3
TROUBLE SHOOTING TESTS (4-Pipe System)
Voltage:
When using a voltmeter across "White" and "Black", the
voltage must be 120VAC.
To Check Continuity:
(Using a Voltmeter with all loads connected)
A)
When thermostat is calling for Cooling, meter should read
120VAC from "White" to "Blue". When Cooling is deactivated,
meter should read 0VAC from "White" to "Blue".
B)
When thermostat is calling for Heating, meter should read
120VAC from "White" to "Red". When Heating is deactivated,
meter should read 0VAC from "White" to "Red".
C)
When thermostat is calling for High fan, meter should read
120VAC from “White” to “Yellow w/Red Stripe”. When High fan is
deactivated, meter should read 0VAC from “White” to “Yellow
w/Red Stripe”.
D)
When thermostat is calling for Low fan, meter should read
120VAC from “White” to “Yellow”. When Low fan is deactivated
meter should read 0VAC from “White” to “Yellow”.
Adjust setpoint as follows:
4°F (2°C) or more ABOVE room temperature
2°F to 4°F (1°C to 2°C) ABOVE room temperature
Within 0°F to 2°F (0°C to 1°C) of room temperature
2°F to 4°F (1°C to 2°C) BELOW room temperature
4°F (2°C) or more BELOW room temperature
Function Test:
HIGH
Lo
Hi
Hi
Lo
Lo
Hi
Lo
Hi
Lo
Lo
Hi
Lo
Hi
Hi
On
On
LOW
AUTO
COOL
HEAT
FAN SPEED
SYSTEM
On
On
Stop
(Dead band)*
*Deadband: Active on start-up or initial call for heating or cooling
From the wire chart found above, assign, according to function, the
cable wire colors to the thermostat wire legend provided below. If this
is a new installation, record the cable wire colors in the thermostat
legend provided below.
Note:
There is no medium fan in the thermostat. The wire for the
medium fan needs to be tied off following standard procedures, unless
used as a neutral.
See Figure 1.
2-Pipe Fan Coil Installation:
Follow the instructions for a 4-Pipe installation with the following
exceptions.
NOTE:
Fan will cycle only with calls for heating or cooling.
Continuous fan is not available on 2-pipe systems.
Old thermostat
wire function
Power Feed
Load Feed
Neutral
Heat
Cool
Low Fan
Medium Fan
High Fan
Cable
wire color
New thermostat
wire function
Control Feed
Load Feed
Neutral
Heat
Cool
Low Fan
High Fan
New thermostat
wire color
Black
Orange
White
Red
Blue
Yellow
Yellow w/Red Stripe
Cable
wire color
Diagnostic mode can be deactivated by
changing the °F/°C slide switch.
ECON
Economy Mode
Display
°F/°C
Diagnostic Mode:
Press and hold the "up" and "down" buttons
together until "DIAG" appears on the display.
Release the buttons.
°F/°C
AUTO
DIAG
◦
Diagnostic mode will alternately display setpoint
and room temperature every 5 seconds.
The setpoint temperature is displayed with
"SETPOINT"
°F/°C
Current Setpoint
Display
AUTO
DIAG
◦
SETPOINT
The room temperature is displayed with °F and
"ROOM". Both setpoint and room temperature
displays will indicate the fan speed activity and
"DIAG".
°F/°C
Room Temperature
Display
ROOM
AUTO
DIAG
◦
Aquastat (mounted on water
supply line) or season change
switch
Wiring Diagram 2-pipe Fan Coil
Yellow LOW
Red
Black
White
Yellow w/red stripe HIGH
Blue
Valve
Line
Neutral
120VAC
Orange
Fan
Note: Fan will cycle with
heat or cool only
Cool pipe
position
Hot pipe
position
Black
Control
Feed
Door Switch, Motion Detector Wiring Diagram 2-pipe Fan Coil
Yellow LOW
Blue COOL
Red HEAT
White
Yellow w/red stripe HIGH
Orange
Valve
Line
Neutral
120VAC
Fan
Motor
Door switch or motion detector control relay
must have a minimum of 10A inductive load
rating. In open position fan and valves will be
deactivated. In closed position fan and valves
will be activated.
Aquastat (mounted on water supply line)
or season change switch
