10
EMI Products are subject to ongoing development.
Products & Specifications may change without notice.
H
EATING
This unit is designed to utilize two-stage heating. The
first stage being the compressor and the second electric heat.
The air handler will cycle the condenser on and off through
the yellow (Y) wire as it does in cooling; however; the re-
versing valve will
not
be energized. To check for a con-
denser signal:
Step 1-
Place the indoor unit in heating mode with the
Mode
button.
Step 2-
Using the
Up
arrow, place the setpoint tem-
perature one degree above room temperature.
Step 3-
With a voltmeter, check for 24 volts across the
yellow (Y) and brown (C) wires. The electric heat
should be off at this point.
Step 4-
With the
Up
arrow, select a setpoint tempera-
ture that is more than two degrees above the room tem-
perature. The electric heat should energize along with
the 24v compressor signal between Y and C. Check to
see that the amp draw corresponds with the electric
heat rating.
The following current values apply when the unit is
connected to a 230v power supply. These values include fan
motor current:
3kw (13.5 amps)
4kw (18 amps)
5kw (22.3 amps)
Units with electric heat have a strip heater located be-
hind the evaporator coil. The control relay for the heater in
located on the circuit board in the control box. A limit switch
located on the heater end plate will interrupt power to the
heater should the airflow become compromised. If tempera-
tures rise above the limit, setting a non-resetting one-time
fuse link will burn and the heater will remain off.
U
NITS
WITH
C
ONDENSATE
P
UMPS
Models WSP or WHP are available with an optional
condensate pump. Condensate pumps are recommended
when it is not possible to gravity drain the condensation from
the indoor unit. The condensate pump is located behind the
front control panel and has a maximum lift capability of 4
feet from the base of the unit.
NOTE:
Condensation generated by the
evaporator will collect in the pump reservoir.
When the water level is high enough, a float
switch will close and energize the pump,
clearing the water from the reservoir. Should,
for any reason, the water exceed the maximum
preset level, a secondary float will open a safety
switch, thereby cutting the (Y) signal to the
condenser. This will prevent the evaporator
from generating more condensation and
spilling out of the unit.
FREEZE PROTECTION
The indoor fan coil unit is protected in the event of
freeze up. If the evaporator falls below 32° F for more than
three minutes, the compressor is forced off. When the evapo-
rator temperature returns to 50° F, normal cooling opera-
tion resumes. If the evaporator returns to above 32° F but
remains below 50° F for 10 minutes, cooling operation will
also resume.
OPERATIONAL MODES
- Fan only
- Cooling only
- Cooling with optional indoor electric strip heat
- Cooling/Heatpump with optional electric strip heat
O
N
/O
FF
S
WITCH
The
On/Off
switch is used to turn the equipment on or
off. In the
Off
mode, the LCD will be blank and all LED
indicator lights will be dark. To turn the unit on press the
On/Off
button once. The LCD will display the room tem-
perature and LED indicators will light up to show fan speed
and mode selection.
I
NITIAL
S
TARTUP
Upon initial power-up the unit will start in
Fan
only
mode at
High
speed. These are the default settings of the
microprocessor. Once temperature and mode selections have
been made, they will be stored in the microprocessor memory
when the unit is switched off. The next time the unit is
switched back on via the
On/Off
switch, the stored settings
will be used and the unit will resume operation. If power is
lost, the equipment will return to an
Off
state (if it was on)
and any temperature or mode settings will be lost.
M
ODE
S
WITCH
(S
YSTEM
S
WITCH
)
The
Mode
button will allow the selection of the de-
sired mode. Colored LED indicators will light next to the
selected mode. With each successive press of the
Mode
but-
ton, selection will rotate between
Heat, Cool
and
Fan
. There
is a 7 second time delay after the mode button is released
before the execution of the selection to prevent the unit from
starting prematurely.
F
AN
O
PERATION
These units utilize a two-speed motor with three op-
erational fan modes. The
Fan
button will allow the selec-
tion of the desired fan mode. With each successive press of
the
Fan
button, selection will rotate between
High, Low,
and
Auto
. In
Fan
mode,
Auto
is bypassed and only
High
or
Low
are available. An amber LED indicator will light next to the
fan speed selection. If
Auto
fan speed is selected then an
LED indicator will also light next to
Auto
.
High
and
Low
selections are constant fan settings.
