Peco T158, TA158 Installation Instructions Manual

INSTALLATION INSTRUCTIONS

1. Install the T158 with the two furnished mounting screws to a
standard 4-11/16" x 2-1/8" square device box with a 2" x 4"
adapter ring.

2. For wall installations, mount the thermostat on an inside wall
approximately 5 feet above the floor. The location should
provide circulation at average room temperature. Avoid direct
sunlight or sources of hot or cold air in the room or wall.

3. Remove the cover. Mount thermostat base assembly to the
outlet box using the screws provided, tighten the screws evenly
but do not over tighten. Connect wires as shown in the
appropriate wiring diagram for your thermostat style.

4. To use a remote sensor on units with local sensing capability,
remove jumper JP-1 to disable local sensing. Failure to remove
JP-1 will cause improper operation of the thermostat.

5. Remove the LCD plastic protective film. Reinstall the cover
assembly. Install the cover locking screw provided in the hole at
the left side of the control enclosure to complete the installation.

6. Checkout: After wiring and installation are complete, energize
the system and check the operation. Adjust the thermostat as
necessary to complete at least one cycle. Be sure the
thermostat and all other equipment are functioning correctly.

CAUTION

TA158

MICROPROCESSOR THERMOSTAT

On/Off Controller

WARNING

hREAD THESE INSTRUCTIONS CAREFULLY BEFORE

ATTEMPTING TO INSTALL, OPERATE OR SERVICE
THIS THERMOSTAT.

hFailure to observe safety information and comply with

instructions could result in PERSONAL INJURY, DEATH
AND/OR PROPERTY DAMAGE.

hTo avoid electrical shock or damage to equipment,

disconnect power before installing or servicing.

hTo avoid potential fire and/ or explosion do not use in

potentially flammable or explosive atmospheres.

hRetain these instructions for future reference. This

product, when installed, will be part of an engineered
system whose specifications and performance
characteristics are not designed or controlled by PECO.
You must review your application and national and local
codes to assure that your installation will be functional and
safe.

hUse copper wire only, insulate or wire nut all un-used

leads.

hCare should be used to avoid electrostatic discharge to

the microprocessor.

hThis unit has configuration jumpers. You may need to re-

configure this thermostat for your application.
See page 2.

1

2

3

4

LINE VOLTAGE

CONNECTIONS

5

6

7

10

11

12

13

14

15

LOW VOLTAGE

CONNECTIONS

16

17

L1 (HOT)

LO

MED

HIGH

OR SINGLE SPEED FAN

24 VAC 1

24 VAC 2

SETBACK INPUT

MAIN 1

SEC 1

SECONDARY

1 OUTPUT

L2 OR NEUTRAL

FAN

MAIN 1

OUTPUT

REMOTE PROBE

PIPE SENSOR

VOLTAGE

RATING

24 VAC

120 VAC

240 VAC

277 VAC

24 VAC
XFMR

FAN AND SYSTEM SWITCHES

INDUCTIVE

FLA

NA NA NA 24 VA

5.8 34.8 6.0 125 VA

2.9 17.4 5.0 125 VA

2.4 14.4 4.2 125 VA

LRA

RESISTIVE

AMPS

PILOT
DUTY

THERMOSTATIC

SWITCHING

(Pilot Duty)

10 VA

N.A.

N.A.

N.A.

TA158 OPERATION

Off at

N/A

N/A

ON - OFF

On With Demand

Temperature

Summer: On With

Heat Demand

Winter: Disabled

On at

Demand

N/A

N/A

OUTPUT

Off With Demand

MAIN 1

(Terminal 10)

MAIN 2

(Terminal 12)

SECONDARY

1

(Terminal 11)

SECONDARY

2

(Terminal 13)

* Operation is determined by configuration. See Dip Switch Configuration Table.

Temperature

Demand

Summer: Off With

Heat Demand

Winter: Disabled

WIRING DIAGRAM FOR ON/OFF OUTPUT

CONFIGURATION

© COPYRIGHT 2005 PECO, INC. ALL RIGHTS RESERVED P/N 68837 3220-1470 Rev 0 Page 1

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.

DIP SWITCH CONFIGURATION

SECONDARY 1 OFF WITH DEMAND

MAIN 1 OFF WITH DEMAND

CENTIGRADE DISPLAY

OPERATING POSITION

OPERATING POSITION

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.

AUTO

ON

10 11 12 13

11 22 33 44 55 66

SECONDARY 1 ON WITH DEMAND

MAIN 1 ON WITH DEMAND

FAHRENHEIT DISPLAY

N/A

N/A

90 F/ 50 F SETBACK

DIP SWITCH

JP4

15 16 17

5 6 7

ON

1

2 3

4 5 6

1 2 3 4

JP1

CIRCUIT BOARD JUMPER CONFIGURATION

Jumper

Designation

JP1

JP4

* 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. The set point and operating mode will be retained on a
loss of power.

4. When using either a remote probe or pipe sensor, run
wiring away from any electrical motors or power wiring.

Jumper Installed

ON

Local Sensing

2 Pipe System*

Jumper Removed

OFF

Remote Sensing

4 Pipe System

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 Range Default

1 Zone Temp Offset -5.1F to 5.1F 0F
2 Valve Stroke Time 30 sec. To 5 min. 120 sec.
3 Fan Delay to OFF 0 to 10 Minutes 0 Sec.
4 Compressor

30 Sec. To 10 min. 120 Sec.

Minimum Off Time

5 Purge Cycle 0 = Time Based

1 = Temperature Based

For more information see: www.pecomanufacturing.com

© COPYRIGHT 2005 PECO, INC. ALL RIGHTS RESERVED P/N 68837 3220-1471 Rev 0 Page 2

Power-Up Operating Sequence

Upon application of power, a TA158 will go directly to
normal operation.

1