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THERMOSTAT OPERATION
These thermostats are designed to control On-Off, N.O. and N.C.
valves, relays and Erie® three wire floating valves. These units may
include a fan switch with one or more fan speed selections.
MODE BUTTON OPERATION
OFF
All thermostat outputs are off, fan is still operational if
connected to manual fan speed switch.
AUTO
The thermostat automatically selects heating or cooling
mode depending on the set point and room temperature. The
appropriate HEAT or COOL indicator is enabled in addition to AUTO. A
3°F dead-band is provided to prevent short cycling between heating
and cooling modes. After change-over the control points automatically
shift so that the heating off point or the cooling off point equals the set
point temperature.
COOL
The thermostat operates as a cooling only thermostat. The
heating outputs are disabled.
HEAT
The thermostat operates as a heating only thermostat. The
cooling outputs are disabled.
If constructed without a mode button, the thermostat operates in Auto
mode, subject to configuration of the 2/4 pipe jumper and pipe sensor
input.
FAN SPEED SWITCH OPERATION
Fan speed is determined by manual selection from fan switch OFF to
HIGH, MEDIUM and/ or LOW. In units with the Cycling Fan Option
(demand output), the Fan operation (CYCLING vs. CONTINUOUS) is
determined by application connections. In OFF position all outputs are
off and display blank.
UP/ DOWN ARROW OPERATION
A first touch of either arrow will display the set point (a single set point is
employed for both heating and cooling). Continued pressure on either
arrow will scroll the set point to new values. After three seconds with no
pressure on either arrow, the selected set point becomes effective and
the display of the room temperature resumes.
SETBACK OPERATION
Connection of the Setback Input to 24 VAC 1 will force the control into
un-occupied mode (see wiring diagram). Pressing an arrow key or the
mode button on the thermostat cover will disable the setback input for
one hour.
PIPE SENSOR OPERATION
If cold water is detected, the system will operate in summer mode and
the Main output will be cooling. If hot water is detected, the system will
operate in winter mode, the Main output will be heating and First Stage
Secondary Output will be disabled. In the case of an ambiguous
reading, neither hot or cold, the thermostat will initiate a purge cycle.
THREE WIRE FLOATING VALVE OPERATION
Open and Close outputs are used to position the valve. Stroke time is
factory set at two minutes. Outputs are off after reaching full on or off
position. Valves are periodically reset for accuracy.
OUTSIDE AIR DAMPER OPERATION
This output is ON any time the control is turned ON.
MAIN AND SECONDARY OUTPUT OPERATION
Three Wire
OUTPUT
Floating Operation
MAIN 1
Powers Main
(Terminal 10)
Valve Open
MAIN 2
Powers Main
(Terminal 12)
Valve Closed
SECONDARY 1
Powers Secondary
(Terminal 11)
Valve Open
SECONDARY 2
Powers Secondary
(Terminal 13)
Valve Closed
* Operation is determined by configuration. See Dip Switch Configuration Table.
For more information see: www.pecomanufacturing.com
© COPYRIGHT 2005 PECO, INC. ALL RIGHTS RESERVED
ON - OFF
Off With Demand
On With Demand
Off at Temperature
On at Temperature
Demand
Demand
Cycles On
Cycles On
With Demand
With Demand
Summer: Off With
Summer: On With
Heat Demand
Heat Demand
Winter: Disabled
Winter: Disabled
On at Second Stage
On at Second Stage
Heating Demand
Heating Demand
DIP SWITCH CONFIGURATION
SECONDARY 1 OFF WITH DEMAND
MAIN 1 OFF WITH DEMAND
CENTIGRADE DISPLAY
SECONDARY ON-OFF
MAIN ON OFF
85 F/ 60 F SETBACK
Example: This Dip Switch Is Configured For On With Demand, °F Display, On-
Off Operation And 90/50 F Setback.
NOTE: Thermostat power must be cycled for changes in dip switch configuration
to take effect.
DIP SWITCH
AUTO
10 11 12 13
CIRCUIT BOARD JUMPER CONFIGURATION
Jumper
Jumper Installed
Designation
JP1
Local Sensing
JP4
2 Pipe System*
* Disables the Secondary 1 Output
Application Notes
1. When no pipe sensor is used the main output controls
cooling and the secondary output controls heating.
2. The pipe sensor should be mounted on the main coil input
for water system operation and in the main duct system for
forced air operation.
3. Set point and operating mode are retained on power loss.
4. When using either a remote probe or pipe sensor, run
wiring away from any electrical motors or power wiring.
5. For three-wire floating applications you must configure
stroke time. Factory default is 2-minutes.
Power-Up Operating Sequence
For ON-OFF configuration, this thermostat will go directly to
normal operation.
For three-wire floating configuration (TB158),thermostat will
operate as follows:
1. Close both the main and secondary valves for a period of
three minutes (default) by applying power to the Main 2 and
Secondary 2 outputs (stroke time can be changed).
2. At the end of three minutes, the TB158 will stop closing the
valves by removing power from the Main 2 and Secondary 2
outputs.
3. The TB158 will go to normal operation based on demand,
system configuration (summer/winter, 2 or 4 pipe) and mode
button selection.
Service Menu:
Access: Press UP and DOWN arrows for 5 seconds.
Menu Selection: Select 1 to 5 by pressing the mode button
or by pressing the UP and DOWN arrows simultaneously.
Adjust Value: Use UP or DOWN arrow.
Item #
Function
1
Zone Temp Offset
2
Valve Stroke Time
3
Fan Delay to OFF
4
Compressor
Minimum Off Time
5
Purge Cycle
P/N 68838 3220-1473 Rev 0
ON
SECONDARY 1 ON WITH DEMAND
MAIN 1 ON WITH DEMAND
FAHRENHEIT DISPLAY
SECONDARY 3-WIRE FLOATING
MAIN 3-WIRE FLOATING
90 F/ 50 F SETBACK
ON
JP4
15 16 17
Jumper Removed
ON
OFF
Remote Sensing
4 Pipe System
Range
Default
-5.1F to 5.1F
0F
30 sec. To 5 min.
120 sec.
0 to 10 Minutes
0 Sec.
30 Sec. To 10 min.
120 Sec.
0 = Time Based
1
1 = Temperature Based
Page 2
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