V2 "Manufactured in North America" COMFORT PLUS COMMERCIAL HYDRONIC HEATING SYSTEM Owners and Installers Manual Models: 7120, 7130 & 7140 Applicable to Software Version 2.
IMPORTANT w The equipment described herein is intended for installation by a qualified technician in compliance with applicable local, state, and national codes and requirements. w To insure proper installation and operation of this product, completely read all instructions prior to attempting to assemble, install, operate, maintain or repair this product. Upon unpacking of the system, inspect all parts for damage prior to installation and start-up.
SAFETY PRECAUTIONS 1. DO NOT energize this heating system while disassembled or without the ceramic heat storage brick in place. 2. DO NOT operate this heating system without the factory provided pressure relief valve in place. 3. DO NOT use or store materials that may produce explosive or flammable gases near the system. 4. DO NOT violate the placement and clearance requirements specified in this manual. (Page 3.02-3.03) 5. DO NOT place anything on top of the system. 6.
TC Table of Contents Operation General Operation .................................................................................................................................................................. 1.01 System Use During Construction Phase ................................................................................................................................ 1.01 System Start-up .........................................................................................................
Operation GENERAL OPERATION The Comfort Plus Commercial Hydronic system stores demand free or off-peak electricity in the form of heat. Operation of the heating system is automatic. During hours when energy costs are lower the system converts electricity to heat which is then stored in its ceramic brick core. The amount of heat stored in the brick core of the system varies in relation to outdoor temperature, current building load, utility peak conditions, and/or the heating requirements.
CONTROL PANEL Operation Operation of the Comfort Plus Commercial Hydronic system is automatic. All operational functions are stored in its microprocessor in function locations and are factory preset. If necessary, the installer can adjust them through the control panel. (See Figure 1.) Four-Digit LED Display The four digit LED displays specific operating information. During an editing process, the function locations and the values set in these locations are displayed for viewing and adjusting purposes.
TEMPERATURE CONTROL The versatility of this system allows it to fit many applications. The Comfort Plus Commercial Hydronic is designed for use as either the sole heating source (stand alone furnace) or as a supplement to ducted heating systems such as heat pumps. The Steffes Air Handler can be interfaced with a standard heat pump system and will provide comfort modulation.
2 Optional Accessories SINGLE ELECTRICAL FEED KIT The Steffes Comfort Plus Commercial systems have built-in circuit breakers. They are factory configured to be field connected to multiple line voltage circuits. If single feed to the element and blowers/control circuits is desired, the single feed kit is available to allow the system to be powered with a one, larger line voltage circuit. Contact the factory for ordering details.
18" STAND Some applications (such as garages) may require that the heating appliance be elevated in order to meet building codes. The 18" stand can be used to elevate the 7140 series Comfort Plus Commercial Hydronic system. It is shipped as a kit and requires field assembly. Support for the optional air handler is not provided. Order Item #1301585 Stand Stand AIR HANDLER - VARIABLE SPEED Accessories The Steffes Air Handler includes a return plenum, supply air blower, water coil, and air filter.
LOAD MANAGEMENT CONTROL The Comfort Plus Commercial Hydronic system is an Electric Thermal Storage (ETS) heating system using electricity to provide a low cost heating solution for commercial, industrial, and large residential applications. ETS equipment is designed to store electricity, as heat, during hours when energy costs are lower and kW demand charges are not incurred. The Comfort Plus Commercial's thermal mass consists of a high-density ceramic brick capable of vast heat storage.
SCR CONTROLLER The Steffes SCR (Solid State Relay Panel) is an optional control device used with the Steffes ThermElect (8100 and 9100 Series) and Comfort Plus Commercial (6100 and 7100 Series) Heating Systems. It utilizes SCR technology to enable more precise balancing of a buildings overall electric load by varying the amount of total element input that can be energized in a Steffes furnace at any given time in relation to the maximum allowable building load.
3 Installation CAUTION Risk of sharp edges. Can cause personal injury. Use caution when installing and/or servicing equipment. SHIPPING AND PACKAGING The Comfort Plus Commercial Hydronic should always be transported in an upright position to avoid damage to internal components and insulation materials.
PLACEMENT AND CLEARANCE REQUIREMENTS The physical dimensions (Figure 2) of the Comfort Plus Commercial Hydronic system along with the clearances required (Figure 3) MUST be taken into consideration when choosing its location within a structure. The best installation location for this system is in a space requiring heat, so some amount of the heating requirements can be satisfied through static dissipation from the warm outer panels of the system. Standby heat dissipation of up to 2.
