Johnson Controls T600MEP-2 Installation Instructions Manual

Installation Instructions
Issue Date January 19, 2005

T600MEP-2 Programmable Economizer Thermostat

Application

The T600MEP-2 is a programmable thermostat for
control of single- or two-stage unitary rooftop units with
economizers. The T600MEP-2 thermostat provides
exceptional accuracy through the use of a unique
Proportional-Integral (PI) time proportioning algorithm.
The algorithm virtually eliminates temperature offset
associated with traditional, differential-based on/off
thermostats. The T600MEP-2 also uses an adaptive
control logic algorithm to control the space
temperature during recovery to minimize overshoot
while providing maximum comfort. Economizer
functions include a 0 to 10 VDC control signal, dry bulb
changeover strategy, adjustable minimum position,
and mixed air setpoint control. Additionally, the menu
driven backlit display, plain text menus, and five keys
on the T600MEP-2 make programming the thermostat
easy and intuitive.

Installation

Location Considerations

Locate the T600MEP-2 thermostat:

• on a partitioning interior wall, and approximately
5 ft. (1.5 m) above the floor in a location of
average temperature

• away from direct sunlight, radiant heat, outside
walls, behind doors, air discharge grills, stairwells,
or outside doors

• away from steam or water pipes, warm air stacks,
unheated/uncooled areas, or sources of electrical
interference

To install the thermostat:

1. Remove the security screw on the bottom of the
thermostat cover using a Phillips-head
screwdriver. Open the thermostat by pulling on
the bottom side of the thermostat cover
(Figure 1).

2. Unlock the Printed Circuit Board (PCB) by
carefully pressing the locking tabs to the right
(Figure 2). Open the thermostat’s PCB to the left.

3. Pull out approximately 6 in. (152 mm) of wires
from the wall and insert the cable through the
hole in the base.

4. Align the base on the wall, and using the base as
a template, mark the location of the two mounting
holes on the wall. Confirm the thermostat base is
installed with the proper side up.

5. Use the supplied anchors and screws for
mounting on drywall or plaster. Drill two 3/16 in.
(4.7 mm) holes at the marked locations and tap
nylon anchors flush to wall surface (Figure 3).

6. Position base on the wall, insert screws through
mounting base, and fasten into wall anchors. Do
not overtighten screws.

7. Swing the thermostat PCB back to the right to
close. Gently press on the PCB to secure each of
the locking tabs.

8. Pull out the screw terminal blocks using the
pull-tabs on each connector (Figure 4).

Note: The number of terminals on the terminal
blocks varies depending on the T600 model.

© 2005 Johnson Controls, Inc.
Part No. 24-9889-150, Rev. A www.johnsoncontrols.com

1

IMPORTANT: Use this T600MEP-2

programmable economizer thermostat only as an
operating control. Where failure or malfunction of the
thermostat could lead to personal injury or property
damage to the controlled equipment or other
property, additional precautions must be designed
into the system. Incorporate and maintain other
devices such as supervisory or alarm systems or
safety or limit controls intended to warn of, or protect
against, failure or malfunction of the thermostat.

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Figure 1: Removing the Thermostat Cover

Wiring

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Figure 4: Removing the Terminal Blocks

PCB

LockingTabs

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Figure 2: Opening the Thermostat PCB

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Figure 3: Mounting the Thermostat Base

!

CAUTION: Risk of Electric Shock.
Disconnect power supply before making electrical
connections to avoid electric shock.

Note: When replacing an existing thermostat,
remove and label wires to identify terminal
designations. When replacing a T600MEP thermostat,
simply remove the terminal blocks and reinsert on to
the new thermostat.

To wire the thermostat:

1. Strip each wire 1/4 in. (6.35 mm) and connect to
the appropriate terminal according to the wiring
diagram (see Figure 5).

2. Gently push excess wire back into wall, plug the
wall hole with fireproof material to prevent drafts
from affecting ambient temperature readings, and
install screw terminal blocks back onto the PCB.

3. Reattach the thermostat cover to the installed
base (top side first) and install the security screw
on the bottom.

!

