INSTALLATION GUIDE
EFM / ELB Series Installation Guide
Page 3
REFRIGERANT PIPING
Refrigerant piping external to the unit shall be sized in
accordance with the instructions of the manufacturer of
the outdoor equipment.
METERING DEVICE
Optional air conditioning or heat pump coils are shipped
with a check
-
flow piston installed which is designed for air
conditioning or heat pump operation. If your application
requires a thermal expansion valve or check expansion
valve then it is necessary to remove the piston from the
distributor assembly and install the proper metering
device. Be sure to follow the instruction in the kit to
ensure proper installation.
WIRING
Consult all schematic and pictorial wiring diagrams of
this unit and the outdoor equipment to determine
compatibility of the wiring connections and to determine
specific requirements.
All field wiring to the blower coil should be installed in
accordance with the latest edition of the National Electric
Code NFPA No. 70 and any local codes.
Check rating plates on unit for rated volts, minimum
circuit ampacity and maximum over current protection.
Supply circuit power wiring must be 75
°
C. (167
°
F)
minimum copper conductors only. Copper supply wires
shall be sized to the National Electric Code or local code
requirements, whichever is more stringent.
The unit is shipped wired for 230/240 Volt AC
,
60 HZ
,
1
Phase operation. If the unit is to be operated at 208
VAC
,
60HZ, then follow the instruction on the indoor unit
wiring diagram to change the low voltage transformer to
208 VAC operation.
Be sure the unit is properly grounded.
Class 2 low voltage control wiring should not be run in
conduit with power wiring and must be separated from
power wiring, unless class 1 wire of proper voltage rating
is used. Low voltage control wiring should be 18 Awg,
color coded (10
5
°
C minimum). For lengths longer
than 100ft., 16 Awg wire should be used. Make certain
that separation of control wiring and power wiring has
been maintained.
AIR FILTER
An air filter must be installed prior to the air entering the
evaporator coil to protect the coil, blower and other
internal parts from excessive dirt and dust. The door
must be securely fastened in place to ensure proper
filtration of the return air. A remote return air filter grille
may be
us
ed for ducted return air applications. Change
the filter every 30 days or as soon as dust or dirt appear
on the filter. Failure to change the filter in a timely
fashion can result in reduced airflow, increased
operating cost and may result in damage to the indoor
unit and or outdoor unit.
THERMOSTAT
Select a thermostat that is commonly referred to as a
single stage cooling with electric heat sub base. This
thermostat will energize the fan on a demand for heat or
cool.
Install the thermostat on an inside wall, away from drafts,
lights or other heat sources in a location that has good
air circulation from the other rooms being controlled by
the thermostat. The thermostat should be mounted 4 to
5 feet above the floor.
BLOWER
This unit is supplied with a multi-speed motor with a
direct drive blower wheel which can obtain various air
flows (See specification sheet for airflow data). The unit
is shipped with the blower connected for high speed. If a
lower blower speed is required, disconnect all power to
the unit, remove the black indoor fan motor lead from the
fan relay, place an insulated cap on the black lead,
remove the insulated cap from the red indoor fan motor
lead, place a spade connector on the lead and connect it
to the fan relay where the black lead was originally
connected. Be sure to check the air flow and the
temperature drop across the evaporator coil to ensure
that you have sufficient air flow.
