RU3 Manufactured in North America OWNER'S MANUAL for Room Units EXT Series UL UL C LISTED S Series Models: 212, 312, 412, 512 & 612 U.S. Pat. #5042081 Can. Pat.
Introduction to Steffes ETS, A Division of Steffes Corporation Dear Valued Customer: Congratulations On Your New Purchase! The Steffes ETS heaters are of the highest quality storage heat systems available today. We are confident you will be pleased with the warm, comfortable heat from this system as well as the savings you should see in your electric heat bill. Electric Thermal Storage has been used in the United States for over 20 years. Today, Steffes is known as the leader in this technology.
TABLE OF CONTENTS 1. 2. GENERAL INFORMATION .................................................................................................................................................. 1 OPERATION ....................................................................................................................................................................... 1 - 3 A. B. 3. 4. SAFETY TIPS ...........................................................................................................
1. GENERAL INFORMATION Steffes ETS room heating units utilize off-peak electricity available during those times of the day or night when the power company can supply you with electricity more economically. By using this off-peak electricity for heating, the power company may offer you a special incentive such as a reduced electric rate, an off-peak heating rate, a time-of-use (TOU) rate, or monthly credits on your heating bill.
S SERIES •Space Heating Heating is accomplished both radiantly and by thermostatically controlled fans. Radiant heat is the heat given off from the warm room unit cabinet. If the radiant heat is not sufficient to satisfy the room's heat requirements, the wall mounted room thermostat will automatically cycle the unit fan(s), circulating air through the brick core and back into the room to maintain a constant temperature.
The EXT series can be configured in many ways. Due to the wide variety of setup methods and options, it may be necessary to consult with your sales representative for the operation instructions of your heating system. Several control devices can be used for core charging. Different combinations of these devices will provide for optimal unit function based upon utility needs, home characteristics, and installation requirements.
C. CONTROL DEVICES/SAFETY LIMIT DEVICES Table 2 CATEGORY Control Devices: Safety Devices: D. DEVICE NAME ACTION Charge Control Thermostat/Switches Cycles charging elements to maintain a proper core charge level. Room Temperature Thermostat Cycles unit fan(s) to maintain space temperature. Bimetallic Coil and Damper Assembly Modulates damper to maintain a preset discharge temperature. Charge Control Sequencer/Relay Stages elements "ON" to reduce load on charge control thermostat.
3. INSTALLATION A. PLACEMENT Room units can normally be placed on standard flooring systems with any type of covering, i.e., wood, carpet, linoleum; but, heater weight must be considered. If in doubt, consult a building contractor or an architect. (See Table 3 for weight and physical dimensions of unit being installed.) Room units are equipped with adjustable leveling legs or a security base.
3. Attach 1 3/4" x 1 5/8" wall support clips (31) to upper back side of unit using #8 x 1/2" sheet metal screws provided in hardware kit. Use the carriage bolts to secure the room heating unit to the wall support bracket. 4. Install field connection junction box. (If installing a 120 volt plug-in unit, skip to Electrical Connections section.) (NOTES: 1. Where possible, flush mount using a Sylvania #2002-R-C or equal. If unavoidable, surface mount using a Steel City #72151 - 1/2 + 3/4 or equal.
•Brick Loading GENERAL NOTES: A. B. Room Units and ceramic heat storage bricks (13) are packed separately. The bricks are shipped in boxes of four (white box) and boxes of five (brown box). One box of each is required per element bay or nine bricks total. Refer to Table 3 for the total number of bricks required in model being installed. All bricks for the Steffes ETS room units are identical. One side of the brick is indented to accommodate the factory installed heating elements.
6. After loading Row 3, insert a row of bricks on top with the indentation facing down. Continue with Row 4 starting with a lower brick followed by the upper brick. 7. Return the front aluminized steel (8) to position. 8. Carefully replace 1/2" blanket insulation (5) making sure all edges fit snugly. GRILL ATTACHMENT FIGURE 6 GRILL MUST ATTACH TO FRONT PANEL AS SHOWN 9. Install front panel (4) using hex head sheet metal screws at lower edge. 10. Vacuum lower portion of the unit. 11.
4. APPENDIX A. UNIT SPECIFICATIONS - TABLE 3 212 MODEL 312 412 512 612 S EXT S EXT S EXT S EXT S EXT Length - inches 22 28 30 36 38 44 46 52 54 60 Height - inches 27.5 27.5 27.5 27.5 27.5 27.5 27.5 27.5 27.5 27.5 Depth - inches 9.75 9.75 9.75 9.75 9.75 9.75 9.75 9.75 9.75 9.
B. WIRING FIELD CONNECTION WIRING TABLE 4 NOTES: MAXIMUM kW WIRE SIZE 240VAC 277VAC 208VAC #14 AWG 2.8 3.3 2.4 #12 AWG 3.8 4.4 3.3 #10 AWG 5.7 6.6 4.9 #8 AWG 7.6 8.8 6.6 #6 AWG 11.5 13.2 1. 512 and 612, S and EXT series units, are equipped with a two circuit element feed option. If dual feed is used, see unit identification label located on right side panel for proper sizing of each circuit. Charge Circuit #1 + Charge Circuit #2 = Total Wattage. 2.