If the Comfort Plus Commercial Hydronic is installed in an area where radiant heat coming from the system is undesired or where room temperatures may reach 85° Fahrenheit or greater, it is strongly recommended to install a Static Heat Recovery unit or Air Handler. Refer to pages 2.01-2.02 for information on these options. In addition to the physical space requirements, the weight of the Comfort Plus Commercial Hydronic must be taken into consideration when selecting the installation surface.
BRICK LOADING Load the brick, one row at a time, using a left side, right side, center pattern. Start at the back of the brick core and work forward. Make sure the brick are placed so the grooved side is facing up, the notch is facing forward, and the ridges are on the left and right. (See Figure 4.) BRICK LOADING FIGURE 4 BRICK INSTALLATION TIPS: Install bricks carefully to avoid damage to the insulation panels.
Step 3 Lower the insulation blankets back into position, one at a time. Carefully tuck the sides of the insulation into the edges, corners, and around the exposed portions of the heating elements to ensure maximum efficiency. AIR CHANNEL PLACEMENT FIGURE 6 Step 4 Reinstall the galvanized front panel and secure it to the system using the screws that were originally removed. Slide the bottom of this panel inside the lower lip of the brick cavity. The top rests on the outside of the cavity.
LINE VOLTAGE ELECTRICAL CONNECTIONS WARNING HAZARDOUS VOLTAGE: Risk of electric shock. Can cause injury or death. Do not energize the system until installation is complete. Equipment MUST be installed by a qualified technician in compliance with all applicable local, state, and national codes and regulations. In standard configuration, the system is wired for connection to 240V; however, the element circuits can also be connected to 208V. A 208V connection derates the charging input of the system by 25%.
Use copper or aluminum conductors rated at 75° C or higher for field connections of this device. CORE BLOWER RED WHITE OR WHITE/BLACK 5 Amp 1/4 Amp L1 COM L2 120 BLUE NO COM NO 15A L2 240 60A 60A Make connections to the primary loop pump and air These wires are located in the lower left handler pump inside this corner of the electrical compartment. junction box. The red and white wires connect to the primary loop pump and the black and white wires connect to the air handler pump.
POWER LINE CARRIER (PLC) PEAK CONTROL The Steffes Power Line Carrier (PLC) control system has the ability to communicate with the Comfort Plus Commercial Hydronic system through the existing electrical circuits in the structure. With the power line carrier option, hard wired low voltage connections from the power company's peak signaling switch connect directly to the transmitting device.
LOW VOLTAGE ELECTRICAL CONNECTIONS ROOM THERMOSTAT IMPORTANT A low voltage (24VAC) room thermostat may be used for room temperature control with the Comfort Plus Commercial Hydronic system. Steffes recommends using a digital thermostat. If utilizing a mechanical thermostat, a load resistor may be necessary due to the low current draw (.01 amps) on the heat call input circuit of the system. Contact the factory for information on thermostats available from Steffes.
TWO STAGE HEAT PUMP APPLICATION WITH VARIABLE SPEED BLOWER FIGURE 14 ) *" !! +, -# . & ./ ./ ' " 1 ! ./ ) ' " 1 ! ./ 0)/ 1.! IMPORTANT 0) .!! è & & & ( !.* & .
PRESSURE RELIEF VALVE INSTALLATION WARNING Installation Risk of explosion. Can cause injury or death. The factory supplied pressure relief valve MUST be connected to the system with the supplied fittings. w DO NOT modify this assembly. w DO NOT cap, plug, or otherwise obstruct the outlet of the pressure relief valve. w DO mount the pressure relief valve in a vertical, upright position. w This pressure relief valve is sized to service the needs of the Comfort Plus Commercial Hydronic heating system.
TYPICAL PRIMARY LOOP FIGURE 16 PRESSURE DROP THROUGH HEAT EXCHANGER STATIC PRESSURE (Feet Water Column) Piping MUST Be Air Vent Supported .1 ft @ 2 GPM .2 ft @ 4 GPM Based on 80 degree entry .4 ft @ 6 GPM water temperature with .7 ft @ 8 GPM a 50% glycol mix. 1.
IMPORTANT It is the responsibility of the installer to prevent involuntary flow of water to the air handler. Not doing so may cause limit tripping and/or decrease heat pump efficiency. Use of a check valve, zone valve, or other device may help prevent involuntary flow.
CONFIGURATION MENU The Steffes Comfort Plus Commercial Hydronic heating system has a Configuration Menu, which allows the system to be customized to the power company and consumers needs. This menu can be accessed on start-up and allows configuration settings to be easily adjusted. To access the Configuration Menu: IMPORTANT If access to the Configuration Menu times out, the 15 amp circuit breaker must be powered off and back on to re-enter the menu. Step 1 Energize the system.