CAUTION: Risk of Property Damage.

Do not apply power to the system before checking
all wiring connections. Short circuited or improperly
connected wires may result in permanent damage to
the equipment.

2 T600MEP-2 Programmable Economizer Thermostat Installation Instructions

Terminal

Y1
Y2

RC

RH
W1
W2

AUX

D1
D2

RS

Scom

OS
MS
EC

Y2 Y1

Cool 2

Cool 2

Energizes on a call for first stage cooling
Energi zes on a call for se cond stage cooling

G

Energi zes fan in accor dance with th e selected fa n m ode
24 VAC from equipment transformer

C

24 VAC (com m on) from eq ui pment transformer
24 VAC for h eat ing stages
Energizes on a call for first stage heating
Energi zes on a call for se cond stage heating
Config ur able auxiliar y output
Config ur able digit al input
Config ur able digit al input
Remote room sensor
Sensor common
Outdoor air sensor
Mixed ai r s ensor
0 - 10 VDC Economizer actuator output

GRCC

Cool 1

Fan

24 VAC

Thermostat Power

Function

5 pole left to p connecto r

Y1 G RC

Y2

8 pole bottom connector

EC

AUX

RH W1

Heat 1

W2

Heat 2

EC

D1

D2

AUX

0
1

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0

Aux

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2

C

RS

Scom

Remote

If using the same power source
for the the r m ostat and heating

Room

Sensor

loads, install a jumper
across RC and RH.

Figure 5: T600MEP-2 Thermostat Wiring Schematic

D1 D2 RS

OS

Remote
Outdoor

Sensor

3 pole right top
connector

C

RH W1 W2

Scom

Remote

Mixed Air

Sensor

OS

MS

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T600MEP-2 Programmable Economizer Thermostat Installation Instructions 3

Setup and Adjustments

Thermostat Operation Overview

Backlit, plain text, Liquid
Crystal Display (LCD)
is easy to read in any
condition.

Five keys on the T600
make operation easy
and intuitive.

Figure 6: T600MEP-2 Thermostat Front Cover

Thermostat Interface Keys

The T600MEP-2 interface consists of five keys on
the front cover and one configuration key
(Figure 7) that are accessed by removing the front
cover. Use the:

• YES/SCROLL key to:

− confirm menu selections, and to advance to

the next menu item

− stop the Status Display Menu from scrolling
and to manually scroll to the next parameter
on the menu. When left unattended for
45 seconds, the display resumes scrolling.

• NO key when you do not desire a parameter
change, and to advance to the next menu item

• MENU key to access the Main User Menu or exit
the menu

• UP/DOWN arrow keys to:

− adjust values

− activate a Temporary Setpoint

Backlit Liquid Crystal Display (LCD)

The T600MEP-2 uses a two-line, eight-character
display. Low-level backlighting is present during
normal operation, and it brightens when any user
interface key is pressed. The backlight returns to the
lower level when the thermostat is left unattended for
45 seconds.

Room Temp

75.0ºF

Light Emi t ting Diodes (L E Ds)
indicate system activi t y.

T600_TEC_Front_Cover

Configuration

Key

T600_TEC_Config_Key

Figure 7: Configuration Key Location

Light-Emitting Diodes (LEDs)

Three LEDs are used to indicate the status of the fan,
call for heat, or call for cooling. When:

• the fan is on, the FAN LED lights up

• heating is on, the HEAT LED lights up

• cooling is on, the COOL LED lights up

Programming Overview

There are three menus used to view, program, and
configure the T600MEP-2 thermostat: Status Display,
Main User, and Installer Configuration Menus.

The Status Display Menu is displayed during normal
thermostat operation. The menu continually scrolls
through the following parameters:

• Room Temperature

• Day and Time

• System Mode

4 T600MEP-2 Programmable Economizer Thermostat Installation Instructions

• Schedule Status (Occupied/Unoccupied)

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• Outdoor Temperature (providing sensor is
connected and functional)

• Applicable Alarms (The backlight lights up and an
alarm condition is displayed.)

To temporarily stop the scrolling, press the
YES/SCROLL key.

