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FEATURING INDUSTRY STANDARD R-410A REFRIGERANT:
DRAH1T
WARNING
!
service personnel for proper installation, adjustment and
operation of this unit. Read these instructions thoroughly before
attempting installation or operation. Failure to follow these
instructions may result in improper installation, adjustment,
service or maintenance possibly resulting in fire, electrical
shock, property damage, personal injury or death.
INSTALLATION INSTRUCTIONS
AIR HANDLERS
ACCREDITED
92-20521-124-00
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Summary of Contents for DURASTAR DRAH1T
- Page 1 INSTALLATION INSTRUCTIONS AIR HANDLERS FEATURING INDUSTRY STANDARD R-410A REFRIGERANT: DRAH1T WARNING service personnel for proper installation, adjustment and operation of this unit. Read these instructions thoroughly before attempting installation or operation. Failure to follow these instructions may result in improper installation, adjustment,...
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Page 2: Table Of Contents
2.3 Model Number Nomenclature ..............7 2.4 Available Models ..................8 2.5 Dimensions & Weight ................... 9 2.5.1 DRAH1T Models ................2.6 Importance of Proper Indoor/Outdoor Match-Ups ........10 2.7 Importance Of Quality Installation ..............10 3.0 INSTALLATION ....................11 3.1 Tools and Refrigerant ................... - Page 3 (continued) 3.14.1 General Airflow Operating Limits ............28 3.14.2 Selecting Indoor Blower Motor Speed ..........28 3.14.2.1 DRAH1T Models (Constant Torque ECM Motor) ......28 3.14.3 Airflow Performance Data ..............29 3.14.3.1 DRAH1T (Constant Torque Motor) - 115/208/240/480V ....29 4.0 START-UP .......................
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Page 4: Safety Information
1.0 SAFETY INFORMATION WARNING (SEE SECTION 3.13: ELECTRICAL WIRING) Disconnect all power to unit WARNING before installing or servicing. More than one disconnect switch Duct leaks can create an unbalanced system and draw pollutants such as may be required to de-energize dirt, dust, fumes and odors into the home causing property damage. - Page 5 WARNING WARNING (SEE SECTION 3.7: AIR FILTER) PROPOSITION 65: This appliance Do not operate the system without filters. A portion of the dust entrained in contains fiberglass insulation. the air may temporarily lodge in the duct runs and at the supply registers. Any Respirable particles of fiberglass circulated dust particles could be heated and charred by contact with the heat- are known to the State of California...
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Page 6: General Information
NOTICE Use of this air-handler during construction is not recommended. If oper- ation during construction is absolutely required, the following temporary installation requirements must be followed: Installation must comply with all Installation Instructions in this manual including the following items: •... -
Page 7: Checking Product Received
it is important to have the proper balance between the air being supplied to each room and the air returning to the cooling and heating equipment. Proper balance and sealing of the duct system improves the efficiency of the heating and air conditioning system and improves the indoor air quality of the home by reducing the amount of airborne pollutants that enter homes from spaces where the ductwork and/or equipment is located. -
Page 8: Available Models
2.4 AVAILABLE MODELS AVAILABLE 208/240V MODELS DRAH1TA2417ASTNJA DRAH1TA3617ASTNJA DRAH1TA3621AHTNJA DRAH1TA3621AMTNJA DRAH1TA4821AMTNJA DRAH1TA4821ASTNJA DRAH1TA6021ASTNJA DRAH1TA6024ASTNJA Notes: • J Voltage (208/240V) single phase air handler is designed to be used with single or three phase 208/240V power. When connecting 3-phase power to the air handler ter- minal block, bring only two leads to the terminal block. -
