Rutru A4AH4P Convertible Air Handlers User Manual
SAFETY SECTION AIR HANDLERS
Important:
This document contains a wiring diagram, a parts list, and service information. This is customer property and is to remain with this unit. Please return to the service information pack upon completion of work. These instructions do not cover all variations in systems nor provide for every possible contingency to be met in connection with the installation. Should further information be desired or should particular problems arise that are not covered sufficiently for the purchaser’s purposes, the matter should be referred to your installing dealer or local distributor.
CAUTION
GROUNDING REQUIRED! Failure to inspect or use proper service tools may result in equipment damage or personal injury. Reconnect all grounding devices. All parts of this product that are capable of conducting electrical current are grounded. If grounding wires, screws, straps, clips, nuts, or washers used to complete a path to ground are removed for service, they must be returned to their original position and properly fastened.
WARNING LIVE ELECTRICAL COMPONENTS!
Failure to follow this warning could result in property damage, severe personal injury, or death. Follow all electrical safety precautions when exposed to live electrical components. It may be necessary to work with live electrical components during installation, testing, servicing, and troubleshooting of this product.
PRESSURIZED REFRIGERANT!
Failure to follow this warning could result in personal injury System contains oil and refrigerant under high pressure. Recover refrigerant to relieve pressure before opening the system. Do not use nonapproved refrigerants refrigerant substitutes or refrigerant additives.
HAZARDOUS VAPORS!
Failure to follow this caution could result in property damage or personal injury. Equipment corrosion damage. To prevent shortening its service life, the air handler should not be used during the finishing phases of construction or remodeling. The low return air temperatures can lead to the formation of condensate. Condensate in the presence of chlorides and fluorides from paint, varnish, stains, adhesives, cleaning compounds, and cement creates a corrosive condition that may cause rapid deterioration of the cabinet and internal components.
Note:
Air handlers have been evaluated per the Code of Federal Regulations, Chapter XX, Part 3280 or the equivalent. “SUITABLE FOR MOBILE HOME USE.” Condensation may occur on the surface of the air handler when installed in an unconditioned space. When units are installed in unconditioned spaces, verify that all electrical and refrigerant line penetrations on the air handler are sealed completely. The manufacturer recommends installing ONLY A.H.R.I-approved, matched indoor and outdoor systems. Some of the benefits of installing approved matched indoor and outdoor split systems are maximum efficiency, optimum performance, and the best overall system reliability.
Features
Standard Features
- MULTI-POSITION UPFLOW, DOWNFLOW, HORIZONTAL LEFT AND HORIZONTAL RIGHT
- GALVANIZED STEEL EXTERIOR WITH FULLY INSULATED
- CABINET THAT MEETS R4.2 VALUE
- STURDY POLYCARBONATE DRAIN PANS
- The A4AH4 air handler has factory installed drain pans and is shipped for upflow and horizontal left applications 208/230 VAC OPERATION
- MULTI-SPEED DIRECT DRIVE BLOWER.
- FACTORY INSTALLED NOMINAL SIZED ORIFICE PISTON (1.5
- 2.5 TON MODELS
- FACTORY INSTALLED R-410A THERMAL EXPANSION VALVE (3 -5 TON MODELS)
- ALL ALUMINUM COIL OTTOM RETURN
- MEETS THE MINIMUM LEAKAGE REQUIREMENTS FOR THE
- FLORIDA AND CALIFORNIA BUILDING CODES
Optional Accessories
- 4,5,8,10,15, 20 and 25 KW SINGLE PHASE ELECTRIC HEATERS
- Circuit breakers available on all single phase 4, 5, 8, 10 15, 20, and 25 KW heaters
- Lug terminals available on all single phase 4, 5, 8, and 10 KW heaters
- 10 and 15 KW THREE-PHASE ELECTRIC HEATERS
- Heaters available with lug terminals
- SINGLE POINT POWER ENTRY KIT (for 15 and 20 KW Heaters)
- SUPPLY DUCT FLANGE KITI
- DOWNFLOW WATER MANAGEMENT KIT – BAYTEMDFKT1A (required for 5 Ton models) R-22 CONVERSION KITS – BAYATV1836B, BAYATXV4248B, BAYATXV6161B
- SLIM FIT FILTER BOX KIT – BAYSF1185AAA, BAYSF1235AAA
- R-410A THERMAL EXPANSION VALVE KIT (1.5 – 2.5 MODELS) BAY4TXV1830A
Installation Instructions
Unpacking
Carefully unpack the unit and inspect the contents for damage. If any damage is found at the time of delivery, proper notification and claims should be made with the carrier. Check the rating plate to ensure the model number and voltage, plus any kits match what you ordered. The manufacturer should be notified within 5 days of any discrepancy or parts shortage.