C006 Output Control Configuration - Configures the output controls of the Comfort Plus Commercial Hydronic system. To determine the value, check the options desired from the list below. Then, add the numbers from the Value column and enter the sum into this location. If not used in conjunction with a heat pump or air conditioner, the value in this location should be set to two (2).
INSTALLER'S FINAL CHECK-OUT PROCEDURE WARNING HAZARDOUS VOLTAGE: Risk of electric shock. Can cause injury or death. System may be connected to more than one branch circuit. Disconnect power to all circuits before servicing. Equipment must be serviced by a qualified technician. Verify that the water pressure is correct for the application. The water pressure of the Comfort Plus Commercial Hydronic heating system should be between 12 and 20 psig.
A Appendix SPECIFICATIONS Vo ltag e C harg ing Input (k W ) E le m e nt C urre nt D raw (A m ps ) P has e N um be r o f W ire s - Se e N o te 1 C o ntro l C irc uit Vo ltag e (VA C ) - Se e N o te 2 M inim um C irc uit A m pac ity (A M P S) fo r 2 4 0 V C o ntro l C irc uit Sing le F e e d M inim um C irc uit A m pac ity (A m ps ) Se e N o te 2 P um p Vo ltag e - Se e N o te 2 Sto rag e C apac ity - Se e N o te 3 kWh B TU A ppro x im ate Ins talle d W e ig ht (lbs ) M ax C o il D im e ns io ns (W x D x H
M ode l 7140 240 277 347 208 36 36 42.75 38.4 46.5 36 46.
DISASSEMBLING THE COMFORT PLUS COMMERCIAL HYDRONIC 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 by removing the screws holding it in place. Step 3 Remove the screws around the perimeter of the limit zone and around the bottom of the left side, right side, and back upper panels.
INTERNAL SYSTEM WIRING DIAGRAMS - LINE VOLTAGE Line Voltage Wiring Diagram - Model 7120 240V OR 208V SYSTEMS ONLY Use copper or aluminum conductors rated for 75oC or higher for field connection of this device. SEE NOTE 1 CORE BLOWER COM L2 120 BLUE COM CIRCUIT #3 NO L2 240 BLOWER RED NO CHARGE 1/4 Amp CIRCUIT #2 5 Amp L1 CONTROL CIRCUIT NEUTRAL LUG BLOWERS/ CONTROLS CIRCUIT AUTO RESET BASE IO BOARD BLACK/YELLOW WHITE OR WHITE/BLACK 225 ° N.C.
Line Voltage Wiring Diagram - Model 7120 277V AND 347V SYSTEMS ONLY Use copper or aluminum conductors rated for 75oC or higher for field connection of this device. GROUND LUG CORE BLOWER BLACK EXCHANGER LIMITS 250 ° N.C. HIGH TRANSFORMERS 240v / 24v MANUAL RESET 225 ° N.C. WHITE OR WHITE/BLACK AUTO RESET TRANSFORMER PRIMARY BASE IO BOARD BLACK/YELLOW Red & White To Primary Loop Pump (Max 1.2 AMPS) Black & White To Air Handler Pump (Max 1.
Line Voltage Wiring Diagram - Model 7130 208V AND 240V SYSTEMS ONLY Use copper or aluminum conductors rated for 75oC or higher for field connection of this device. SEE NOTE 1 CORE BLOWER COM L2 120 BLUE COM BLACK 15A NO COM FAN ON RELAY ORANGE NO CIRCUIT #4 CHARGE CIRCUIT #3 NO L2 240 BLOWER RED NO CHARGE 1/4 Amp CIRCUIT #2 5 Amp L1 CONTROL CIRCUIT NEUTRAL LUG BLOWERS/ CONTROLS CIRCUIT AUTO RESET BASE IO BOARD BLACK/YELLOW WHITE OR WHITE/BLACK 225 ° N.C.
Line Voltage Wiring Diagram - Model 7130 277V AND 347V SYSTEMS ONLY Use copper or aluminum conductors rated for 75oC or higher for field connection of this device. GROUND LUG CORE BLOWER BLACK EXCHANGER LIMITS 250 ° N.C. HIGH TRANSFORMERS 240v / 24v MANUAL RESET 225 ° N.C. WHITE OR WHITE/BLACK AUTO RESET TRANSFORMER PRIMARY BASE IO BOARD BLACK/YELLOW Red & White To Primary Loop Pump (Max 1.2 AMPS) Black & White To Air Handler Pump (Max 1.
