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FEM4X, FEM4P, REM4X, REM4P: Installation Instructions
Speed taps 1, 2, and 3 have a 90 second blower off time delay
pre-programmed into the motor. Speed tap 4 is used for electric heat only
(with 0 second blower time delay) and the WHITE wire should remain
on tap 4. Speed tap 5 is used for high static applications, but has a 0
second blower time delay pre-programmed into the motor (see Airflow
Performance Tables for actual CFM for each tap). Also, see
motor speed selection location.
NOTE: In low static applications, lower motor speed tap should be used
to reduce possibility of water being blown off coil.
REFRIGERANT TUBING
Refrigerant Tubing Connection and Evacuation
Use accessory tubing package or field-supplied tubing of refrigerant
grade. Suction tube must be insulated. Do not use damaged, dirty, or
contaminated tubing because it may plug refrigerant flow-control
device. ALWAYS evacuate the coil and field-supplied tubing to 500
microns before opening outdoor unit service valves.
Units have sweat suction and liquid tube connections. Make suction tube
connection first.
1. Cut tubing to correct length.
2. Insert tube into sweat connection on unit until it bottoms.
3. Braze connection using silver bearing or non-silver bearing brazing
materials. Do not use solder (materials which melt below 800°F /
427°C). Consult local code requirements.
4. Evacuate coil and tubing system to 500 microns using deep vacuum
method.
Size and install refrigerant lines according to information provided with
outdoor unit. Route refrigerant lines to the fan coil in a manner that will
not obstruct service access to the unit or removal of the filter.
1. Find the liquid tube grommet in the small-parts bag and slide it onto
the liquid refrigerant line (field line-set).
2. Remove the lower door. Remove the tubing plate (with suction tube
grommet) and slide the plate with grommet onto the refrigerant
lines (field line-set), away from braze joints.
3. Remove rubber plugs from coil stubs using a pulling and twisting
motion. Hold coil stubs steady to avoid bending or distorting.
4. Wrap TXV and nearby tubing with a heat-sinking material such as a
wet cloth.
5. Fit refrigerant lines into coil stubs. Wrap a heat sinking material
such as a wet cloth behind braze joints.
6. Braze using a Sil-Fos or Phos-copper alloy.
7. After brazing, allow joints to cool. Slide tubing plate back into
place and position grommets around suction and liquid tubes to
ensure air seal.
CAUTION
!
PRODUCT DAMAGE HAZARD
Failure to follow this caution may result in product damage.
Wrap a wet cloth around rear of fitting to prevent damage to piston
assembly or TXV and factory-made joints.
REFRIGERANT FLOW-CONTROL DEVICE
FEM4P Models:
These units come equipped with a factory installed Piston metering
device with Teflon ring. If a piston replacement is required, check piston
size shown on indoor unit rating plate to see if it matches required
outdoor piston size. The outdoor piston size will be found on the outdoor
unit rating plate, product data or installation instructions depending on
the model shown on outdoor unit rating plate. If the fan coil piston does
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
not match, replace indoor piston with correct outdoor piston. With some
outdoor units a piston is shipped with outdoor unit.
When changing piston, use a back-up wrench. Hand tighten hex nut,
then tighten with wrench 1/2 turn. Do not exceed 30 ft-lbs.
NOTE: The indoor piston contains a Teflon ring (or seal) which is used
Fig. 14
for
to seat against the inside of distributor body, and must be installed
properly to ensure proper seating in the direction for cooling operation.
Always use outdoor units designed to match indoor fan coil applications.
REFRIGERANT METERING DEVICE
FEM4X, REM4X, FXM4X Models:
These Fan Coils have a factory installed hard shut-off TXV designed
only for use with R-410A refrigerant. Use only with outdoor units
designed for R-410A.
TXV is factory set and not field adjustable.
PRODUCT DAMAGE HAZARD
Failure to follow this caution may result in product damage.
This Fan Coil has a hard shut-off TXV metering device. A compressor
Hard Start Kit is REQUIRED in all applications where the matching
outdoor unit has a single-phase reciprocating compressor.
PRODUCT OPERATION HAZARD
Failure to follow this caution may result in improper product operation.
If using a TXV in conjunction with a single-phase reciprocating
compressor, a compressor start capacitor and relay are required.
Consult outdoor unit pre-sale literature for start assist kit part number.
BRASS
HEX NUT
Fig. 15 – Refrigerant Flow-Control Device
CONDENSATE DRAINS
Unit is provided with primary and secondary 3/4" (19mm) NPT drain
connections. Refer to
the primary and secondary locations. To prevent property damage and
achieve optimum drainage performance, BOTH primary and secondary
drain lines should be installed and include properly sized condensate
8
CAUTION
!
CAUTION
!
TEFLON SEAL
TEFLON RING
PISTON
FLOW IN
COOLING
PISTON
RETAINER
STRAINER
Fig.
2,
Fig.
3,
Fig.
4,
Fig.
5, and
DISTRIBUTOR
BRASS
HEX BODY
A09677
Fig. 6
to identify
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