Location
The air handler should be centrally located and may be installed in a closet, alcove, utility room, basement, crawl space, or attic. Minimum clearances must be met.
Important:
The downflow sub-base may be required with electric heat applications.
The unit should be installed in a level position to ensure proper condensation drainage. Up to an additional 1/4” rise over the width or depth of the unit is allowed to create additional sloping towards the drain. The Unit must be positioned between level and ¼” rise, sloping toward the drain connections. When the unit is installed in a closet or utility room, the room should be large enough, and have an opening to allow replacement of the unit.
All servicing is done from the front and a clearance of 21″ is needed for service unless the closet door aligns with the front of the air handler. If you are installing the unit in an unconditioned space such as an attic or crawl space, you must ensure that the area provides sufficient air circulation to prevent moisture collection on the cabinet during high dew point conditions. A drain pan must be installed under the entire unit when it is installed in or above a finished ceiling or in an unconditioned space.
Duct Work
The duct work should be installed per NFPA No. 90A “Installation of Air Conditioning and Ventilating Systems” and No. 90B “Residential Type Warm Air Heating and Air Conditioning Installation.” The ductwork should be insulated under the applicable requirements for the particular installation as required by HUD, FHA, VA the applicable building code, local utility, or other governing body.
Condensate Drain
The unit is supplied with primary and auxiliary condensate drains that have 3/4″ NPT connections. The primary drain must be trapped outside the unit and piped by applicable building codes. The figure shows the operation of a properly designed trap under normal operating conditions when the blower is running and the condensate is draining.
Note the difference in height of the water column must at least equal the normal negative static pressure existing during operation between the cooling coil and blower. It is advisable to have the difference in water column height somewhat greater than the normal maximum operating static to allow for greater static caused by dirty filters or for the bounce of the water column on start-up.
Proper operation of condensate trap under normal operating conditions. “A” height of the water column equals negative static pressure existing in the system. The “C” dimension should at least equal two times the maximum negative static pressure that can occur in the system. Do not reduce the drain line size to less than the connection size on the drain pan. Condensate should be piped to an open drain or the outside. All drains must pitch downward away from the unit a minimum of 1/4″ per foot of line to ensure proper drainage.
Important:
If a cleanout Tee is used, the standpipe must be sealed/capped.
Insulate the primary drain line to prevent sweating where dew point temperatures may be met. (Insulation is optional depending on climate and application needs.)
Refrigerant Piping
Refrigerant piping external to the unit shall be sized per the instructions of the manufacturer of the outdoor equipment.
Metering Device
3 through 5-ton units are shipped and installed with an internally checked, bleed TXV designed for air conditioning or heat pump operation. Charge systems with indoor TXV using the subcooling method as recommended in the outdoor unit Installer’s Guide. Pressures equalize after shut down. Some outdoor models may require a start assist kit. See the outdoor unit for more information. 1.5 through 2.5-ton units are shipped and installed with an orifice piston sized for nominal tonnage. Charge systems with indoor fixed orifice pistons by the superheat method using the superheat charging table.
Blower
This unit is supplied with a multi-speed motor with a direct drive blower wheel which can obtain various air flows. The unit is shipped with factory-set cooling and heating speed taps. Airflow performance tables are available for additional speed taps. Disconnect all power to the unit before making any adjustments to the motor speed taps. Be sure to check the airflow and the temperature drop across the evaporator coil to ensure sufficient airflow.
Wiring
Consult all schematic and pictorial wiring diagrams of this unit and the outdoor equipment to determine the compatibility of wiring connections and to determine specific requirements. All field wiring to the air handler should be installed by the latest edition of the National Electric Code NFPA No. 70 and any local codes. Check rating plates on the unit for rated volts, minimum circuit ampacity, and maximum over-current protection. Supply circuit power wiring must be 75 degrees C (167 degrees F) minimum copper conductors only.
