Installation Manual

484 01 3701 05 5
Specifications subject to change without notice.
REFRIGERANT LINE CONNECTIONS
PERSONAL INJURY HAZARD
Failure to follow this warning could result in personal injury.
Wear eye protection.
Coil is factory charged with 15 psi nitrogen. The coil is under
pressure and TXV screen is in place behind liquid line plug.
DO NOT remove liquid line plug first; always remove the
suction line plug first to depressurize the coil.
!
WARNING
NOTE: Factory nitrogen charge may escape past rubber plugs
during storage. This does not indicate a leaking coil nor warrant
return of the coil.
Refrigerant lines must be configured per local building codes and
the guidelines outlined in the OD units installation instructions.
Factory nitrogen charge may escape past rubber plugs during
storage. This does not indicate a leaking coil nor warrant return of
the coil.
Size and install refrigerant lines according to information provided
with outdoor unit. Coil connection tube sizes are shown in Table
3. Route refrigerant lines to the coil in a manner that will not
obstruct service access to the unit or removal of the filter.
Table 3 – Coil Connection Tube Size
NOTE: The filter dryer should be placed just before the indoor
unit.
Connect Refrigerant Liquid and Suction Lines
For matched and mismatched systems, use line sizes recommended
in outdoor unit Installation Instructions.
The coil can be connected to outdoor units using accessory
refrigerant line sets or field−supplied lines of refrigerant grade.
See Table 3 for coil connection tube size.
UNIT OR PROPERTY DAMAGE HAZARD
Failure to follow this caution may result in property damage.
Take precautions to ensure aluminum tubes do not come in
direct contact or allow for condensate run−off with a dissimilar
metal. Dissimilar metals can cause galvanic corrosion and
possible premature failure.
CAUTION
!
The coil can be connected to outdoor units using field−supplied
tubing of refrigerant grade. Always evacuate tubing and reclaim
refrigerant when making connections or flaring tubing. Leak check
connections before insulating entire suction line.
See Table 3 for coil connection tube size.
1. Remove cabinet access door.
2. Remove rubber plugs, suction plug then liquid plug, from
coil stubs using a pulling and twisting motion. Hold coil
stubs steady to avoid bending or distorting.
3. Remove tubing plate with rubber grommets and slide plate
with grommets onto the refrigerant lines (field line−set),
away from braze joints.
4. Fit refrigerant lines into coil stubs. Wrap a heat sinking
material such as a wet cloth behind braze joints.
5. Wrap TXV and nearby tubing with a heat−sinking material
such as a wet cloth.
6. Use 1/2 psig Nitrogen purge in the suction and out the
liquid line.
7. Braze using a Sil−Fos or Phos−copper alloy. Do not use soft
solder.
8. After brazing, allow joints to cool. Carefully remove TXV
bulb insulation and verify that the TXV bulb is securely
fastened with hose clamp. Tighten screw a half−turn past
hand tight with TXV bulb placed in the indentation with
full contact with the vapor line tube. Re−wrap TXV bulb
with insulation.
9. Leak check connections before insulating entire suction
line.
10. Slide tubing plate with rubber grommets over joints.
Position tubing at center of each grommet to ensure an air
seal around the tube. Reinstall cabinet door.
MODEL NUM-
BER
COIL CONNECTION
TUBE SIZE
in (mm)
Liquid Suction
ENH4X24L17A 3/8 (10) 5/8 (16)
ENH4X30L17A 3/8 (10) 3/4 (19)
ENH4X31L17A 3/8 (10) 3/4 (19)
ENH4X36L17A 3/8 (10) 3/4 (19)
ENH4X42L21A 3/8 (10) 7/8 (22)
ENH4X43L21A 3/8 (10) 7/8 (22)
ENH4X48L21A 3/8 (10) 7/8 (22)
ENH4X60L24A 3/8 (10) 7/8 (22)
ENH4X61L24A 3/8 (10) 7/8 (22)
UNIT DAMAGE HAZARD
Failure to follow this caution may result in product damage.
To avoid valve damage to the refrigerant control device while
brazing, valves must be wrapped with a heat−sinking material
such as a wet cloth.
CAUTION
!
CONDENSATE DRAIN LINE CONNECTION
PROPERTY DAMAGE HAZARD
Failure to follow this caution may result in property damage.
When installing over a finished ceiling and/or living area,
install a field−fabricated secondary condensate pan under the
entire unit.
CAUTION
!
The coil is designed to dispose of accumulated water through
built−in condensate drain fittings. It is recommended that PVC
fittings be used on the condensate pan. Do not over−tighten. Finger
tighten plus 1−1/2 turns. Be sure to install plastic plug in unused
condensate drain fitting. Two 3/4−in. female threaded pipe
connections are provided in each coil condensate pan.
A trap is not necessary on the condensate line. Consult local codes
for additional restrictions or precautions. If local codes require a
trap then the following guidelines are suggested to assure proper
drainage. Install a trap in condensate line of coil as close to the coil
as possible. Make trap at least 3 in. (76 mm) deep and no higher
than the bottom of unit condensate drain opening (See Fig. 8).
Pitch condensate line 1 in. (25.4 mm) for every 10 ft. of length to