P.O. Box 245 Syracuse, NY 13211 www.roth-america.com 888-266-7684 Installation, Operation & Maintenance: Field-Installed Electric Heater for RXT Series Units P/N: 2300100902 Table of Contents: Section 1: Model Nomenclature Model Nomenclature...2 Section 2: Safety Labeling and Signal Words Warnings, Cautions, and Notes...2 Guide Revision Table: Date By Page Note August 2010 KT All First Published Section 3: Introduction Introduction, Inspection, Definition, Unit Protection...3 Section 4: Installation Overview, Considerations, Installation Steps...4-6 Section 5: Electrical Data AHTR Electric Heat Electrical Data...6 Section 6: Wiring Diagrams AHTR101B / 10kW...7 AHTR151B / 15kW...8 AHTR201B / 20kW...9 Section 7: Parts Lists AHTR101B / 10kW...10 AHTR151B / 15kW...11 AHTR201B / 20kW...12
Section 1: Model Nomenclature 1 & 2: Family 3 & 4: Type 5 & 6: Capacity 7: Voltage AH TR 10 1 B 8: Revision Family: AH = Field Installed Electric Heater Type: TR = Field Installed Used on RXT Series Models Revision: B = Current Revision Voltage: 1 = 208/230V, 60Hz, 1 Phase Capacity: 10kW 15kW 20kW Rev.: 14 July 2010D Section 2: Safety Labeling and Signal Words DANGER, WARNING, CAUTION, and NOTE The signal words Danger, Warning, Caution, and Note are used to identify levels of hazard seriousness. The signal word Danger is only used on products label to signify and immediate hazard. The signal words Warning, Caution, and Note will be used on product labels and throughout this manual and other manuals that may apply to this product. NOTICE Notification of installation, operation or maintenance information which is important, but which is NOT hazard-related. CAUTION Indicates a potentially hazardous situation or an unsafe practice which, if not avoided, COULD result in minor or moderate injury or product or property damage. Signal Words in Manuals The signal word WARNING is used throughout this manual in the following manner: WARNING The signal word CAUTION is used throughout this manual in the following manner: CAUTION Signal Words on Product Labeling Signal words are used in combination with colors and/or on product labels. WARNING Indicates potentially hazardous situation which, if not avoided, COULD result in death or serious injury. DANGER Indicates an immediate hazardous situation which, if not avoided, WILL result in death or serious injury. Note: Used to highlight suggestions which will result in enhanced installation, reliability, or operation. Roth 2 AHTR Series Elec Heat IOM, August 2010
Section 3: Introduction INTRODUCTION The AHTR electric heater is designed specifically for the RXT Series Geothermal Heat Pump Unit. Engineering and quality control is built into every electric heater assembly. Good performance depends on proper application and correct installation. The information contained in this manual is intended for use by a qualified service technician familiar with safety procedures and equipped with the proper tools and test instruments. Shut OFF electric power at unit disconnect and/or service panel before beginning the following procedures. WARNING ELECTRICAL SHOCK HAZARD Failure to follow this warning could result in personal injury, property damage and/or death. Installation or repairs made by unqualified persons can result in hazards to you and others. Installation must conform with local building codes or, in the absence of local codes, with National Electrical Code ANSI/ NFPA 70-2008 or current edition. INSPECTION Upon receipt of any geothermal accessory, carefully check the shipment against the packing slip and the freight company bill of lading. Verify that all units and packages have been received. Inspect the packaging of each package and each unit for damages. Insure that the carrier makes proper notation of all damages or shortage on all bill of lading papers. Concealed damage should be reported to the freight company within 15 days. If not filed within 15 days the freight company can deny all claims. Note: Notify Roth s shipping department of all damages within 15 days. It is the responsibility of the purchaser to file all necessary claims with the freight company. UNIT PROTECTION Protect units from damage and contamination due to plastering (spraying), painting and all other foreign materials that may be used at the job site. Keep all units covered on the job site with either the original packaging or equivalent protective covering. Cap or recap unit connections and all piping until unit is installed. Precautions must be taken to avoid physical damage and contamination which may prevent proper start-up and may