TYPICAL SYSTEM WIRING DIAGRAMS Connections shown are for 230 VAC fans. See Unit Identification Label on lower right side panel of unit for proper fan and element voltages. (Refer to the Face Plate Diagrams to determine which circuit board your heater incorporates.
TYPICAL SYSTEM WIRING DIAGRAMS CONTINUED... Connections shown are for 230 VAC fans. See Unit Identification Label on lower right side panel of unit for proper fan and element voltages. (Refer to the Face Plate Diagrams to determine which circuit board your heater incorporates.) EXT Series - Automatic or Manual Charge Control (shown with multi-mode circuit board) FIGURE 11 NOTES FOR FIGURES 10 & 11: (SEE NOTE #1 AND #2) #1: Never apply any external voltage to the Blue and Blue/White Low Voltage Conductors.
UNIT WIRING DIAGRAMS - S SERIES CONTINUED. . . Connections shown are for 230 VAC fans - See Unit Identification Label on lower right side panel of unit for proper fan and element voltages. (Refer to the Face Plate Diagrams to determine which circuit board your heater incorporates.) Models: 512S - 612S FIGURE 14 UNIT WIRING DIAGRAMS - EXT SERIES Connections shown are for 230 VAC fans. See Unit Identification Label on lower right side panel of unit for proper fan and element voltages.
UNIT WIRING DIAGRAMS - EXT SERIES CONTINUED . . . Connections shown are for 230 VAC fans. See Unit Identification Label on lower right side panel of unit for proper fan and element voltages. (Refer to the Face Plate Diagrams to determine which circuit board your heater incorporates.) Models: 212EXT - 312EXT (shown with multi-mode circuit board) FIGURE 16 NOTES FOR FIGURE 16: 1. If peak switch is open, no charging can occur. 2.
UNIT WIRING DIAGRAMS - EXT SERIES CONTINUED. . . Connections shown are for 230 VAC fans. See Unit Identification Label on lower right side panel of unit for proper fan and element voltages. (Refer to the Face Plate Diagrams to determine which circuit board your heater incorporates.) Model: 412EXT (shown with two-mode circuit board) FIGURE 18 (SEE NOTE #1) (SEE NOTE #2) NOTES FOR FIGURES 18 & 19: Models: 512EXT - 612EXT (shown with two-mode circuit board) FIGURE 19 1. See Typical System Wiring Diagram.
CIRCUIT BOARD FACE PLATES - EXT SERIES (NOTE: When reading the Typical System Wiring Diagrams and Unit Wiring Diagrams, use these skematics to determine which circuit board your heater incorporates.
C. EXPLODED VIEW DIAGRAM - S SERIES FIGURE 25 (Note: Refer to the Room Unit Parts List for part descriptions and order item numbers.
D. EXPLODED VIEW DIAGRAM - EXT SERIES FIGURE 26 (Note: Refer to the Room Unit Parts List for part descriptions and order item numbers.
19 20 21 22 23 24 25 26 27 28 *29 30 31 32 " 33 34 *35 36 37 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 DWG. REF. NO.
T-Block Mounting Bracket (Aux.
F. ROOM UNIT TROUBLESHOOTING GUIDES Model: S Series Only Function: Air Delivery Problem: Fan(s) do not operate. Before starting any procedures listed below, check room thermostat and circuit breaker settings. Note: For cross reference to number coded components, see figure 7. Set wall thermostat to high stop position. FAN(S) NOW OPERATE. FAN(S) DO NOT OPERATE. Check wall thermostat for possible miscalibration Check voltage across F1 & F2 terminal block positions (24).
Model: S Series Only Function: Air Delivery Problem: Improper Air Discharge. Before starting any procedures listed below, check room thermostat and circuit breaker settings. Note: For cross reference to number coded components, see figure 7. Unit discharges improperly. FANS RUN INTERMITTENTLY DISCHARGE AIR TOO WARM DISCHARGE AIR TOO COOL Check for damper jamming and bimetallic coil assembly (39) calibration.
Model: S Series Only Function: Core Charging Problem: Unit will not charge. Before starting any procedures listed below, check room thermostat and circuit breaker settings. Note: For cross reference to number coded components, see figure 7. VOLTAGE PRESENT Check for line voltage between L1 and L2 terminal block positions (24). CHARGE CONTROL CIRCUIT UNUSED NO VOLTAGE PRESENT Troubleshoot and repair field wiring.
Model: S Series Only Function: Core Charging Problem: Improper Charging Before starting any procedures listed below, check room thermostat and circuit breaker settings. Note: For cross reference to number coded components, see figure 7. Unit charges improperly. UNIT CHARGES UNEVENLY UNIT UNDERCHARGES UNIT OVERCHARGES (With manual Charge Control.) Check unit wiring. If correct, replace charge control thermostat (45). Check unit amperage.
WARRANTY Steffes Corporation (“Steffes”) warrants that the Steffes ETS Electric Thermal Storage Heating Appliance is free from defects in materials and workmanship under normal use and service.