Copper supply wires shall be sized to the National Electric Code or local code requirements, whichever is more stringent. The unit is shipped wired for 230/240 Volt AC 60 HZ 1 Phase Operation. If the unit is to be operated at 208 VAC 60HZ, follow the instructions on the indoor unit wiring diagram to change the low voltage transformer to 208 VAC operation (Ensure the unit is properly grounded).
Class 2 low voltage control wiring should not be run in conduit with power wiring and must be separated from power wiring unless class 1 wire with proper voltage rating is used. Low voltage control wiring should be 18 Awg, color coded (105 degree C minimum). For lengths longer than 100ft., 16 Awg wire should be used. Make certain that separation of control wiring and power wiring has been maintained.
Air Filter
To protect the coil, blower and other internal parts from excessive dirt and dust an air filter must be installed before air enters the evaporator coil. A remote filter must be installed. Consult the filter manufacturer for proper sizing and maximum velocity requirements.
Thermostat
Select a thermostat that is commonly used with HP or AC single-stage heating/cooling with electric heat. The thermostat will energize the fan on demand for heat or cool. Install the thermostat on an inside wall, away from drafts, lights or other heat sources in a location that has sufficient air circulation from other rooms being controlled by the thermostat.
Sequence of Operation Cooling (Cooling only)
PSC versions – When the thermostat calls for cooling, the circuit from R to G is completed. The blower relay is energized. Constant torque version – When the thermostat calls for cooling, the circuit from R to G is completed. The blower motor is energized directly by the 24VAC signal from the thermostat. The circuit from R to Y is also completely energizing the compressor contactor of the outdoor unit. The contractor will close and start the compressor and condenser fan motor
Cooling (heat pump)
PSC versions – When the thermostat calls for cooling, the circuit from R to G is completed. The blower relay is energized. Constant torque version – When the thermostat calls for cooling, the circuit from R to G is completed. The blower motor is energized directly by the 24VAC signal from the thermostat. The circuit from R to Y is also completely energizing the compressor contactor of the outdoor unit. The contractor will close and start the compressor and condenser fan motor. Circuit R to O energizes the reversing valve to the cooling position.
Heating (heat pump)
PSC versions – When the thermostat calls for heating, the circuit from R to G is completed. The blower relay is energized. Constant torque version – When the thermostat calls for heating, the circuit from R to G is completed and the blower motor is energized directly by the 24VAC signal from the thermostat. The circuit from R to Y is also completely energizing the compressor contactor of the outdoor unit. The contractor will close and start the compressor and condenser fan motor. In the heating mode, the reversing valve of the outdoor unit is not energized. If the indoor temperature continues to fall, the R to W circuit is completed energizing the electric heat contactor(s).
Heating (electric heat only)
Note: The thermostat must be set up to bring the blower on when the electric heat is energized.
PSC versions
When the thermostat calls for heating, the circuit from R to G is completed. The blower relay is energized. The circuit from R to W is completed energizing the heating contactor(s). Constant torque version – When the thermostat calls for heating, the circuit from R to G is completed and the blower motor is energized directly by the 24VAC signal from the thermostat. The circuit from R to W is completed energizing the heating contactor(s).
Defrost
Supplemental heat during defrost can be provided by connecting the X2 (black) wire from the outdoor unit to W1 or W2 at the indoor unit. This will prevent cold air from being discharged from the indoor unit during defrosting.
Maintenance
The system air filter(s) should be inspected, cleaned or replaced at least monthly. Make certain that the access panels are replaced and secured properly before placing the unit back in operation. This product is designed for dependable service; however, periodic maintenance should be scheduled and conducted by trained professional service personnel. This service should be conducted at least annually and should include testing and inspection of electrical and refrigerant components. The heat transfer surface should be cleaned. The blower motor is permanently lubricated for normal operating conditions.
Field Wiring
HEAT PUMP SYSTEMS
AC SYSTEMS
In AC systems for multiple stages of electric heat, jumper W1 and W2 together if comfort control has only one stage of heat.
Electrical Data
Figure 2. A4AH4P18–37
Figure 3. A4AH4E42–60