Page 9: Dimensions & Weight
2.5.1 DIMENSIONS & WEIGHTS: DRAH1T MODELS FIGURE 3A NOTE: 24” CLEARANCE REQUIRED SUPPLY AIR DIMENSIONS AND WEIGHTS IN FRONT OF UNIT FOR FILTER AND COIL MAINTENANCE. HIGH VOLTAGE CONNECTION 7/8”, 1 3/32”, 1 31/32” DIA. KNOCK OUTS. FLANGES ARE PROVIDED... -
Page 10: Importance Of Proper Indoor/Outdoor Match-Ups
2.6 IMPORTANCE OF PROPER INDOOR/OUTDOOR MATCH-UPS To assure many years of reliable operation and optimum customer comfort and to assure the outdoor unit warranty remains valid, an air-handler model should be selected that is properly matched to the outdoor unit. This is especially critical for heat pump systems to assure proper refrigerant charge balance between the cooling and heating modes. -
Page 11: Installation
3.0 INSTALLATION 3.1 TOOLS & REFRIGERANT 3.1.1 TOOLS REQUIRED FOR INSTALLING AND SERVICING R-410A MODELS Manifold Sets: Ambient and Tube • Up to 800 PSIG High-Side Thermometers Crescent Wrench • Up to 250 PSIG Low-Side • 550 PSIG Low-Side Retard Allen Wrench Manifold Hoses: •... -
Page 12: Applications And Orientation
3.2 APPLICATIONS AND ORIENTATION 3.2.1 VERTICAL UPFLOW & HORIZONTAL LEFT DISCHARGE • Vertical Upflow & Horizontal Left Discharge is the factory configuration for all models (see Figure 4). • The return air plenum must be large enough to supply unit and strong enough to sup- port unit weight. - Page 13 FIGURE 5 ROTATING CIRCUIT BREAKER DRIP LOOP NOTE: When installing the unit in down or horizontal right discharge appli- cations, make sure the wires going to the blower motor form a proper drip loop to force any condensate that might form on the wires to drip off the lowest point of the wiring instead of entering the motor or motor control.
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Page 14: Installation In An Unconditioned Space
FIGURE 6 VERTICAL DOWNFLOW & HORIZONTAL RIGHT APPLICATIONS FACTORY COIL RAIL LOCATION ADDITIONAL COIL RAILS DETAIL A ENSURE THE RETAIN- ING CHANNEL IS FULLY ENGAGED WITH THE ADDITIONAL COIL RAIL. COIL RAILS FACTORY COIL RAIL LOCATION ST-A1213-02 FIGURE 7 INDOOR COIL AND DRAIN PAN DETAILS STRAPS HORIZONTAL DRIP PAN TOP AIR STOP... -
Page 15: Installation In Mobile/Manufactured Homes
• No perimeter supply flanges are provided. If a full perimeter supply duct is used, it is the responsibility of the installer to provide duct flanges as needed, to secure and seal the supply duct to prevent air leakage and the sweating that will result. •... -
Page 16: Installation In Corrosive Environments
3.2.5 INSTALLATION IN CORROSIVE ENVIRONMENTS The metal parts of this unit may be subject to rust or deterioration if exposed to a cor- rosive environment which can shorten its life. In addition to exposure to the exterior of the cabinet, chemical contaminants inside the building that can be drawn into the unit from the return air grille and attack structural metal parts, electrical components and the indoor coil, causing premature failure of the unit. -
Page 17: Duct Flanges
• Vertical downflow applications require clearance on at least one side of the unit for electrical connections. Refrigerant and condensate drain connections are made on the front of the unit. • All units require 24 inches minimum access to the front of the unit for service. •... -
Page 18: Return Air Filter
3.7 RETURN AIR FILTER An internal filter rack is not provided with this air-handler. Therefore, an external means of filtering the return air is required. External filters should be sized for a maximum of 300 feet/min air velocity or the maximum velocity recommended by the type of filter installed. -
Page 19: Brazing
