Carrier CNPFU Series User manual

CNPFU
CNRFU
Installation Instructions
Manufactured Housing
Evaporator Coils
NOTE: Read the entire instruction manual before starting the
installation.
TABLE OF CONTENTS
PAGE
SAFETY CONSIDERATIONS 1........................
INTRODUCTION 1..................................
INSTALLATION 1...................................
Procedure 1 -- Inspect Equipment 1...................
Procedure 2 -- Install Coil 1.........................
Procedure 3 -- Connect Refrigerant Tubing 2............
Procedure 4 -- Install Condensate Drain 2...............
START--UP 3........................................
Procedure 1 -- Mechanical Connection Repair 3..........
Procedure 2 -- Reconnecting Refrigerant Tubing 3........
SAFETY CONSIDERATIONS
Improper installation, adjustment, alteration, service,
maintenance, or use can cause explosion, fire, electrical shock, or
other conditions which may cause personal injury or property
damage. Consult a qualified installer, service agency, or your
distributor or branch for information or assistance. The qualified
installer or agency must use factory--authorized kits or accessories
when modifying this product. Refer to the individual instructions
packaged with the kits or accessories when installing.
Follow all safety codes. Wear safety glasses and work gloves. Use
quenching cloth for brazing operations. Have fire extinguisher
available. Read these instructions thoroughly and follow all
warning or cautions attached to the unit. Consult local building
codes and National Electrical Code (NEC) for special
requirements.
Recognize safety information. This is the safety--alert symbol
. When you see this symbol on the unit and in instructions or
manuals, be alert to the potential for personal injury.
Understand the signal word DANGER, WARNING, or
CAUTION. These words are used with the safety--alert symbol.
DANGER identifies the most serious hazards which will result in
severe personal injury or death. WARNING signifies a hazard
which could result in personal injury or death. CAUTION is used
to identify unsafe practices which may result in minor personal
injury or product and property damage. NOTE is used to
highlight suggestions that will result in enhanced installation,
reliability, or operation.
ELECTRICAL OPERATION HAZARD
Failure to follow this warning could result in personal
injury or death.
Before installing or servicing system, always turn off main
power to system. There may be more than one disconnect
switch. Turn off accessory heater power if applicable.
!WARNING
PERSONAL INJURY HAZARD
Failure to follow this caution may result in personal injury.
This coil contains nitrogen precharge of up to 15 PSI.
Release of this pressure through the center of the rubber
plug is required before removing the plugs.
CAUTION
!
IMPORTANT: Nitrogen can leak out through the hole that the
needle pierced in the plugs. This does not indicate a leaking coil
nor warrant return of the coil.
INTRODUCTION
The CNPFU/CNRFU coils are designed to be used within a gas
or electric downflow furnace certified for use in manufactured
homes (mobile homes).
The CNPFU/CNRFU coils are for use on the outlet (supply) side
of the furnace only. This reduces condensate formation in the
furnace heat exchanger during the cooling cycle.
INSTALLATION
PROCEDURE 1 — INSPECT EQUIPMENT
File claim with shipper if shipment is damaged.
PROCEDURE 2 — INSTALL COIL
1. Disconnect power to furnace.
2. Remove furnace front access doors.
3. Remove furnace inner sheet metal shield.
4. Remove knockouts from furnace cabinet and inner shield.