The Main User Menu is used to access and change
the thermostat’s basic operating parameters. Access
the menu by pressing the MENU key during normal
thermostat operation.

The Installer Configuration Menu is used to set up
the thermostat for application specific operation.
Access the menu by removing the front cover and
pressing the configuration key, labeled CONFIG
(Figure 7).

Configuring the T600MEP-2

The T600MEP-2 ships from the factory with default
settings for all configurable parameters. The default
settings are shown in Table 1. To reconfigure the
parameters, follow the steps in this section for the
corresponding parameters. The parameters must be
set up by accessing the Installer Configuration Menu.
Access the Installer Configuration Menu by removing
the front cover and pressing the configuration key
(Figure 7).

Exit the Installer Configuration Menu any time by
pressing the MENU key and, at the exit prompt,
pressing the YES key. To pass over a parameter
without changing it, press the NO key.

When the thermostat is in the Installer Configuration
Menu and left unattended for 45 seconds, it reverts to
the Status Display Menu.

Table 1: Installer Configuration Menu

RoomTemp

75.0 °F

DI1
set? Y/N

DI2
set? Y/N

Remove the cover and press the
CONFIG key from the Status Display
Menu to enter the Installer
Configuration Menu.

Configures Digital Input 1
Default: No Function (None)
See the Configuring the Digital Inputs
(DI1 and DI2) section.

Configures Digital Input 2
Default: No Function (None)
See the Configuring the Digital Inputs
(DI1 and DI2) section.

Lockout
set? Y/N

Pwr del
set? Y/N

Frost p
set? Y/N

Heat max
set? Y/N

Cool min
set? Y/N

nticycl

set? Y/N

Heat cph
set? Y/N

Cool cph
set? Y/N

Deadband
set? Y/N

Fan cont
set? Y/N

Fan del

set? Y/N

Continued on the next page . . .

Sets Keypad Lockout Level
Default: No Lockout (0)
See the Enabling Keypad Lockout
(Lockout) section.

Sets Power-up Delay
Default: Ten Seconds (10.0 sec)
See the Setting the Power-up Delay
(Pwr del) section.

Enables/Disables Frost Protection
Default: Disabled (Off)
See the Enabling Frost Protection
(Frost pr) section.

Sets the Maximum Heating Setpoint
Default: 90.0°F (32.0°C)
See the Setting the Maximum Heating
Setpoint (Heat max) section.

Sets the Minimum Cooling Setpoint
Default: 54.0°F (12.0°C)
See the Setting the Minimum Cooling
Setpoint (Cool min) section.

Sets the Anti-short Cycle Timer
Default: Two Minutes (2.0 min)
See the Setting the Anti-Short Cycle
Timer (Anticycl) section.

Sets the Maximum Heating Cycles per
Hour
Default: Four (4.0)
See the Setting the Maximum Heating
Cycles per Hour (Heat cph) section.

Sets the Maximum Cooling Cycles per
Hour
Default: Four (4.0)
See the Setting the Maximum Cooling
Cycles per Hour (Cool cph) section.

Sets the Minimum Heating/Cooling
Deadband
Default: 2.0°F (1.1°C)
See the Setting the Heating/Cooling
Deadband (Deadband) section.

Determines how the Fan Activates in
Response to a call for Heat
Default: Thermostat Controls Fan (On)
See the Setting the Fan Control (Fan
cont) section.

Delays Fan Termination at Cycle’s End
for 60 Seconds
Default: No Delay (Off)
See the Setting the Fan Delay (Fan
del) section.

T600MEP-2 Programmable Economizer Thermostat Installation Instructions 5

Table 1: Installer Configuration Menu (Cont.)

TOccTime
set? Y/N

Cal RS
set? Y/N

Cal OS
set? Y/N

H Stage
set? Y/N

C Stage
set? Y/N

H lock
set? Y/N

C lock
set? Y/N

2/4event
set? Y/N

Aux cont
set? Y/N

Prog Rec
set? Y/N

Chngstpt
set? Y/N

Sets the Duration for Temporary
Occupancy Time
Default: Three Hours (3.0 hrs)
See the Establishing the Temporary
Occupancy Time (TOccTime) section.

