HeatChoice II ™ Electric Plenum Heater Installation & Operating Instructions (EH-***-*) Model Series · · · · · · Application Dual Heat – combine this electric plenum heater with stand-by gas or oil furnace. With or without standard air conditioning. Standard furnace blower or variable speed blower. Not compatible with heat pumps. Furnace fan center or wiring board equivalent required. Multi-zone compatible.
Table of Contents Introduction 1 Specifications and Product Dimensions 2 Installation Requirements 3 Mechanical Installation Overview 4 Upflow 6 Downflow 8 Horizontal 8 Electrical Installation Overview Electrical Installation 10 Oil Furnace with “T and T” Control 12 Power On, Start Up 13 Operational Tips 13 Stat Override Timer (SOT) Additional Applications or Special Equipment Concerns Wood Furnace 14 16 16 Troubleshooting 18 Replacement Parts List 19 Drawings 04/03/2009 9 EH1
Product Configurator EH-*** - * U = Upflow D = Downflow kW 10 = 10 kW 15 = 15 kW 20 = 20 kW 25 = 25 kW Width 8 = 18” 5 = 15” Introduction The Power of Choice is encouraging many homeowners to build versatility and flexibility into their heating system. When used and controlled properly, electric heat can save hundreds of dollars per year. To meet this Power of Choice need, this HeatChoice series plenum heater is very versatile with a variety of applications.
Specification Table Model Number: kW Rating Voltage/Phase Control Voltage Circuit Breaker Source Feed Elements Min. CFM Max. Temp. Rise Shipping Weight EH-*10-+ EH-*15-+ EH-*20-+ EH-*25-+ 10 240/1 24 volts 1-60 1 4 650 50° F 34# 15 240/1 24 volts 1-60, 1-30 2 6 900 50° F 36# 20 240/1 24 volts 2-60 2 8 1200 50° F 38# 25 240/1 24 volts 2-60, 1-30 3 10 1500 50° F 42# Loaded or electric call for heat operating voltage must be between 23 and 28 volts, 60Hz.
Installation Requirements 1. All installation work must be performed by trained, qualified contractors or technicians. Electro Industries, Inc., sponsors installation and service schools to assist the installer. Visit our web site at electromn.com for upcoming service schools. WARNING ALL ELECTRICAL WIRING MUST BE IN ACCORDANCE WITH NATIONAL ELECTRIC CODE AND LOCAL ELECTRIC CODES, ORDINANCES, AND REGULATIONS. WARNING OBSERVE ELECTRIC POLARITY AND WIRING COLORS.
Mechanical Installation Overview This HeatChoice unit cannot produce airflow and cannot correct airflow problems inherent within the existing furnace system. The following eight items should be carefully considered and properly followed for all installations: Examination of the existing forced air furnace – prior to starting this installation or furnace modification, examine the total furnace system and make necessary comments or recommendations to the homeowner.
Other plenum equipment – auxiliary equipment such as humidifiers, zone plenum dampers, etc., located within the plenum which may cause a non-uniform airflow will have to be removed. Zone dampers within the trunk line at least 12" from the HeatChoice typically are no problem. When horizontal zone dampers are involved, perform all check-out functions with smallest zone open first. Comment – zone dampers cause back pressure on the blower and overall reduced airflow.
Mechanical Installation Upflow Using (figure 1) and visualizing the HeatChoice installation, work through the following eight steps: Step 1 Observe and select the insert location in the furnace plenum. a. Above A-coil b. HeatChoice II hole cutout at A-coil end (facing side) c. Depending upon the specific model, between 8” and 9.5” of space is required above the top of the A-coil. This space is where the HeatChoice II is physically inserted into the plenum. d.
Step 3 Cut insert hole using provided template, (figure 3). Figure 3 Step 4 Add necessary baffling. a. See Step 2 for determination and if required. The HeatChoice is designed with a special double plate at the element mounting. Cool air from the blower must blow between these two plates. Therefore, the Elector-Mate must be inserted into the base plenum such that the mounting plate is even with the edge of the hot air outlet hole.