Line Voltage Wiring Diagram - Model 7140 240V OR 208V SYSTEMS ONLY Use copper or aluminum conductors rated for 75oC or higher for field connection of this device. SEE NOTE 1 CORE BLOWER COM L2 120 BLUE COM 15A BLACK NO COM FAN ON RELAY ORANGE NO CIRCUIT #4 CHARGE CIRCUIT #3 NO L2 240 BLOWER RED NO CHARGE 1/4 Amp CIRCUIT #2 5 Amp L1 CONTROL CIRCUIT NEUTRAL LUG BLOWERS/ CONTROLS CIRCUIT AUTO RESET BASE IO BOARD BLACK/YELLOW WHITE OR WHITE/BLACK 225 ° N.C.
Line Voltage Wiring Diagram - Model 7140 277V AND 347V SYSTEMS ONLY Use copper or aluminum conductors rated for 75oC or higher for field connection of this device. GROUND LUG FIELD SUPPLIED CORE BLOWER BLACK EXCHANGER LIMITS 250 ° N.C. HIGH WHITE COM. TRANSFORMERS 240v / 24v MANUAL RESET 225 ° N.C. WHITE AUTO RESET TRANSFORMER PRIMARY BASE IO BOARD BLACK/YELLOW Red & White To Primary Loop Pump (Max 1.2 AMPS) Black & White To Air Handler Pump (Max 1.
INTERNAL SYSTEM WIRING DIAGRAM - LOW VOLTAGE The outdoor temperature sensor, room thermostat, and peak control device are connected via low voltage wiring. System Low Voltage Wiring Diagram - Model 7120 The "R" and "C" positions in the low voltage terminal strip may be used as a source of 24 VAC for powering external low voltage devices (60 VA maximum). WARNING HAZARDOUS VOLTAGE: Risk of electric shock. Can cause injury or death.
System Low Voltage Wiring Diagram - Model 7120 with Variable Speed The "R" and "C" positions in the low voltage terminal strip may be used as a source of 24 VAC for powering external low voltage devices (60 VA maximum). WARNING HAZARDOUS VOLTAGE: Risk of electric shock. Can cause injury or death. All low voltage wiring must be segregated from line voltage circuits in the system.
System Low Voltage Wiring Diagram - 7130 The "R" and "C" positions in the low voltage terminal strip may be used as a source of 24 VAC for powering external low voltage devices (60 VA maximum). A M WARNING HAZARDOUS VOLTAGE: Risk of electric shock. Can cause injury or death. All low voltage wiring must be segregated from line voltage circuits in the system.
System Low Voltage Wiring Diagram - 7130 with Variable Speed WARNING The "R" and "C" positions in the low voltage terminal strip may be used as a source of 24 VAC for powering external low voltage devices (60 VA maximum). HAZARDOUS VOLTAGE: Risk of electric shock. Can cause injury or death. All low voltage wiring must be segregated from line voltage circuits in the system.
System Low Voltage Wiring Diagram - 7140 The "R" and "C" positions in the low voltage terminal strip may be used as a source of 24 VAC for powering external low voltage devices (60 VA maximum). WARNING HAZARDOUS VOLTAGE: Risk of electric shock. Can cause injury or death. All low voltage wiring must be segregated from line voltage circuits in the system.
System Low Voltage Wiring Diagram - 7140 with Variable Speed The "R" and "C" positions in the low voltage terminal strip may be used as a source of 24 VAC for powering external low voltage devices (60 VA maximum). WARNING HAZARDOUS VOLTAGE: Risk of electric shock. Can cause injury or death. All low voltage wiring must be segregated from line voltage circuits in the system.
HELP MENU The Comfort Plus Commercial Hydronic system 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 this menu by pressing either the up or the down arrow button. Display Reading Fxxx O xx tL:xx Description Firmware Version Number - Indicates the version of software installed. Outdoor Temperature - Indicates current outdoor temperature as recognized by the system.
Error Code 06 07 08 09 10 20 21 22 23 24 25 26 27 28 29 30 31 39 40 41-44 Cold Core Appendix Core Fail PLC Fail LoAd CAP Appendix n A.17 Description Outdoor sensor temperature from the transmitting device (PLC system) is out of normal operating range. Check the outdoor sensor attached to the transmitting device and the transmitter for proper operation. Main processor control board temperature sensor is out of normal operating range.
GL OSSAR Y GLOSSAR OSSARY the water so the air does not get into the closed loop system and cause damage to other components. Air Vent ~ Device used to release air from the system. The air vent is generally mounted on top of the air separator. Anticipated Peak ~ Used only by certain power companies as an alternative method of storing heat in the brick core. Indicated by an "A" on the system display.
W Warranty Registering your purchase is an essential step to ensure warranty coverage. A Warranty Registration card is included with the Owner's Manual. Simply complete, detach the bottom portion, and return the card today. Retain the top portion of the card for your files. WARRANTY STATEMENT Steffes Corporation (Steffes) warrants that the Steffes Electric Thermal Storage Heating Appliance is free from defects in materials and workmanship under normal use and service.
