Installation, Operation & Application Guide
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Auto Changeover
24-277 VAC Hardwire
SC900V
2 or 4 Pipe Fan Coil Thermostat, 3 Speed
• 2-pipe systems
• 4-pipe systems
• Pipe sensor compatible
• Configurable
• Large display with backlight
• Selectable fahrenheit or celsius
• Relay outputs (minimum voltage drop in thermostat)
• Remote sensor compatible
Specifications
Electrical rating:
24-277 VAC, 6 amp maximum per output
Temperature control range:
45°F to 90°F (7°C to 32°C)
Accuracy:
± 1°F (± 0.5°C)
Timing:
Backlight Operation: 10 seconds
Terminations:
L, N, Heat, Cool, FH, FM, FL, PS, RS, SB, SC
Package Contents/Tools Required
Package includes:
SC900V
thermostat on base, thermostat cover, wiring labels, screws and wall
anchors, Installation, Operation and Application Guide
Tools required for installation:
Drill with 3/16” bit, hammer, screwdriver
1. Turn off power to the heating and cooling system by removing the fuse or switching the appropriate circuit breaker off.
2. Remove cover of old thermostat. This should expose the wires.
3. Label the existing wires with the enclosed wire labels before removing wires.
4. After labeling wires, remove wires from wire terminals or remove wire nuts.
5. Remove existing thermostat base from wall.
6. Refer to the following section for instructions on how to install this thermostat.
To Remove Existing Thermostat
ELECTRICAL SHOCK HAZARD
– Turn off power at the main service panel by removing the fuse or switching the appropriate circuit breaker to the OFF position before removing the existing
thermostat.
Important Safety Information
WARNING!
:
Always turn off power at the main power supply before installing, cleaning,
or removing thermostat.
• This thermostat is for 24-277 VAC applications only; do not use on voltages over 277 VAC
• Use this thermostat only as described in this manual
ELECTRICAL SHOCK HAZARD
– Turn off power at the main service panel by removing
the fuse or switching the appropriate circuit breaker to the OFF position before working
on a high voltage thermostat.
Wire Designator Descriptions
L – 120 VAC Hot
Black
N – 120 VAC Neutral
White
H – Heat
Red
C – Cool
Blue
FH – Fan High
Purple
FM – Fan Medium
Yellow
FL – Fan Low
Gray
PS – Pipe Sensor (optional)
Orange/White
RS – Remote Sensor (optional)
Red/White
SB – Set Back (optional)
White/Black
SC – Set Back/Sensor Common
Blue/White
Configuration Mode
The configuration mode is used to set the
SC900V
to match your heating/cooling system.
To configure the
SC900V
, perform the following steps:
1. Verify the
SC900V
is in the
OFF
mode. Press the
SYS
(left) button until off mode displays.
2. Press the
PROG
button for 5 seconds while the
SC900V
is in
OFF
mode.
Press the
up
or
down
button to change settings within each screen.
Press the
PROG
button to advance to the next screen.
Note:
Pressing the
SYS
button will return you to the previous screen.
To exit configuration mode, press the
PROG
switch for 5 seconds.
FAN
SYS
PROG
Down
button
Up
button
Icon Descriptions
Cooling operation icon
Heating operation icon
COOL
HEAT
Fan
Auto
Fan
operation
icon
Wiring Diagrams
System 1
Heat Only
N
H
C
FH
FM
FL
PS
SB
SC
RS
L
Remote Sensor
Pipe Sensor
Set Back
Fan High
Heat
Fan Low
(
Optional
)
(
Optional
)
(
Optional
)
Purple
Yellow
Gray
Orange/White
Red/White
White/Black
Blue/White
Blue/White
Blue/White
Blue/White
Blue/White
Blue/White
Blue/White
Red
White
Black
24-277
VAC
Fan Medium
System 2
Cool Only
N
H
C
FH
FM
FL
PS
SB
SC
RS
L
Remote Sensor
Pipe Sensor
Set Back
Fan High
Cool
Fan Low
(
Optional
)
(
Optional
)
(
Optional
)
Purple
Yellow
Gray
Orange/White
Red/White
White/Black
Blue
White
Black
24-277
VAC
Fan Medium
System 3
2-Pipe Manual Changeover
N
H
C
FH
FM
FL
PS
SB
SC
RS
L
Remote Sensor
Pipe Sensor
Set Back
Fan High
Heat/Cool
Fan Low
(
Optional
)
(
Optional
)
(
Optional
)
Purple
Yellow
Gray
Orange/White
Red/White
White/Black
Red
White
Black
24-277
VAC
Fan Medium
System 4
2-Pipe Seasonal Changeover
N
H
C
FH
FM
FL
PS
SB
SC
RS
L
Remote Sensor
Pipe Sensor
Set Back
Fan High
Heat/Cool
Fan Low
(
Optional
)
(
Required
)
(
Optional
)
Purple
Yellow
Gray
Orange/White
Red/White
White/Black
Red
White
Black
24-277
VAC
Fan Medium
System 5
2-Pipe Manual Changeover
