IEC E055-71520301 User manual

Auto-Changeover is available in 4-pipe systems,
in 2-pipe systems with Electric Heat, or when
used with G100-71520306 accessory, auto-
changeover sensor.
FAN COIL
NON-PROGRAMMABLE
DIGITAL THERMOSTAT
Copyright 2007, International
Environmental Corp. All Rights Reserved
72
74
70
COOL
HEAT
AUTO
P/N E055-71520301
P/N E055-71520304
INSTALLATION
INSTRUCTIONS
2- OR 4-PIPE NON-PROGRAMMABLE

Step #1: Preparation
Step #2: Remove & Replace
Old Thermostat
Sample Wiring Diagrams
Step #4: Test Operation
Trouble Shooting
2
3
6
11
16
P/N E055-71520301 and P/N E055-71520304
Table Of Contents
Page 1
CAUTION
WARNING
Follow Installation Instructions
carefully. Disconnect Power
to the Heater/Air Conditioner
before removing the old therm-
ostat and installing the new
thermostat.
Copyright 2007, International
Environmental Corp. All Rights Reserved
Step #3: Wire Connections
4
Warranty
18

Drill with 3/16
inch Drill Bit
(when not
using j-box)
Proper installation of the thermostat will be
accomplished by following these step by step
instructions. If you are unsure about any of
these steps, call a qualified technician for
assistance.
Assemble tools.
Flat Blade
Screwdriver Wire cutter
& Stripper
Make sure your Heater/Air Conditioner is
working properly before beginning installation
of the thermostat.
Carefully unpack the thermostat. Save the
screws, wall anchors, and instructions.
STEP #1
PREPARATION
Turn off the power to the Heating/Air
Conditioning system at the main fuse panel.
Page 2

Remove the cover of the old thermostat.
If it does not come off easily check for
screws.
Loosen the screws holding the thermostat
base or subbase to the wall and lift away.
Disconnect the wires from the old
thermostat. Tape the ends of the wires
as you disconnect them and mark them
with the letter of the terminal for easy
reconnection to the new thermostat.
Keep the old thermostat for reference
purposes until your new thermostat is
functioning properly.
STEP #2
REMOVE & REPLACE OLD THERMOSTAT
Note: This thermostat is strictly a low voltage control.
One or two E025-71520303 relay boards must be
installed to isolate the 24 volt wires from the line
voltages to the fan, and possibly the water valves.
(IF APPLICABLE)
Page 3

If the terminal designations on your old
thermostat do not match those on the
new thermostat, refer to the chart below,
or the wiring diagrams that follow.
STEP #3
WIRE CONNECTIONS
Page 4
4-PIPE SYSTEMS
Wire from the
old thermostat
terminal marked
Install on the
new thermostat
terminal marked
Function
Cooling
Heating
Power
Common
Low
Fan Speed
Medium
Fan Speed
High
Fan Speed
Y1
W1
R
C
G
G2
G3
Y1, Y or C
W1, W or H
Rh, R, M, Vr, A
C
G, F or LOW
MED
HIGH
Note: Be sure to seal any opening through
the wall behind the thermostat to prevent
improper temperature sensing of the
conditioned space.

If the terminal designations on your old
thermostat do not match those on the
new thermostat, refer to the chart below,
or the wiring diagrams that follow.
STEP #3
WIRE CONNECTIONS
Page 5
2-PIPE SYSTEMS
Wire from the
old thermostat
terminal marked
Install on the
new thermostat
terminal marked
Function
Water Valve
Strip Heater
Power
Common
Low
Fan Speed
Medium
Fan Speed
High
Fan Speed
Y1
W1
R
C
G
G2
G3
Y1, Y or C
W1, W or H
Rh, R, M, Vr, A
C
G, F or LOW
MED
HIGH
Note: Be sure to seal any opening through
the wall behind the thermostat to prevent
improper temperature sensing of the
conditioned space.

COM
G3/(Y)
G2/(W)
G
LO
MED
HI
(HEAT)
(COOL)
(VALVE)
FAN
COM
G3/(Y)
G2/(W)
G
LO
MED
HI
(HEAT)
(COOL)
(VALVE)
FAN
24vac
R
C
Sample Wiring Diagram
COM
COM
G
G
G3(Y)
G3(Y)
G2(W)
G2(W)
VALVE
FAN
R
C
G2
W1
G3
Y1
G
E025-71520303
Thermostat
E025-71520303 E025-71520303
4-Pipe, 2 Relay Boards, Line Voltage Water Valves
Page 6

COM
G3/(Y)
G2/(W)
G
LO
MED
HI
(HEAT)
(COOL)
(VALVE)
FAN
R
C
Sample Wiring Diagram
4-Pipe, Low Voltage Valves, Duct Temperature
Sensor & Dry Contact
COM
G
G3(Y)
G2(W)
RS+5
RS GND
RS
Dry Contact
Duct Sensor
G100-71520307
R
C
R
C
G2
G3
G
RS+5
RS
H2O
Ck1
Y1
W1 H C
24 Volt Water
Valves
E025-71520303
E025-71520303
Thermostat
24vac
Important Note: If a
Duct sensor is conn-
ected to this thermostat
it is suggested that the
fan be programmed for
continuous operation
(step #5, page 11 of the
Owner’s Manual).
Page 7

