Piping Size
For the correct tubing size, follow the specification for the condenser/heat pump.
WARNING
THIS COIL IS SHIPPED UNDER PRESSURE. FOLLOW THESE INSTRUCTIONS TO PREVENT INJURY (SEE
FIGURES 1 AND 2).
Evaporator Coil Metering Devices
Flowrater Models (ARUF and ARPF)
For most installations no change to the flowrater orifice is required. In
1.Loosen the 13/16 nut 1 TURN ONLY. No pressure loss indicates possible leak.
2.Remove the nut and discard the black or brass cap.
3.Remove the check piston to verify it is correct. See piston kit chart in instructions.
4.Use a tube cutter to remove the spin closure on the suction line.
5.Remove the tailpiece clamped to the exterior.
6.Slide the 13/16 nut into position. Braze tailpiece to the liquid tube.
7.Insert the suction line into the connection, slide the insulation and the rubber grommet at least 18" away from the braze joint.
8.AFTER THE TAILPIECE HAS COOLED, position the white Teflon seal and hand tighten the nut.
9.Torque the 13/16 nut to
10.Replace suction line grommet and insulation.
PLASTIC or BRASS CAP | APPLY FLOWRATER |
| GASKET FOR AIR |
| TIGHT APPLICATION |
13/16" NUT |
|
TXV Models (ARPT and AEPT)
IMPORTANT NOTE: In order to prevent damage to the sensing bulb, it is not permanently installed in the factory. This bulb is to be removed prior to brazing. Place in proper location after braze joint has cooled (Figure 3).
1.Loosen the 13/16 nut 1 TURN ONLY. No pressure loss indicates possible leak.
2.Remove the nut and discard the black or brass cap.
3.Remove large front panel and remove sensing bulb from suction manifold. TO PREVENT DAMAGE TO SENSING BULB, ENSURE BULB IS NOT NEAR FLAME OR IN CONTACT WITH SUCTION LINE OR MANIFOLD DURING BRAZING.
4.Use a tube cutter to remove the spin closure on the suction line.
5.Remove the tailpiece clamped to the exterior.
6.Slide the 13/16 nut into position (Figure 1). Braze tailpiece to liquid tube.
7.Insert the suction line into the connection, slide the insulation and the rubber grommet at least 18" away from the braze joint.
8.AFTER THE TAILPIECE HAS COOLED, position the white Teflon seal and hand tighten the nut.
9.Torque the 13/16 nut to
10.Replace sensing bulb to horizontal portion of suction line (Figure 3) just inside cabinet. Place bulb parallel with suction line in the 10 o’clock position. If 10 o’clock position is inaccessible, place in the 2 o’clock position. Secure bulb to line with strapping provided in literature envelope. Insulate sensing bulb to line with self- adhesive insulation provided in envelope.
11.Replace access panel, suction line grommet, and insulation.
REATTACH BULB HERE USING
STRAPPING AND INSULATION
PROVIDED
TAILPIECE
WHITE
PISTON
TEFLON SEAL
Figure 1
SUCTION LINE
WITH SPIN CLOSURE 
RUBBER
GROMMET
Figure 2
Figure 3
For the majority of installations, no adjustment to the TXV setting is required. However, if the measured superheat is less than 8° or greater than 20°, an adjustment is required. The adjustment stem is at the base of the valve (opposite the diaphragm) under the flare nut.
7 | 08/04 | |
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