CNPHP: Installation Instructions
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
5
HORIZONTAL CRAWL SPACE INSTALLATION
As an alternate to horizontal attic installation, the CNPHP horizontal coil
can be installed in a crawl space by mounting on suitable blocks, pads or
by hanging from floor joists.
To suspend CNPHP:
1. Cut metal plumbers strap to desired lengths.
2. Attach metal plumbers strap to four corners of coil casing (
).
3. Use a minimum of two screws per corner to attach metal plumbers
strap to casing.
4. Position and secure coil in front of furnace discharge end.
5. Make sure coil is level for proper condensate drainage.
6. Using appropriate fasteners from duct type, connect supply-air duct
to coil.
A05421
Fig. 7 – Suspension with Plumbers Strap
REFRIGERANT LINE CONNECTIONS
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.
Size and install refrigerant lines according to information provided with
outdoor unit. Coil connection tube sizes are shown in
. Route
refrigerant lines to the coil in a manner that will not obstruct service
access to the unit or removal of the filter.
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
for coil connection tube size.
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
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.
WARNING
!
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.
2 Screws for
Attachment
to Casing
Plumbers
Strap
Table 3 – Coil Connection Tube Size
MODEL NUMBER
COIL CONNECTION TUBE SIZE
in (mm)
Liquid
Suction
CNPHP2417ALA
3/8 (10)
5/8 (16)
CNPHP3017ALA
3/8 (10)
3/4 (19)
CNPHP3617ALA
3/8 (10)
3/4 (19)
CNPHP4221ALA
3/8 (10)
7/8 (22)
CNPHP4321ALA
3/8 (10)
7/8 (22)
CNPHP4821ALA
3/8 (10)
7/8 (22)
CNPHP6024ALA
3/8 (10)
7/8 (22)
CNPHP6124ALA
3/8 (10)
7/8 (22)
CAUTION
!
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
!
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.
