a mechanical thermostat or thermostat with anticipator, a resistor kit is required (Order Item #1190015). -
Page 21: Configuration Menu
C003 Power Line Carrier (PLC) Channel Selection - If using PLC communication, this setting must match the channel setting in the Steffes PLC transmitting device. A value of zero indicates power line carrier communication is disabled. C004... - Page 22 Currently not utilized in the 3100/4100 Comfort Plus systems. C013-C021 Time Clock Module Configuration - These configuration settings are used to configure the peak control times when utilizing the optional Steffes Time Clock Module. Refer to the installation and configuration instructions included with the module for more information.
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Page 23: Installer's Final Check-Out Procedure
Verify, once again, that the Operating Mode displayed on the control panel corresponds with the power company's peak control signal. Step 10 In applications utilizing the Steffes Power Line Carrier control system, complete the Installer’s Final Check-out Procedure in the Owner’s and Installer’s Manual provided with that device. -
Page 24: Appendix
Appendix SPECIFICATIONS Appendix A.01 Comfort Plus... -
Page 25: Disassembling The 4100 Series Comfort Plus System
DISASSEMBLING THE 4100 SERIES COMFORT PLUS SYSTEM Step 1 Remove the painted front panel of the brick storage cabinet by removing the sheet metal screws along the top, bottom, and sides of the panel. Detach by pulling the bottom of the panel forward and down. Step 2 Remove the limit zone cover. -
Page 26: Parts Diagram - 3100 Series
PARTS DIAGRAM - 3100 SERIES Appendix A.03 Comfort Plus... -
Page 27: Parts List - 3100 Series
PARTS LIST - 3100 SERIES When ordering parts, please include the system model and serial numbers. DWG. 3120 REF. NO. DESCRIPTION ITEM NO. Front Painted Panel, Right Side 5940728 Electrical Panel Cover 5940794 Front Galvanized Panel 5940770 Standoffs, Front 5940774... -
Page 28: Parts Diagram - 4100 Series
PARTS DIAGRAM - 4100 SERIES Appendix A.05 Comfort Plus... -
Page 29: Parts List - 4100 Series
PARTS LIST - 4100 SERIES When ordering parts, please include the system model and serial numbers. DWG. REF. DESCRIPTION 4120 4130 4140 ITEM NO. ITEM NO. ITEM NO. Electrical Panel Cover 5940553 5940552 5940552 Front Painted Panel 5940589 5940526 5940588 PCB Relay Expansion Board 1023067 1023067... - Page 30 PARTS LIST - 4100 SERIES CONTINUED When ordering parts, please include the system model and serial numbers. DWG. REF. DESCRIPTION 4120 4130 4140 ITEM NO. ITEM NO. ITEM NO. Back Bottom Base Painted Panel 5940582 5940582 5940582 Left Side Bottom Painted Panel 5940594 5940594 5940594...
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Page 31: Internal System Wiring Diagrams - Line Voltage
INTERNAL SYSTEM WIRING DIAGRAMS - LINE VOLTAGE Line Voltage Wiring Diagram - Model 3120 240V OR 208V SYSTEMS ONLY Use copper or aluminum conductors rated for 75 C or higher for field connection of this device. SEE NOTE 2 SUPPLY AIR BLOWER... - Page 32 Line Voltage Wiring Diagram - Model 4120 240V OR 208V SYSTEMS ONLY Use copper or aluminum conductors rated for 75 C or higher for field connection of this device. SEE NOTE 2 SUPPLY AIR BLOWER MANUAL RESET WHITE 190 ° BLUE COM.
- Page 33 Line Voltage Wiring Diagram - Model 4130 240V OR 208V SYSTEMS ONLY Use copper or aluminum conductors rated for 75 C or higher for field connection of this device. SUPPLY AIR BLOWER MANUAL RESET SEE NOTE 2 WHITE 190 ° BLUE COM.
- Page 34 Line Voltage Wiring Diagram - Model 4140 240V OR 208V SYSTEMS ONLY Use copper or aluminum conductors rated for 75 C or higher for field connection of this device. SUPPLY AIR BLOWER MANUAL RESET WHITE SEE NOTE 2 190 ° BLUE COM.
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Page 35: Internal System Wiring Diagram - Low Voltage
(30 VA maximum). Risk of electric shock, injury, or death. All low voltage wiring must be segregated from line voltage circuits in the system. UPPER CORE THERMOCOUPLE YELLOW 3120/4130/4140 LOWER CORE THERMOCOUPLE YELLOW 3120/4120/4130/4140 YELLOW YELLOW/BLUE ORANGE ORANGE/BLUE... -
Page 36: Help Menu
HELP MENU The Comfort Plus contains a Help Menu which may be accessed through the control panel. To access the Help Menu, press and release the M button until the faceplate displays “HELP”. Scroll through the menu by pressing either the up or the down arrow button. Display Reading Description... - Page 37 There is no communication occurring with the second relay expansion board. The interface cable may be defective or the second expansion board may be unresponsive. There is no communication occurring with the Steffes Time Clock Module. Temperature sensor offset/reference is out of range and indicates that one of the sensors or the core thermocouple may be shorted to ground or the processor control board may be out of calibration.
- Page 38 GLOSSAR OSSAR OSSAR OSSAR OSSARY Y Y Y Y Anticipated Peak ~ Manual Charge Control Used only by certain power ~ Method of brick core companies as an alternative method of storing heat in charge regulation where the owner must periodically the brick core.
- Page 40 (5) years of the date of installation and which Steffes’ examination of the returned appliance or part(s) shall verify to Steffes’...
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Do you have a question about the 3120 and is the answer not in the manual?
Questions and answers
STS model 3120 was installed in 2005. Now the brick does not got hot despite the blower and the thermostat work
The Steffes STS model 3120 may not be heating the brick core despite the blower and thermostat working due to several possible reasons:
1. Brick Core Charge Settings – If the system is using automatic charge control, the outdoor temperature settings (C001 and C002) may not be correctly configured, preventing the system from initiating or completing the charging process.
2. Power Line Carrier (PLC) Communication – If the system relies on PLC signals for control, the PLC channel setting (C003) must match the transmitting device. A value of zero disables PLC communication, which could prevent charging.
3. Control Switch Configuration (C005) – If utilizing power line carrier control, the Steffes Time Clock Module, or line voltage peak control, this value must be set correctly. An incorrect setting could prevent the system from charging.
4. Utility Peak Conditions – If the system is designed to charge during off-peak periods, but the utility company’s peak control prevents charging at certain times, the brick core may not receive heat.
5. Construction Phase Contamination – If the system was used during construction, the duct system or internal components might be contaminated, affecting performance.
Checking these settings and conditions can help determine why the brick core is not heating.
This answer is automatically generated
It seems that the brick is not hot despite the **** and thermostat works well The STS 312 model was installed in 2005
The brick in the Steffes STS 312 model may not be hot despite the thermostat working well due to several possible reasons:
1. Outdoor Temperature and Utility Peak Conditions – The amount of heat stored in the brick core varies based on outdoor temperature and utility peak conditions. If these factors limit charging, the brick may not heat sufficiently.
2. Owner Preference Settings – If the heat storage settings are too low, the system may not store enough heat in the brick core.
3. Core Blower Issues – The variable speed core blower must function correctly to circulate air through the brick core. If it is not working, heat may not be effectively distributed.
4. Heating System Contamination – If the system was used during construction, dust or debris may have contaminated internal components, affecting performance.
Checking the system settings, ensuring proper blower operation, and verifying heat storage conditions can help diagnose and resolve the issue.
This answer is automatically generated