result in costly equipment repair. OVERVIEW This instruction covers the physical installation of the AHTR Series electric heat kits when installed with the RXT Series Geothermal Heat Pump unit. The electric heat accessories are used for applications of heat pump with electric heat. Each of the unit models are approved for use with specific electric heat accessories. The installation instructions list the possible combinations and other important electrical data and limitations. Table 1: Heater Compatibility Model Ahtr101b Ahtr151b Ahtr201b Accessory Heater Usage Description 10kW, 60Hz, 1 Phase w/circuit Breaker 15kW, 60Hz, 1 Phase w/circuit Breaker 20kW, 60Hz, 1 Phase w/circuit Breaker Note: AHTR electric heaters are not backward compatible. Used With RXT Model 024-072 036-072 048-072 Adapter and filler plates are shipped with the indoor units to be used with electric heat as needed depending on unit size and heater size. AHTR Series Elec Heat IOM, August 2010 3 Roth
Section 4: Installation INSTALLATION This instruction covers the physical installation of the AHTR Series electric heat kits when installed with the RXT Series Geothermal Heat Pump Unit. The electric heat accessories are used for applications of heat pump with electric heat. Each of the air handler unit models are approved for use with specific electric heat accessories. The installation instructions list the possible combinations and other important electrical data and limitations. 1. Shut OFF electrical power at unit disconnect switch or service panel. 2. Remove the upper front panel from unit and locate filler plate. Remove the (4) sheet metal screws from plate. (See Figure 1) Figure 1: Heater Installation Heater Support Rod Fits into Hole Rotate Circuit Breakers 180 Degrees for RH and LH DN Airflow WARNING ELECTRICAL SHOCK HAZARD Failure to follow this warning could result in personal injury or death. Before installing, modifying, or servicing system, main electrical disconnect switch must be in the off position. There may be more than one disconnect switch. Lock out and tag switch with suitable warning label. CAUTION CUT HAZARD Failure to follow this caution may result in personal injury. Sheet metal parts may have sharp edges or burrs. use care and wear protective clothing and gloves when handling parts. Representative drawing only, some models may vary in appearance. RIGHT HAND AIRFLOW AND LEFT HAND DOWNFLOW APPLICATION 3. If unit is going to be used for right hand return or left hand return downflow (airflow) the circuit breakers will have to be removed and rotated 180 degrees, so the OFF position will be DOWN when the cabinet is positioned on the right side. This is an NEC requirement. DO ONE BREAKER AT A TIME to make sure wires are reconnected properly. Loosen terminal screws on the wires. Gently pull wires back from breaker. Remove screws securing the breaker and rotate 180 degrees, then reconnect the wires to breaker. Proper torque for terminal screws is 35 inch pounds. 4. Insert the heater into the cabinet opening as shown in Figure 1, so the heater support rod goes into the hole in the back of the plenum. Exercise caution to prevent damage to heater element. 5. Secure the electric heat accessory with four screws. Roth 4 AHTR Series Elec Heat IOM, August 2010
Section 4: Installation LOW VOLTAGE WIRING 6. Connect the 6-Pin heater wiring harness to the receptacle located inside the cabinet (Top Cover). A perfect match and positive connection must be made between the plug and receptacle. The plug will interlock with receptacle when properly seated. Harness contains 24 Volts wiring. WIRING 7. Route unit power supply through knockout in top of unit and connect to line side of disconnect. Connect ground wire to ground lug. See wiring diagram label to make connections. All line voltage connections and ground connections MUST be made with copper wire. The power supply wiring MUST have overcurrent protection. This can be either fuses or circuit breakers. The maximum size for the overcurrent protection is shown in the column labeled Max. Fuse or NEC HACR Breaker (Amps) in the electrical Data Table or on the unit rating plate. Connect supply voltage wires to the Circuit Breakers on the heater or to the terminal block on the heater. NOTE: Supply voltage, amperage, fuse and disconnect switch sizes MUST conform with all technical specifications in this manual and on the unit rating plate. GROUNDING 8. Permanently ground the electric heat accessory in accordance with local codes and ordinances and in the United States with National Electrical Code ANSI/NFPA70-2008 or current edition. Use a copper conductor of the appropriate size from the electric heat accessory ground lug, to a grounding lug on the circuit breaker panel. On models with more than one circuit, a separate copper ground wire MUST be connected for each circuit. 