with Auxiliary
N
H
C
FH
FM
FL
PS
SB
SC
RS
L
Remote Sensor
Pipe Sensor
Set Back
Fan High
Auxiliary
Heat/Cool
Fan Low
(
Optional
)
(
Required
)
(
Optional
)
Purple
Yellow
Gray
Orange/White
Red/White
White/Black
Blue
Red
White
Black
24-277
VAC
Fan Medium
System 7
4-Pipe Auto Changeover
N
H
C
FH
FM
FL
PS
SB
SC
RS
L
Remote Sensor
Set Back
Fan High
Cool
Heat
Fan Low
(
Optional
)
(
Optional
)
Purple
Yellow
Gray
Red/White
White/Black
Blue
Red
White
Black
24-277
VAC
Fan Medium
System 6
4-Pipe Manual Changeover
N
H
C
FH
FM
FL
PS
SB
SC
RS
L
Remote Sensor
Set Back
Fan High
Cool
Heat
Fan Low
(
Optional
)
(
Optional
)
Purple
Yellow
Gray
Red/White
White/Black
Blue
Red
White
Black
24-277
VAC
Fan Medium
To Install Thermostat
ELECTRICAL SHOCK HAZARD
– Turn off power at the main service panel by removing the fuse or switching the appropriate circuit breaker to the OFF position before removing the existing
thermostat.
IMPORTANT:
Thermostat installation must conform to local and national building and electrical codes and ordinances.
Note:
Mount the thermostat about five feet above the floor. Do not mount the thermostat on an outside wall, in direct sunlight, behind a door, or in an area affected by a vent or duct.
1. Turn off power by removing the fuse or switching the appropriate circuit breaker off.
2. To remove cover, remove screw and pull gently at the seam at the top.
3. Set thermostat away from working area.
4. Align thermostat base with junction box mounting holes and feed the control wires through hole.
5. Use supplied screws to mount thermostat base to junction box.
CAUTION!
:
Be sure exposed portion of wires does not touch other wires.
6. Wire nut the thermostat wires to your system wires.
7. Gently tug wire to be sure of proper connection. Double check that each wire is connected to the
proper terminal.
8. Snap thermostat to base that is mounted on the wall. Refasten with screw.
9. Turn on power to the system at the main service panel.
10. Test thermostat operation as described in “Testing the Thermostat”.
Configuration Mode Settings
1 – System
Select the type of operation you require.
1. Heat Only is for a system with only heating.
2. Cool Only is for a system with only cooling.
3. 2-Pipe Manual Changeover is for a 2 pipe system that handles both heating and cooling. The user
selects whether the system will be set to heating or set to cooling.
4. 2-Pipe Seasonal Changeover is for a 2 pipe system that handles both heating and cooling. The
thermostat selects whether the system will be set to heat or set to cool based on the pipe sensor
temperature.
5. 2-Pipe Manual Changeover with Auxiliary is for a 2 pipe system that handles both heating and
cooling. The user selects whether the system will be set to heat or set to cool. If set to heat and the
pipe sensor indicates there is not heat, the auxiliary output will be turned on.
6. 4-Pipe Manual Changeover is for a 4 pipe system. The user selects whether the system will be set
to heat, cool or off.
7. 4-Pipe Auto Changeover is for a 4 pipe system. The user selects whether the system will be set to
heat, cool, heat & cool or off.
“1” Heat only
“2” Cool only
“3” 2-pipe manual changeover
“4” 2-pipe seasonal changeover
2 – Temperature Scale
This thermostat can function in Fahrenheit and Celsius.
F = Fahrenheit (
Default)
C = Celsius
3 – Valve Type
This thermostat operates with Normally Open or Normally Closed valves. Select the correct valve
type for your system.
no = Normally Open (
Default)
nc = Normally Closed
“5” 2-pipe seasonal changeover w auxiliary
“6” 4-pipe manual changeover
“7” 4-pipe auto changeover (
Default)
4 – Temperature Sensor
Select the type of room temperature sensor you are using.
o = Onboard temperature sensor (
Default)
r = Remote temperature sensor
5 – Fan Operation
Select either Automatic Fan or Continuous Fan.
Automatic Fan will automatically adjust the fan speed (Low, Medium, High) based on the set point
and room temperature. The more the room temperature is from the set point the faster the fan will
operate. The fan will be off in OFF mode.
Continuous Fan will run the fan at the fan speed that is selected with the FAN button. It can be
turned OFF only when in OFF mode.
A = Automatic Fan (
Default)
C = Continuous Fan