Room Air Sensor Calibration (Offset)
Default: 0.0°F (0.0°C)
See the Room Air Sensor Calibration
(Cal RS) section.

Outdoor Air Sensor Calibration (Offset)
Default: 0.0°F (0.0°C)
See the Outdoor Air Sensor
Calibration (Cal OS) section.

Enable/Disable Second Heating Stage
Default: Two Stages
See the Enable/Disable Second
Heating Stage (H Stage) section.

Enable/Disable Second Cooling Stage
Default: Two Stages
See the Enable/Disable Second
Cooling Stage (C Stage) section.

Disables Heating Operation based on
Outdoor Air Temperature
Default: 120°F (49°C)
See the Setting the Heating Lockout
(H lock) section.

Disables Cooling Operation based on
Outdoor Air Temperature
Default: -40°F (-40°C)
See the Setting the Cooling Lockout
(C lock) section.

Sets the Number of Events in 24-Hour
Period
Default: Two Events (2.0)
See the Selecting the Number of
Events (2/4event) section.

Sets the Auxiliary Contact as Normally
Open or Normally Closed
Default: Normally Open (N.O.)
See the Configuring the Auxiliary
Contact (Aux cont) section.

Enable/Disable Progressive Recovery
Default: Off
See the Enable/Disable Progressive
Recovery (Prog Rec) section.

Sets the Economizer Changeover
Temperature
Default: 55°F (13°C)
See the Setting the Economizer

Changeover Temperature (Chngstpt)

section.

Min pos
set? Y/N

C mech
set? Y/N

Mix stpt
set? Y/N

Display
MS? Y/N

Sets the Outdoor Air Damper Minimum
Position
Default: 0%
See the Setting the Outdoor Air

Damper Minimum Position (Min pos).

section.
Sets the Mechanical Cooling Mode

Default: Off
See the Setting the Mechanical
Cooling Mode (C mech) section.

Sets the Mixed Air Temperature
Setpoint
Default: 55°F (13°C)
See the Setting the Mixed Air

Temperature Setpoint (Mix stpt)

section.
Displays the Mixed Air Temperature

Default: None
See the Displaying the Mixed Air
Temperature (Display) section.

Configuring the Digital Inputs (DI1 and DI2)

Press the configuration menu access key. The first
prompt is to program Digital Inputs DI1 and DI2.

The digital inputs display an alarm condition when the
input is closed. An alarm message is included on the
scrolling Status Display Menu and when the message
is displayed, the backlight momentarily lights up.

Each digital input can be programmed in one of five
conditions.

• None – No function is associated with the input.

• Service – A Service alarm is displayed.

• Filter – A Filter alarm is displayed.

• RemNSB – Remote Night Setback (NSB) timer

clock input. The scheduling is set per the digital
input when this option is selected. The time
continues to be displayed, but the menu related to
scheduling is disabled and no longer accessible.

− Open Contact = Occupied setpoints

− Closed Contacts = Unoccupied setpoints

• RemOVR – Remote override contact. This

disables all override menu functions of the
thermostat. The override function is controlled
manually by a remote, momentarily closed
contact. When configured in this mode, the input
operates in a toggle mode. With this function
enabled, it is now possible to toggle between
unoccupied and occupied setpoints for the amount
of time set by the temporary occupancy time
parameter.

6 T600MEP-2 Programmable Economizer Thermostat Installation Instructions

When override is enabled through the digital
inputs, an Override message appears in the
Status Display Menu.

To configure the digital inputs while in the Installer
Configuration Menu:

1. Press YES to configure Digital Input 1 or NO to
advance to Digital Input 2.

2. Use the UP/DOWN arrow keys to locate the
desired function for the Digital Input 1. Press YES
to select the desired function.

3. Press YES to configure Digital Input 2 or NO to
advance to the keypad lockout setup prompt.

4. Use the UP/DOWN arrow keys to locate the
desired function for the Digital Input 2. Press YES
to select the desired function.

The display now shows the keypad lockout setup
prompt. See Enabling Keypad Lockout (Lockout)
section for instructions.