8. Install top front door panel. 9. Mark an X in the appropriate box for the heater on the unit rating plate. WARNING ELECTRICAL SHOCK HAZARD The unit cabinet must have an uninterrupted or unbroken ground to minimize personal injury if an electrical fault should occur. The ground may consist of electrical wire or metal conduit when installed with existing electrical codes. TIME DELAY MODULE 10. The time delay module stages the heater elements for 15kW and 20kW heaters. In most cases, all of the DIP switches should be in the ON position, which will provide a 1,023 second (approximately 17 minute) delay between the first and second stage of electric heat. For example, if all of the switches are in the ON position of a 20kW heater, only 10kW will be energized when the thermostat calls for backup or emergency heat. After approximately 17 minutes of continuous demand from the thermostat, the second bank of electric heat will be energized, providing the full 20kW of heat. The DIP switches may be set in any manner that is desired. There are 10 DIP switches that are cumulative. In other words, starting with the first switch, the time delay for each additional switch that is in the ON position is added to the previous switch. The switches are labeled 1, 2, 4, 8, 16, 32, 64, 128, 256, and 512. When all of the switches are in the ON position, all of the numbers must be added to determine the time delay. In the case of all switches in the ON position, the delay is 1+2+4+8+16+32+64+128+256+512 = 1,023 seconds. If only 8 to 9 minutes is desired between stages, place all AHTR Series Elec Heat IOM, August 2010 5 Roth
Section 4: Installation but the last switch (the switch labeled 512 ) in the ON position. With 9 switches in the ON position, the time delay is 1+2+4+8+16+32+64+128+256 = 511 seconds (about 8.5 minutes). Other combinations of switches may be used, depending upon the desired time delay. AIR FLOW 11. Airflow requirements are different between models. Please refer to the unit Installation Instructions for airflow set-up information. TEMPERATURE RISE CHECK 12. Temperature rise is the difference between the supply and return air temperatures. NOTE: The temperature rise can be adjusted by changing the heating CFM. Refer to the unit s Installation Instructions for airflow information. NOTE: The maximum outlet air temperature for all models is 200 Degrees F (93.3 Degree C). Section 5: Electrical Data Heater Model AHTR101B AHTR151B AHTR201B Supply Voltage Heat kw TECHNICAL DATA (AHTR Electric Heaters only) Single Phase w/ Circuit Breaker Supply Circuit Number Heater kw Per Circuit FLA Total AMPS MCA Min Circuit Ampacity Maximum Over- Current Protective Device (AMPS.) # of Wires Supply Wire 75 C. Copper Wire Size Recommended Max Length (Ft) # of wires Ground Wire 240 10 Single 5 41.7 52.1 2 6 101 1 10 60 208 7.5 Single 3.75 36.1 45.1 2 6 115 1 10 240 Mult. 1 5 20.8 26.0 30 2 10 118 1 10 15 240 Mult. 2 10 41.7 52.1 60 2 6 101 1 10 208 Mult. 1 3.75 18.0 22.5 30 2 10 118 1 10 11.25 208 Mult. 2 7.5 36.1 45.1 60 2 6 101 1 10 240 Mult. 1 10 41.6 52.0 60 2 6 101 1 10 20 240 Mult. 2 10 41.6 52.0 60 2 6 101 1 10 208 Mult. 1 7.5 48.1 60.0 60 2 6 101 1 10 15 208 Mult. 2 7.5 48.1 60.0 60 2 6 101 1 10 Min Size Roth 6 AHTR Series Elec Heat IOM, August 2010
Section 6: Wiring Diagrams - AHTR101B / 10kW AHTR Series Elec Heat IOM, August 2010 7 Roth
Section 6: Wiring Diagrams - AHTR151B / 15kW Roth 8 AHTR Series Elec Heat IOM, August 2010
Section 6: Wiring Diagrams - AHTR201B / 20kW AHTR Series Elec Heat IOM, August 2010 9 Roth
Section 7: Parts List - AHTR101B / 10kW Roth 10 AHTR Series Elec Heat IOM, August 2010
Section 7: Parts List - AHTR151B / 15kW AHTR Series Elec Heat IOM, August 2010 11 Roth
Section 7: Parts List - AHTR201B / 20kW Roth 12 AHTR Series Elec Heat IOM, August 2010
AHTR Series Elec Heat IOM, August 2010 13 Roth
P.O. Box 245 Syracuse, NY 13211 888-266-7684 US 800-969-7684 CAN 866-462-2914 FAX www.roth-america.com info@roth-usa.com * ** *** * AHRI certification is shown as the Roth brand under the Enertech Manufacturing certification reference number **Roth Industries geothermal heat pumps are shown as a multiple listing of Enertech Manufacturing s ETL certification *** Roth geothermal heat pumps are listed as a brand under Enertech Manufacturing s Energy Star ratings