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To access wiring diagram: 7multi-zone Heat Pump Condensing units a) Remove the four screws on the front panel of the unit and slide the panel down until the upper edge is free, then remove the panel. b) The wiring diagram is located on the inside of the front panel. wiring Diagram Common Suction Pressure Access Point HighPressure Reset (18 & 24) Vapor(Suction) Liquid eleCTriCal Wiring t2HB, t3HB, And t4HB InStAllAtIon InStructIonS SEctIon t2HB, t3HB, And t4HB InStAllAtIon InStructIonS SEctIon 5. with a screwdriver punch out and remove the knock-outs in the low & high Volt electrical connection box. Note: Power should be run to a weather proof disconnect box usually within 3 feet of the unit. 6. From the disconnect box feed the high Volt wires through a weather proof conduit and run the power through the 7/8" hole (from knock-out) in the unit’s electrical box. Anchor with a strain relief fitting. Refer to the wiring diagram. 7. Following the wiring diagram, run wires to the High Volt pigtail in the control box and attach L1 and L2 connections. Also run green wire to ground lug. High Volt Low Volt Knock-out MountingScrew 9. Connect the 24 Volt wiring matching color to terminal block designation for each zone as labeled. Refer to the wiring diagram on the inside front panel of the condenser, and also refer to the wiring diagram on the indoor unit. Low Volt interconnect should be at least 18 AWG. When connecting to the rear terminal strip there are two approaches. a) Using a long straight screw driver over the top of the front terminal strip while holding the wire with needle nose pliers from below. b) Remove the mounting screw (stubby screwdriver), then pull the entire front terminal strip forward, disengaging the tab on left from slot. When finished, reinsert terminal strip tab into slot and reinstall mounting screw. ! !CauTion Make sure that Low Volt wiring for each circuit is connected to the matching Low Volt wiring. 8. Check wiring diagram for the required num- 10. Replace the unit’s electric box cover and ber of low voltage wires to be run between the front panel and tighten screws. indoor and outdoor sections. 8multi-zone Heat Pump Condensing units MultI-zonE HEAt PuMP rEfrIgErAnt PIPIng InStAllAtIon noTe: Refrigerant Piping Installation for all of the multi-zone heat pump models. noTe: Refrigerant Piping Installation for all of the multi-zone heat pump models. inTerConneCTing TuBing SPeCSS2HB, T2HB, T3HB, & T4HB models: Nominal Circuit Capacity Maximum Length Maximum Lift Liquid Line OD Suction Line OD 9,000 100’ 35’ 1/4” 1/2” 12,000 100’ 35’ 1/4” 1/2” 18,000 100’ 35’ 3/8” 5/8”* 24,000 100’ 35’ 3/8” 3/4” * CAH24, UNH24, WLH24 Suction Connection size is 3/4” O.D. and must bush down to 5/8” for 18,000 Btuh circuits at the indoor unit. The system will support refrigerant runs to the inside unit of up to 100' equivalent feet with a 35' rise included. The units are furnished with sweat connections and are equipped with refrigerant valves and Schrader fittings for charging and taking pressure readings. The following precautions should be made: • Be certain no burrs remain on the fittings. • Use only clean refrigeration tubing. • Use tube benders to guard against kinking. • Avoid piping on wet and rainy days and insulate suction line. Be certain that plastic end caps remain in place when inserting through wall openings. Isolate tubing from transmitting vibration to the building or unit and avoid contact with sharp edges. refrigeration valves should be wrapped with a wet rag "heat sink" to protect valves while brazing. PiSTon/oriFiCe CHange KiT inSTallaTion When a WLH24 or UNH24 air handler is matched with a T2HB or T3HB containing a 24,000 Btuh nominal capacity circuit, the air handler must have it’s stock A 24,000 Btuh nominal circuit can be identified by the “4” in the model number capacity field (i.e. T2HBx4xx). Refer to the instructions sup- Circuit Designators: 9 = 9000 Btuh • 2 = 12000 Btuh • 8 = 18000 Btuh • 4 = 24000 Btuh Air Handler piston changed from 0.059 to 0.063. plied with kit part number; 240006777. (ex. - 8400 consists of one 18000 Btuh compressor and one 24000 Btuh compressor) model # air Handler Condenser Btuh Factory installed Piston/Orifice Size Field Changeover Piston/Orifice Size WLH24 or UNH24 T2HB2400 T2HB8400 T2HB4400 T3HB9940 T3HB9240 T3HB2240 .059” .063” Note: This kit is only supplied with the above Heat Pump models. 9multi-zone Heat Pump Condensing units P-trAP InStAllAtIon • A P-trap is recommended when the suction riser is equal to or greater than 20 feet in height. • When the condenser is installed above the evaporator, the P-trap will help the return of oil back to the compressor. • The placement of the P-trap should be at the halfway mark of the suction riser. For example if the suction riser is 30 feet tall then a P-trap is recommended at the 15 foot mark of the suction riser (see Figure #1). • A P-trap may be f...

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