COM
G3/(Y)
G2/(W)
G
LO
MED
HI
(HEAT)
(COOL)
(VALVE)
FAN
R
C
Sample Wiring Diagram
2-Pipe, Low Voltage Valve, Heat Only or Cool Only
COM
G
G3(Y)
G2(W)
R
C
G2
W1
G3
G
V
Y1
Thermostat
24 Volt Water
Valve
24vac
E025-71520303
E025-71520303
Page 8

COM
G3/(Y)
G2/(W)
G
LO
MED
HI
(HEAT)
(COOL)
(VALVE)
FAN
R
C
Sample Wiring Diagram
2-Pipe, Low Voltage Valve, H2O Changeover Sensor
COM
G
G3(Y)
G2(W)
RS+5
RS GND
RS
R
C
R
C
G2
G3
G
RS+5
RS
H2O
V
Y1
Duct Sensor
G100-71520307
H O Changeover Sensor
G100-71520306
2
E025-71520303
24 Volt Water
Valve
24vac
Important Note: If a
Duct sensor is conn-
ected to this thermostat
it is suggested that the
fan be programmed for
continuous operation
(step #5, page 11 of the
Owner’s Manual).
Thermostat
E025-71520303
Page 9

COM
G3/(Y)
G2/(W)
G
LO
MED
HI
(HEAT)
(COOL)
(VALVE)
FAN
R
C
Sample Wiring Diagram
2-Pipe, Low Voltage Valve, Chilled Water
with Electric Strip Heat
COM
G
G3(Y)
G2(W)
R
C
G2
G3
G
VVR
Y1
W1
E025-71520303
Page 10
24 Volt Cold
Water Valve
24vac
24 Volt Relay to
Control Strip Heater
E025-71520303
Thermostat

Press the MODE button repeatedly until the
HEAT icon appears on the display. Press the UP
or DOWN buttons until the set temperature is 10
degrees above room temperature. The hot water
valve will open and the fan will be running.
Press the MODE button repeatedly until the
COOL icon appears on the display. Press the UP
or DOWN buttons until the set temperature is 10
degrees below room temperature. The cold water
valve will open and the fan will be running.
Turn the power on to the Fan Coil Unit.
Press the UP button until the setpoint is equal to
the room temperature. Press the Fan button
repeatedly until a single bar appears next to the
Fan icon. Confirm the fan is running on low
speed. Press the Fan button again, confirm the
fan is running on medium speed. Again, press
the Fan button, confirm the fan is running at high
speed. Press the Fan button once more, the
bars next to the Fan icon should disappear.
Press the MODE button repeatedly until the OFF
icon appears on the display. Both valves will be
closed and the fan will be off.
STEP #4
TEST OPERATION
4-PIPE SYSTEM
Page 11

If hot water is available, press the MODE button
repeatedly until the HEAT icon appears on the
display. Press the UP or DOWN buttons until the
set temperature is 10 degrees above room
temperature. The hot water valve will open and the
fan will be running.
If cold water is available, press the MODE button
repeatedly until the COOL icon appears on the
display. Press the UP or DOWN buttons until the
set temperature is 10 degrees below room
temperature. The cold water valve will open and
the fan will be running.
Press the UP button until the setpoint is equal to
the room temperature. Press the Fan button
repeatedly until a single bar appears next to the
Fan icon. Confirm the fan is running on low
speed. Press the Fan button again, confirm the
fan is running on medium speed. Again, press
the Fan button, confirm the fan is running at high
speed. Press the Fan button once more, the
bars next to the Fan icon should disappear.
Press the MODE button repeatedly until the OFF
icon appears on the display. Both valves will be
closed and the fan will be off.
2-PIPE, CHANGEOVER SENSOR, NO STRIP HEAT
STEP #4
TEST OPERATION
Page 12
Turn the power on to the Fan Coil Unit and confirm
that the thermostat is programmed correctly in setup
steps #3 and #4 on page 11 of the Owner’s Manual.

If hot water is available, press the MODE button
repeatedly until the HEAT icon appears on the
display. Press the UP or DOWN buttons until the
set temperature is 10 degrees above room
temperature. The hot water valve will open and the
fan will be running.
If cold water is available, press the MODE button
repeatedly until the COOL icon appears on the
display. Press the UP or DOWN buttons until the
set temperature is 10 degrees below room
temperature. The cold water valve will open and
the fan will be running.
Press the MODE button repeatedly until the OFF
icon appears on the display. Both valves will be
closed and the fan will be off.
Press the UP button until the setpoint is equal to
the room temperature. Press the Fan button
repeatedly until a single bar appears next to the
Fan icon. Confirm the fan is running on low
speed. Press the Fan button again, confirm the
fan is running on medium speed. Again, press
the Fan button, confirm the fan is running at high
speed. Press the Fan button once more, the
bars next to the Fan icon should disappear.
2-PIPE, NO CHANGEOVER SENSOR
STEP #4
TEST OPERATION
Page 13
Turn the power on to the Fan Coil Unit and confirm
that the thermostat is programmed correctly in setup
steps #3 and #4 on page 11 of the Owner’s Manual.