3.9.3 BRAZING Air inside the tubing and coil should be displaced with dry nitrogen prior to the brazing process to prevent the formation of harmful copper oxide inside the tubing. It is very important not to pressurize the system with nitrogen while brazing or pin-hole leaks will form in the braze joint. -
Page 20: Condensate Drain
FIGURE 11 BULB LOCATION 10 O’CLOCK 2 O’CLOCK BULB BULB VAPOR LINE FIGURE 12 TXV BULB & FOAM GASKET LOCATION FOAM GASKET TXV BULB ST-A1278-01 3.11 CONDENSATE DRAIN Consult local codes or ordinances for specific requirements. IMPORTANT: When making drain fitting connections to the drain pan, use a thin layer of Teflon paste, silicone or Teflon tape and install hand tight. -
Page 21: Thermostat
FIGURE 13 CONDENSATE DRAIN TRAP ST-A1244-01-01 • Do not reduce drain line size less than connection size provided on condensate drain pan. • All drain lines must be pitched downward away from the unit a minimum of 1/8” per foot of line to ensure proper drainage. •... -
Page 22: Configuring Unit For 208 Volt Power
NOTE: WIRE BASED ON COPPER CONDUCTORS 75°C MINIMUM RATING. FOR MORE THAN 3 CONDUCTORS IN A RACEWAY OR CABLE, SEE N.E.C. FOR DERATING THE AMPACITY OF EACH CONDUCTOR. 3.13.5.1 ELECTRICAL DATA – BLOWER MOTOR ONLY – WITHOUT ELECTRIC HEAT: DRAH1T MINIMUM MAXIMUM... -
Page 23: Electrical Data - With Electric Heat
3.13.6.1 ELECTRICAL DATA – WITH ELECTRIC HEAT DRAH1T Installation of the UL Listed original equipment manufacturer provided heater kits listed in the following table is recommended for all auxiliary heating requirements. HEATER TYPE SUPPLY AIR HANDLER HEATER MINIMUM MAXIMUM CIRCUIT... - Page 24 3.13.6.1 ELECTRICAL DATA – WITH ELECTRIC HEAT: DRAH1T - continued HEATER TYPE SUPPLY AIR HANDLER HEATER MINIMUM MAXIMUM CIRCUIT HEATER MOTOR MODEL MODEL PH/HZ ELEMENTS CIRCUIT OVERCURRENT (208/240V) SINGLE CIRCUIT AMPS AMPS DRAH1T - KW PER AMPACITY PROTECTION (480V)➀ MULTIPLE CIRCUIT RXBH-1724?05J 3.6/4.8...
- Page 25 3.13.6.1 ELECTRICAL DATA – WITH ELECTRIC HEAT: DRAH1T - continued HEATER TYPE SUPPLY AIR HANDLER HEATER MINIMUM MAXIMUM CIRCUIT HEATER MOTOR MODEL MODEL PH/HZ ELEMENTS CIRCUIT OVERCURRENT (208/240V) SINGLE CIRCUIT AMPS AMPS DRAH1T - KW PER AMPACITY PROTECTION (480V)➀ MULTIPLE CIRCUIT 7.2/9.6...
- Page 26 3.13.7 ELECTRIC HEATER KIT SUPPLEMENTAL INFORMATION AIR CONDITIONING DIVISION Contractor (-)HLA-HM4821JA should “mark or check” the MARK HEATER I N STALLED/ L’APPAREI L DE CHAUFFAGE DE MARQUE A I N STALLE left column for the kit installed. If a heater kit is list- ed both These are...
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Page 27: Electric Heater Kit Supplemental Information
GL - BLUE O - ORANGE R - RED FIGURE 14: DRAH1T FIGURE 15: DRAH1T TYPICAL THERMOSTAT: SINGLE STAGE COOLING W / ELECTRIC HEAT TYPICAL THERMOSTAT: SINGLE STAGE HEAT PUMP W / ELECTRIC HEAT **For 13kW or higher, W1 and W2 can be connected together for maxi- mum outlet temperature rise. -
Page 28: General Airflow Operating Limits
Each DRAH1T model can be matched with 2 different outdoor unit capacities, 1.5 - 2.0 tons, 2.5 - 3.0 tons, 3.5 - 4.0 tons, & 4.0 - 5.0 tons depending on the model. DRAH1T models have constant torque ECM motors with 5 blower motor speed taps, labeled T1 through T5. -
Page 29: Airflow Performance Data
3.14.3.1 115/208/240/480V AIRFLOW PERFORMANCE DATA: DRAH1T (CONSTANT TORQUE MOTOR) CFM[L/s] Air Delivery/RPM/Watts (Dry Coil – No Filter) Motor Blower Size/ Model Tonnage Speed Motor External Static Pressure-Inches W.C. Number Motor H.P. Application From Speed DRAH1T # of Speeds Factory 0.10 [.02] 0.20 [.05]... - Page 30 3.14.3.1 115/208/240/480V AIRFLOW PERFORMANCE DATA: DRAH1T (CONSTANT TORQUE MOTOR) - continued CFM[L/s] Air Delivery/RPM/Watts (Dry Coil – No Filter) Motor Blower Size/ Model Tonnage Motor Speed External Static Pressure-Inches W.C. Number Motor H.P. Application Speed From DRAH1T # of Speeds Factory 0.10 [.02]...