Enabling Keypad Lockout (Lockout)

The T600MEP-2 has three levels of keypad lockout.
The levels and degree of lockout are shown in Table 2.

To set the keypad lockout level while in the Installer
Configuration Menu:

1. Answer NO to all prompts until the keypad lockout
setup prompt appears in the display. Press YES to
enter the keypad lockout menu.

2. Use the UP/DOWN arrow keys to locate the
desired lockout level. Press YES to select the
level.

The display now shows the power delay setup prompt.
See the Setting the Power-up Delay (Pwr del) section
for instructions.

Table 2: Keypad Lockout Levels

Level 0 Level 1 Level 2

Resume to

Scheduling

Temperature

Setpoints

System

Mode Setting

Fan Mode

Setting

Schedules

Setting

Clock

Setting

Schedule

Hold

Yes access Yes access No access

Yes access No access No access

Yes access Yes access No access

Yes access Yes access No access

Yes access No access No access

Yes access Yes access Yes access

Yes access Yes access No access

Setting the Power-up Delay (Pwr del)

On initial power-up of the T600MEP-2 (or each time
power is removed and reapplied), there is a delay
before any operation is authorized (fan, cooling, and
heating). The delay time is adjustable between 10 and
120 seconds. This parameter can also be used to
sequence the start-up of multiple units in one location.

Note: When adjusting the time with the UP/DOWN
arrow keys, holding the keys down changes the time
by 10-second intervals.

To set the delay time while in the Installer
Configuration Menu:

1. Answer NO to all prompts until the power delay
setup prompt appears in the display. Press YES to
enter the power delay setup menu.

2. Use the UP/DOWN arrow keys to adjust the
power-up delay setting. Press YES to store the
setting.

The display now shows the frost protection setup
prompt. See Enabling Frost Protection (Frost pr)
section for setup instructions.

Enabling Frost Protection (Frost pr)

Frost protection establishes a minimum heating
setpoint of 42°F (5.5°C) to prevent freezing in the zone
controlled by the thermostat. If enabled, frost
protection is activated even if the thermostat is set to
the Off System Mode. If frost protection is active, it is
displayed as an alarm (Frost on with the backlight lit)
on the Status Display Menu.

To enable frost protection while in the Installer
Configuration Menu:

1. Answer NO to all prompts until the frost protection
setup prompt appears in the display. Press YES to
enter the frost protection menu.

2. Use the UP/DOWN arrow keys to select off or on.
Press YES to store the selection.

The display now shows the maximum heating setpoint
prompt. See the Setting the Maximum Heating
Setpoint (Heat max) section for instructions.

Setting the Maximum Heating Setpoint (Heat max)

The maximum heating setpoint establishes the
maximum temperature in the heating setpoint range
that can be adjusted from the Main User Menu for both
occupied and unoccupied periods. The parameter is
adjustable from 40 to 90°F (4.5 to 32°C).

Note: When adjusting the temperature, holding the
keys down changes the temperature by 5 F/C°
increments.

T600MEP-2 Programmable Economizer Thermostat Installation Instructions 7

To set the maximum heating setpoint while in the
Installer Configuration Menu:

1. Answer NO to all prompts until the maximum
heating setpoint prompt appears in the display.
Press YES to enter the maximum heating setpoint
menu.

2. Use the UP/DOWN arrow keys to adjust the
maximum heating setpoint temperature. Press
YES to store the value.

The display now shows the minimum cooling setpoint
prompt. See Setting the Minimum Cooling Setpoint
(Cool min) section for instructions.

Setting the Minimum Cooling Setpoint (Cool min)

The minimum cooling setpoint establishes the
minimum temperature in the cooling setpoint range
that can be adjusted from the Main User Menu for both
occupied and unoccupied periods. The parameter is
adjustable from 54 to 100°F (12 to 37.5°C).

Note: When adjusting the temperature, holding the
keys down changes the temperature by 5 F/C°
increments.

To set the minimum cooling setpoint while in the
Installer Configuration Menu:

1. Answer NO to all prompts until the minimum
cooling setpoint prompt appears in the display.
Press YES to enter the minimum cooling setpoint
menu.

