24
E-mail: [email protected]
Made in Rome, New York, USA
COOLING ONLY UNITS
Cooling only units use three interconnecting,
low Volt
wires on both the indoor and outdoor units. The yellow, red
and brown wires of the air handler should be connected to
the corresponding yellow red and brown wires of the con-
denser.
A 24V transformer typically located in the con-
densing unit
provides low volt control power to both the air
handler and condenser. The 24V-power supply can be mea-
sured by placing a meter across the red (R) and brown (C)
wires. The air handler will switch on and off the condenser
through the yellow (Y) wire. When the air handler is calling
for cooling, 24V can be measured between terminals (wires)
Y and C.
NOTE: When connecting an EMI evaporator to a
non-EMI condenser, a transformer may have to be
added to the system to provide 24V power to the
equipment. Not all condenser manufactures sup-
ply a low Volt transformer with their condenser.
COOLING ONLY UNITS
WITH ELECTRIC HEAT
Cooling only units with electric heat use three intercon-
necting,
low Volt
wires on both the indoor and outdoor units.
The yellow, red and brown wires of the air handler should be
connected to the corresponding yellow red and brown wires
of the condenser.
A 24V transformer typically located in
the condensing unit
provides low volt control power to both
the air handler and condenser. The 24V-power supply can
be measured by placing a meter across the red (R) and
brown (C) wires. The air handler will switch on and off the
condenser through the yellow (Y) wire. When the air han-
dler is calling for cooling, 24V can be measured between
terminals (wires) Y and C.
Units with electric heat utilize a control relay located on
the circuit board in the control box. As a safety feature, an
auto resetting limit switch located on the heater end plate
or on the heater assembly will interrupt power to the heater
should an over-heat condition occur. Each electric heat as-
sembly is also equipped with a one time fuse link. Should
electric heat temperatures rise above the auto resetting limit
switch, a non-resetting, one time fuse link will open and the
heater will remain off.
The following current values apply when the unit is con-
nected to a 230V power supply. These values include fan
motor current.
7KW = 31.0 AMPS
5KW = 22.3 AMPS
3KW = 13.5 AMPS
OPTIONAL HEAT PUMP
WITH ELECTRIC HEAT
Heat pump units with electric heat use five intercon-
necting,
low Volt
wires on both the indoor and outdoor units.
The yellow (Y), red (R), white (W), orange (O) and brown (C)
wires of the air handler should be connected to the corre-
sponding yellow red, white, orange and brown wires of the
condenser.
A 24V transformer typically located in the
condensing unit
provides low volt control power to both
the air handler and condenser. With high volt power sup-
plied to the condenser, 24V can be measured across the
red (R) and brown (C) wires at all times.
COOLING
The air handler will cycle the condenser on and off
through the yellow (Y) wire. To check for a condenser sig-
nal, select cooling mode on the indoor unit and place the
set-point temperature below room temperature. Then, with
a voltmeter check for 24 Volts across the yellow (Y) and
brown (C) wires.
EMI Heat Pump
systems utilize a reversing valve is
that is energized in the cooling mode. The reversing-valve
signal is provided through the orange (O) low volt wire of the
air handler. It will remain energized constantly as long as
the indoor unit remains in cooling mode. To check for 24V
reversing valve voltage, place a voltmeter across the brown
(C) and orange (O) wires while the indoor unit is in the cool-
ing mode.
TROUBLESHOOTING PROCEDURE
Continued