- Page 31 3.14.3.1 115/208/240/480V AIRFLOW PERFORMANCE DATA: DRAH1T (CONSTANT TORQUE MOTOR) - continued CFM[L/s] Air Delivery/RPM/Watts (Dry Coil – No Filter) Motor Model Blower Size/ Tonnage Motor Speed External Static Pressure-Inches W.C. Motor H.P. Number Application Speed From DRAH1T # of Speeds Factory 0.10 [.02]...
- Page 32 3.14.3.1 115/208/240/480V AIRFLOW PERFORMANCE DATA: DRAH1T (CONSTANT TORQUE MOTOR) - continued CFM wet Delivery/ lter/heaters/RPM/Watts (Dry Coil – No Filter) Nominal Motor Model Blower Size/ External Static Pressure-Inches W.C. Cooling Motor Speed Motor H.P. Number Capacity Speed From DRAH1T # of Speeds...
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Page 33: Start-Up
For DRAH1T air-handlers, the Y terminal on the blower control board is also energized which tells the blower control board to energize the cooling speed on the motor instead of the reduced CFM continuous fan speed. -
Page 34: Electrical Heat Mode
30 seconds to extract the residual heat from the warm indoor coil. If the thermostat is set for continuous fan operation, the motor continues to operate when the call for heating ends. The air-flow on an DRAH1T air-handler will be reduced to the continuous fan speed . -
Page 35: Correcting Electric Heat Kw For Voltage
4.4 CORRECTING ELECTRIC HEAT kW FOR VOLTAGE The actual electric heat kW varies with the supply voltage. Use the following formula to correct the heater rated kW at voltages other than rated voltage. Actual kW = Rated kW × (Actual Voltage / Rated Voltage 4.5 CALCULATING ELECTRIC HEAT CAPACITY IN BTUH Use the following formula to convert heater kW to heating capacity in BTUH. -
Page 36: Checking Refrigerant Charge
5.0 COMPONENTS & C0NTROLS 5.1 BLOWER MOTOR All DRAH1T models have 5-speed constant torque electronically commutated (ECM) style motors that are significantly more efficient than PSC motors. • The 208/240 volt models do not require the motor to be reconfigured for 208 volt applications, although the control transformer must still be reconfigured for 208 volt applications. -
Page 37: Blower Control
• Most models have 3 coil slabs in an “N” configuration, but some models have 2 coil slabs in an “A” configuration. • DRAH1T air-handlers can have either a non-bleed TXV with internal check-valve or a fixed orifice (piston), making the air-handler suitable for AHRI certified heat pump applications in addition to straight cooling applications. -
Page 38: Accessories & Kits
6.0 ACCESSORIES & KITS 6.1 ELECTRIC RESISTANCE HEATER KITS • All DRAH1T models are shipped without electric resistance heat. • Electric heat kits ranging from 3kW to 30kW are available for field installation. • Refer to Sections 3.13.5, 3.13.6, & 3.13.7 for electric heat kit model numbers avail- able for specific air-handler models along with electrical ratings &... -
Page 39: Combustible Floor Bases
FIGURE 16 EXTERNAL FILTER BASE: RXHF- 6.5 COMBUSTIBLE FLOOR BASES For high heat downflow applications. (See Section 3.2.2.) Combustible Floor Model Cabinet Size Base Model Number RXHB-17 RXHB-21 RXHB-24 6.6 HORIZONTAL ADAPTER KITS This horizontal adapter kit is used to convert RCH replacement coils for horizontal appli- cations if water management parts from original coil are not usable or are unavailable. -
Page 40: Indoor Coil, Drain Pan, Drain Line
IMPORTANT: Do not operate the system without a filter in place. • New filters are available from a local distributor or home supply retailer. 7.2 INDOOR COIL, DRAIN PAN, DRAIN LINE Inspect the indoor coil, drain pan, and drain line once each year for cleanliness and clean as necessary. -
Page 41: Motor Replacement
With the blower assembly removed, the indoor blower motor can be removed and replaced using the following procedure: • Remove motor leads from the motor capacitor and motor terminals for DRAH1T. Note lead locations for ease of reassembly. Pull leads from plastic bushing in blower side. -
Page 42: Diagnostics
8.0 DIAGNOSTICS... -
Page 43: Wiring Diagrams
9.0 WIRING DIAGRAMS 9.1 WIRING DIAGRAM DRAH1T – 208/240V... - Page 44 CM 0720...
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