2
5. Assemble the two halves of coil header plate over the coil
tubes and fasten together using supplied screws. (On
some furnace models, the top edge of the upper half of the
header plate may need to be bent for proper screw hole
alignment.)
6. Slide rubber grommets into place around coil tubes and
into coil header plate holes.
7. Position rails inside furnace as shown in Fig. 1. Slide coil
into furnace, nesting drain pan inside rails. (On some
furnace models, the tabs on the rails may need to be bent
up for proper fit.)
8. Align furnace inner shield (removed earlier) with coil
header plate so that the refrigerant tubes fit through the
knockouts. Fasten shield to header plates using supplied
screws.
9. Replace furnace front access doors.
A05435
Fig. 1 Rails and Coil Installation
PROCEDURE 3 — CONNECT REFRIGERANT TUBING
See Table 1 for coil connection sizes. Outdoor units may be
connected to indoor sections using the field--supplied
refrigerant--grade tubing of correct size and condition.
Table 1—Coil Connection Tube Size (In.)
Model Number Liquid Suction
CN(P,R)FU2418ACA 3/8 5/8
CN(P,R)FU3618ACA 3/8 3/4
CN(P,R)FU4818ACA 3/8 3/4
UNIT OR PROPERTY DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
If undersized, damaged, or elliptically shaped tubing is used
when making connections, leaks may result.
CAUTION
!
When tubing package is used and mechanical connections are
made within 60 sec, coils do not require evacuation. Entire
suction tube must be insulated to prevent condensate damage
within furnace cabinet.
Connect refrigerant liquid and suction tubes to compatible fittings
on coil, using backup wrenches. Make suction tube connection
first, then liquid tube connection.
For a mix--match system, use suction tube sizes recommended in
outdoor unit Installation Instructions.
A. Mechanical Connection
1. Loosen lock nut on compatible fitting one turn. Do not
remove.(SeeFig.2.)
LOCKNUT
O-RING
RUBBER
PLUG
A86154
Fig. 2 Compatible Fitting
2. Remove plug making sure O--ring is in the groove inside
compatible fitting.
3. Cut tubing to correct length. Insert tube into compatible
fitting until it bottoms.
4. Keep compatible fitting bottomed. Tighten lock nut using
backup wrench until it contacts back of coupling flange.
B. Refrigerant Metering Device
1. CNPFU MODELS -- These coils have a factory--installed
hard shut--off TXV designed only for use with Puron,
R--410A, refrigerant. Use only with outdoor units
designed for Puronrefrigerant, R--410A.
2. CNRFU MODELS -- These coils have a factory--installed
hard shut--off TXV designed only for use with R--22
refrigerant. Use only with outdoor units designed for
R--22.
NOTE:All TXVs have preset superheat settings and are not
field adjustable.
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.
PROCEDURE 4 — INSTALL CONDENSATE DRAIN
Coil is provided with two 3/4 in. NPT condensate drain
connections. The lower connection is the primary drain, and
the higher connection is the secondary (overflow) drain.
Coil is provided with flexible drain tubing, 90combination
fitting, and P--trap. (See Fig. 3.)
1. Thread the 90combination fitting into the primary (lower)
drain. Use pipe dope and do not over tighten.
2. Determine where the P--trap will be placed. NOTE: Keep
the P--trap as close to the coil as possible. P--trap must be
positioned lower than the bottom of the drain pan. (See Fig.
3.)
3. Cut a length of the flexible tubing and install it from the 90
combination fitting to the P--trap.
4. Install the remainder of the flexible tubing to the outlet side
of the P--trap and route the tubing to the outside. Check local
codes before connecting to a waste (sewer) line.
CNPF / CNRF

3
9
0˚ Combination Fitting
FlexibleTubing
Cut from longer piece
P-Trap
Lower than Drain Pan
FlexibleTubing
Route to the outsid
e
A05436
Fig. 3 Condensate Drain
NOTE: Route hose so that it does not obstruct access to the
filter.
5. Prime the trap, test for leaks, and insulate drain lines where
sweating could cause water damage.
6. If a gravity drain cannot be used, install a condensate
pump. Install the pump as close to the indoor section as
possible.
If secondary drain is required, fabricate a similar hose and P--trap
and install to the secondary (higher) drain pan connection.
If coil is located in or above a living space where damage may
result from condensate overflow, a separate 3/4 in. drain must be
provided from secondary (overflow) drain connection. Run this
drain to a place in compliance with local installation codes where
it will be noticed when unit is operational. Condensate flowing
from secondary (overflow) drain indicates a plugged primary
drain -- unit requires service or water damage will occur.
NOTE: For downflow electric furnace, the secondary (overflow)
drain connection must be installed to prevent possibility of water
dripping onto live electrical components.
UNIT OR PROPERTY DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
Failure to install trap can result in condensate flowing out of
coil pan and into furnace. Install trap in furnace or outside
under floor.
CAUTION
!
START--UP
Refer to outdoor unit Installation Instructions for system start--up
and refrigerant charging details.
PROCEDURE 5 — MECHANICAL CONNECTION
REPAIR
1. Pump down unit and frontseat condensing unit service
valves.
2. Back lock nut off compatible fitting onto tube at indoor
evaporator coil. (See Fig. 4.)
3. Cut fitting with hacksaw between threads and O--ring.
4. Remove tubing section remaining in threaded portion of
fitting. Discard lock nut.
TUBING
LOCKNUT
O-RING
COMPATIBLE FITTING
CUT HERE
A86157
Fig. 4 Repair of Mechanical Connection
PROCEDURE 6 — RECONNECTING REFRIGERANT
TUBING
1. Remove all burrs and fittings from remaining portion of
compatible fitting.
CNPF / CNRF

4
2. Insert tube end into remaining portion of compatible
fitting.
3. Solder with low--temperature (430F) silver alloy solder.
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
Wrap a wet cloth around rear of fitting to prevent damaging
factory--made joints.
CAUTION
!
4. Evacuate evaporator coil and tubing at condensing unit
service valves reclaiming refrigerant.
5. Operate system for 10 minutes.
6. Adjust charge to required superheat.
Copyright 2017 CAC / BDP S7310 W. Morris St. SIndianapolis, IN 46231
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
Catalog No: IM--CNPF--03
Replaces: IM--CNPF--02
Edition Date: 07/17