2. Use the UP/DOWN arrow keys to adjust the
minimum cooling setpoint temperature. Press YES
to store the value.

The display now shows the anti-short cycle timer
prompt. See Setting the Anti-short Cycle Timer
(Anticycl) section for instructions.

Setting the Anti-short Cycle Timer (Anticycl)

The anti-short cycle timer establishes the minimum
on/off times for the cooling and heating stages. The
timer is adjustable from 0 to 5 minutes in 1-minute
increments. Set the anti-short cycle to 0 for equipment
that possesses its own anti-short cycle timer.

!

CAUTION: Risk of Property Damage.

Do not set the T600MEP-2 anti-short cycling timer to
0 minutes if the controlled equipment is not
protected by its own internal anti-short cycling timer.
Doing so may result in damage to the controlled
equipment.

To set the anti-short cycle time while in the Installer
Configuration Menu:

1. Answer NO to all prompts until the anti-short cycle
timer prompt appears in the display. Press YES to
enter the anti-short cycle timer menu.

2. Use the UP/DOWN arrow keys to adjust the
minimum on/off times for the heating and cooling
stages. Press YES to store the value.

The display now shows the heating cycles per hour
setup prompt. See Setting the Heating Cycles per
Hour (Heat cph) section for instructions.

Setting the Maximum Heating Cycles per Hour
(Heat cph)

The heating cycles per hour establishes the number of
times the equipment or stages are turned on and off in
one hour. The selection ranges from three to eight
cycles per hour.

Note: A higher number of heating cycles per hour
results in more accurate temperature control, but could
accelerate the wear of mechanical components in the
equipment.

To set the maximum number of heating cycles per
hour while in the Installer Configuration Menu:

1. Answer NO to all prompts until the heating cycles
per hour prompt appears in the display. Press
YES to enter the heating cycles per hour menu.

2. Use the UP/DOWN arrow keys to adjust the
maximum number of heating cycles per hour.
Press YES to store the value.

The display now shows the cooling cycles per hour
setup prompt. See Setting the Cooling Cycles per
Hour (Cool cph) section for instructions.

Setting the Maximum Cooling Cycles per Hour
(Cool cph)

The cooling cycles per hour establishes the number of
times the equipment or stages are turned on and off in
one hour. The selection ranges from three to four
cycles per hour.

Note: A higher number of cooling cycles per hour
results in more accurate temperature control, but could
accelerate the wear of mechanical components in the
equipment.

To set the maximum number of cooling cycles per
hour while in the Installer Configuration Menu:

1. Answer NO to all prompts until the cooling cycles
per hour prompt appears in the display. Press
YES to enter the cooling cycles per hour menu.

2. Use the UP/DOWN arrow keys to adjust the
maximum number of cooling cycles per hour.
Press YES to store the value.

8 T600MEP-2 Programmable Economizer Thermostat Installation Instructions

The display now shows the minimum heating/cooling
deadband prompt. See Setting the Heating/Cooling
Deadband (Deadband) section for instructions.

Setting the Heating/Cooling Deadband (Deadband)

The heating/cooling deadband setting establishes the
minimum difference between the heating and cooling
setpoints. The range is adjustable from 2 to 4 F°
(1 to 2 C°).

To change the minimum deadband between the
heating and cooling setpoints while in the Installer
Configuration Menu:

1. Answer NO to all prompts until the deadband
setpoint prompt appears in the display. Press YES
to enter the deadband setpoint menu.

2. Use the UP/DOWN arrow keys to adjust the
minimum deadband between the heating and
cooling setpoints. Press YES to store the value.

The display now shows the fan control prompt. See
Setting the Fan Control (Fan cont) section for
instructions.

Setting the Fan Control (Fan cont)

This parameter controls how the fan activates in
response to a call for heating.

When the fan is in Auto Mode (as selected on the Main
User Menu):

• Selecting on enables the thermostat to control the
fan on a call for heating or cooling.

• Selecting off enables the thermostat to energize
the fan on a call for cooling only. On a call for
auxiliary heating, the fan is controlled by the
equipment fan limit control.