Mechanical Installation Downflow For downflow installations, model numbers (EH-D**-*) must be used. Upflow models (EH-U**-*) cannot be used in this application. The basic mechanical installation instructions represented above in the upflow mechanical installation section apply to this section as well. Reference drawing EA111 located in the back of this guide for correct placement of the HeatChoice unit in downflow applications.
Electrical Installation Overview WARNING TO AVOID THE RISK OF ELECTRIC SHOCK OR DEATH, WIRING TO THE UNIT MUST BE PROPERLY GROUNDED. FAILURE TO PROPERLY GROUND THE UNIT CAN RESULT IN A HAZARD LEADING TO PERSONAL INJURY OR DEATH. Line Voltage The nameplate and/or Installation and Operating Manual specification page provides kW rating and operating current requirements for each specific model. Select the proper wire size to comply with your type of wire routing and NEC field wiring requirements.
XD jumper – located on the mid right hand side of the HeatChoice control board is a jumper marked XD. When open, a 2-minute delay stage-up between each stage 2, stage 4, and stage 5 is added to the staging sequence. The intentions for this option is to bring the heat on slowly to reduce the possibilities of initial overheat and perhaps lessen high limit. The default factory setting for the XD jumper is closed.
Step 3 Room thermostat – use only basic 4-wire, heat/cool type. Route the standard R, W, G, Y roomstat screw functions to the HeatChoice DECII control board top tab/screw terminal adapters. Use wire to wire same letter connection. (figure 5) Figure 5 Step 4 Air conditioning, outdoor unit – this should be a 2-wire hookup, typically represents the contactor coil. Connect one wire to the top “YL” terminal and the second to a bottom “C” terminal.
Utility load control – extend the two blue wires to an appropriate set of wires or contact closure within the power company control receiver. For electric energy operation (offpeak) the two blue wires represent a contact closure as shipped. Do not apply external voltage or external power to the blue wires, they are simply looking for a closed contact during off-peak. (figure 8) - Optional – where load management interrupt does not apply simply leave the two blue wires tied together and wire nutted.
Power On, Startup 1. Use the airflow verification procedure within the attached warranty certification form. If you experience hilimit cycling or plenum temperatures greater than specified, this must be corrected before leaving the site. Correction can include verification of proper placement within the plenum, plenum deflectors/baffles (previous diagrams), increasing overall furnace airflow capacity, enlarging furnace blower, or disconnecting lower elements to reduce the heating capacity.
4. DECII module indicators (figure 11) Front panel top red LED (Hi-limit) – illuminates when high limit switch is open. Front panel green LED (Control Power) – indicates 24-volt source from furnace and non-blown fuse. Front panel red/green LED (Heat Source) – indicates which heat source is being used, red = gas, green = electric, flashing red/green = utility load control. Front panel bottom red LED (Heat Call) – Indicates room thermostat call for heat.
10. System temperature response – the overall temperature rise (both sides of HeatChoice) must be within the maximum specification, see "Specification Chart". If any portion of the plenum (above elements) is operating with an air temperature greater than 125°F, element life will be shortened. - CFM CALCULATIONS, THIS HEATCHOICE - By measuring the temperature rise across the HeatChoice, the actual CFM can be quite accurately determined.
Additional Applications Furnace variable speed blower – (Figure 12) a fifth wire connection will be needed to speed up the gas furnace blower for air conditioning and HeatChoice electric heating operation. Add the fifth wire to the gas furnace “Y” terminal as shown on the diagram. Note: Connection wires shown are in addition to 4-wire thermostat and 4 wires to furnace.
Reduced HeatChoice output – (figure 14) the white/ blue jumper wire located on the upper right hand side of the control board (W1, W2) is designed to drop half of the HeatChoice heating elements when opened. When the jumper is opened stages 2, 4, and 5 are dropped, when applicable. Application: This option can be useful for multiple zones, load shed, outdoor thermostat, or any other external contact closure when needed to cut the output in half.
Operational Conditions Which May Prevent Electric Mode Stages On 1. No call for heat – Heat Call LED is off 2. In Stand-By mode, see previous section 3. Hang-up – power down, 10 seconds, power up Conditions Which May Prevent Electric Elements On 1. Mechanical Hi-Limit, front panel top LED on 2. Board K1 or K2 open/inoperative 3. Inoperative element relays 4. HeatChoice circuit breakers off 5. Burnt 240 inside wires 6.