If hot water is available, press the MODE button
repeatedly until the HEAT icon appears on the
display. Press the UP or DOWN buttons until the
set temperature is 10 degrees above room
temperature. The hot water valve will open and the
fan will be running. The strip heat will be locked
out if hot water is available.
If cold water is available, press the MODE button
repeatedly until the COOL icon appears on the
display. Press the UP or DOWN buttons until the
set temperature is 10 degrees below room
temperature. The cold water valve will open and
the fan will be running.
If hot water is not available, but your unit is
equipped with a strip heat system, press the UP or
DOWN buttons until the set temperature is 10
degrees below room temperature. The unit should
energize the strip heaters and the fan will be
running.
2-PIPE, CHANGEOVER SENSOR, WITH STRIP HEAT
STEP #4
TEST OPERATION
Page 14
Turn the power on to the Fan Coil Unit and confirm
that the thermostat is programmed correctly in setup
steps #3 and #4 on page 11 of the Owner’s Manual.

Press the MODE button repeatedly until the OFF
icon appears on the display. Both valves will be
closed and the fan will be off.
Press the UP button until the setpoint is equal to
the room temperature. Press the Fan button
repeatedly until a single bar appears next to the
Fan icon. Confirm the fan is running on low
speed. Press the Fan button again, confirm the
fan is running on medium speed. Again, press
the Fan button, confirm the fan is running at high
speed. Press the Fan button once more, the
bars next to the Fan icon should disappear.
2-PIPE, CHANGEOVER SENSOR, WITH STRIP HEAT
STEP #4
TEST OPERATION
Page 15

SYMPTOM: The fan will not run in all three
speeds or switches speeds in an improper order.
CAUSE: Incorrect wiring between the thermostat
and the relay board, or between the relay board
and the fan wires.
REMEDY: Recheck the wiring (G=low speed,
G2=medium speed, G3=high speed).
SYMPTOM: Cold water valve opens for either a
cool or a heat demand in a 4-pipe system.
CAUSE: The thermostat has been programmed
for the incorrect type of fan coil.
REMEDY: Confirm that you have entered the
correct programming for your type of fan coil
system (steps #3 and #4, page 11 of the
Owner’s Manual).
SYMPTOM: The water valve does not open at all
in 2-pipe configurations.
CAUSE: The thermostat has been programmed
for the incorrect type of fan coil system or the fan
coil is not wired to the thermostat correctly.
REMEDY: Program the thermostat for a 2-pipe
fan coil (step #3, page 11 of the Owner’s Manual).
Also, make certain that the water valve is wired to
the Y1 terminal.
TROUBLESHOOTING
SYMPTOM: Parts of the thermostat display are
missing.
CAUSE: The thermostat has been programmed
for a minimal display.
REMEDY: Program the thermostat for Full
Display (step #1, page 10 of the Owner’s
Manual).Page 16

SYMPTOM: The thermostat displays large set-
point digits instead of the room temperature.
CAUSE: The thermostat has been programmed
to display Single Setpoint.
REMEDY: Program the thermostat to display
Dual Setpoint (step #2, page 10 of the Owner’s
Manual).
SYMPTOM: The thermostat display is stuck in
Unoccupied.
CAUSE: The sensor connected to the Dry Contact
terminals of the thermostat, is active, forcing the
unit into ‘Unoccupied.’
REMEDY: Verify proper wiring between the
thermostat and the occupancy sensor and verify
that the wiring is not shorted.
If no sensor is connected, program the Dry
Contact polarity for Normally Open (step #11,
page 13 of the Owner’s Manual).
TROUBLESHOOTING
Page 17

SYMPTOM: The thermostat will only allow Heat
or Off in 2-pipe installations, even though chilled
water is available.
CAUSE: Faulty, improperly wired, or improperly
installed H2O changeover sensor.
REMEDY: Confirm proper wiring of the change-
over sensor (between R and H2O). Confirm
proper placement of the sensor (good mechanical
coupling for temperature transfer).
Test the changeover sensor as follows:
1. Remove power from the fan coil system.
2. Disconnect the wire between the sensor and
the H2O terminal.
3. Place an ohmmeter between R and the wire
just disconnected from the sensor.
4. A good sensor will show continuity whenever
the water temperature is confirmed to be at or
below 65 degrees. If the sensor is open when
the water temperature is confirmed to be at or
below 65, replace the sensor.
P/N 88-572
Rev. 2
TROUBLESHOOTING
4Z95
C
c
F
IEC E055-71520301-304
Tested to
Comply with
FCC Standards
For Home Or Office Use
P.O. Box 2598 • Oklahoma City, OK 73101-2598 405.605.5000 [phone] 405.605.5001 [fax] www.iec-okc.com• • •
©2007 International Environmental Corporation (IEC). IEC is a subsidiary of LSB Industries, Inc. - AMEX symbol LXU; www.lsb-okc.com
I100-90006967