19” width or 20” depth
PLENUM HEATER MODEL: EH-U25-8 W1 L2 L1 Y YL W2 BL 120 L2 DUAL HL7 R R 170°F BK BK HL RW Y BL 5DEL X1 J3 250°F 120°F II PC1 HL6 HL8 ENERGY CONTROL RW BK L1 G R L2 J1 L1 WHT/BLU STAT J1 W HEATCHOICE 4DEL COM CB1 CB2 CB3 BK 60A 60A 30A BK EL 2DEL SB J3 CB3 L2 CB2 L2 CB2 L1 CB1 L2 CB1 L1 1DEL LED3 C C W G R R BL BLW BK R BK K10 K9 K10 YG R R BK R R CB1 BK E4 BK L2 BK HL4 BK E6 BK BK 118°F E8 BK BK L2 R K9 L2 CB1 VI
HEATCHOICE PLENUM HEATER MODEL: EH-(D,U)20-(5,8) WHT/BLU STAT W1 DETAIL L2 A EH-D**-* HL8 SEE ONLY HL6 R R RW R R 170°F BK RW BK 250°F CB2 60A 60A II PC1 BK HL RW X1 J3 250°F Y BL 5DEL 4DEL 120°F CB1 YL ENERGY CONTROL HL6 BK Y DUAL RW R 170°F HL5 HL7 BL 120 A HL7 R 170°F DETAIL EH-D**-* FOR W2 BK L1 G R L2 J1 L1 W J1 COM BK EL 2DEL BK SB J3 1DEL LED3 CB2 L1 CB1 L1 BL BLUE E BLW ELEMENT HL HI-LIMIT K RELAY PC CIRCUIT BOARD T T
HEATCHOICE PLENUM HEATER EH-(D,U)15-(5,8) WHT/BLU STAT W1 L1 DETAIL L2 A EH-D**-* HL8 SEE DETAIL ONLY FOR HL6 R R RW R R BK RW BK 250°F CB2 60A 30A II PC1 BK HL RW X1 J3 250°F Y BL 5DEL 4DEL 120°F CB1 YL ENERGY CONTROL RW HL6 BK Y DUAL 170°F HL5 HL7 R 170°F W2 BL 120 A EH-D**-* HL7 R 170°F G R L2 J1 L1 W J1 BK MODEL: COM BK EL 2DEL BK SB J3 1DEL LED3 BK BK WIRE CB CIRCUIT BREAKER BL BLUE E BLW HL HI-LIMIT K RELAY PC CIRCUIT B
HEATCHOICE PLENUM HEATER MODEL: EH-E(D,U)10-(5,8) WHT/BLU STAT W1 HL8 SEE ONLY FOR HL6 R R RW R R 170°F R BK RW BK 250°F Y CONTROL II RW PC1 HL6 BK YL DUAL ENERGY 170°F HL5 HL7 BL 120 A EH-D**-* HL7 R 170°F DETAIL W2 BK A EH-D**-* G R DETAIL L2 J1 L1 W J1 BK HL RW X1 J3 250°F Y BL 5DEL 4DEL 120°F COM BK CB1 EL 2DEL BK 60A SB J3 1DEL LED3 C W C COM 1WS G R R BL BLW 24 VAC J2 L2 CB1 WBL E3 BK BK COMPONENT CODE WIRE CB CIR
Electro Industries, Inc. Limited Product Warranty Effective February 5, 2009 Electro Industries, Inc. warrants to the original owner, at the original installation site, for a period of two (2) years from date of installation, that the product and product parts manufactured by Electro Industries are free from manufacturing defects in materials and workmanship, when used under normal conditions and when such product has not been modified or changed in any manner after leaving the plant of Electro Industries.
THESE WARRANTIES DO NOT COVER: 1. Costs for labor for removal and reinstallation of an alleged defective product or product parts, transportation to Electro Industries, and any other materials necessary to perform the exchange, except as stated in this warranty. Replacement material will be invoiced to the distributor in the usual manner and will be subject to adjustment upon verification of defect. 2.