To set the fan control while in the Installer
Configuration Menu:

1. Answer NO to all prompts until the fan control
prompt appears in the display. Press YES to enter
the fan control menu.

2. Using the UP/DOWN arrow keys, select on or off.
Press YES to store the selection.

The display now shows the fan delay prompt. See
Setting the Fan Delay (Fan del) section for
instructions.

Setting the Fan Delay (Fan del)

The fan delay extends the fan operation by
60 seconds after the call for heating or cooling has
ended. This feature is only active when the fan is in
the Auto mode.

To enable the fan delay while in the Installer
Configuration Menu:

1. Answer NO to all prompts until the fan delay
prompt appears in the display. Press YES to enter
the fan delay menu.

2. Using the UP/DOWN arrow keys, select on or off.
Press YES to store the selection.

The display now shows the occupancy override
prompt. See Establishing the Temporary Occupancy
Time (TOccTime) section for instructions.

Establishing the Temporary Occupancy Time
(TOccTime)

The temporary occupancy time is the length of time
the occupied mode setpoints are used when the
override function is enabled (the override function can
be enabled from the Main User Menu or from one of
the digital inputs) or a temporary setpoint is entered.
The range is adjustable from 0 to 12 hours.

To change the temporary occupancy time while in the
Installer Configuration Menu:

1. Answer NO to all prompts until the temporary
occupancy time prompt appears in the display.
Press YES to enter the temporary occupancy time
menu.

2. Use the UP/DOWN arrow keys to adjust the length
of time the temporary occupancy setpoint should
be in effect. Press YES to store the time.

The display now shows the room sensor calibration
prompt. See Room Air Sensor Calibration (Cal RS)
section for instructions.

Room Air Sensor Calibration (Cal RS)

An offset can be added or subtracted to the actual
displayed room temperature as needed. The range is
±5.0 F° (±2.5 C°), adjustable in increments of 1 F°
(0.5 C°).

To change the room sensor calibration/offset while in
the Installer Configuration Menu:

1. Answer NO to all prompts until the room sensor
calibration prompt appears in the display. Press
YES to enter the room sensor calibration menu.

2. Use the UP/DOWN arrow keys to adjust the
correction that should be applied to the sensor
reading. Press YES to store the offset.

The display now shows the outdoor air sensor
calibration prompt. See Outdoor Air Sensor Calibration
(Cal OS) section for instructions.

Outdoor Air Sensor Calibration (Cal OS)

An offset can be added or subtracted to the actual
displayed outdoor air temperature as needed. The
range is ± 5.0F° (± 2.5C°), adjustable in increments of
1 F° (0.5 C°).

T600MEP-2 Programmable Economizer Thermostat Installation Instructions 9

To change the outdoor air sensor calibration/offset
while in the Installer Configuration Menu:

1. Answer NO to all prompts until the outdoor sensor
calibration prompt appears in the display. Press
YES to enter the outdoor sensor calibration menu.

2. Use the UP/DOWN arrow keys to adjust the
correction that should be applied to the sensor
reading. Press YES to store the offset.

The display now shows the heating stage setting
prompt. See Enable/Disable Second Heating Stage
(H Stage) section for instructions.

Enable/Disable Second Heating Stage (H Stage)

This parameter reverts the operation of two-stage
thermostats to a single stage when the second heating
stage is not needed.

To enable or disable the second heating stage while in
the Installer Configuration Menu:

1. Answer NO to all prompts until the setting heating
stages prompt appears in the display. Press YES
to enter the setting heating stages menu.

2. Using the UP/DOWN arrow keys; select 1.0 or 2.0
stages. Press YES to store the selection.

The display now shows the cooling stage setting
prompt. See Enable/Disable Second Cooling Stage
(C Stage) section for instructions.

Enable/Disable Second Cooling Stage (C Stage)

This parameter reverts the operation of two-stage
thermostats to a single stage when the second cooling
stage is not needed.

To enable or disable the second cooling stage while in
the Installer Configuration Menu:

1. Answer NO to all prompts until the setting cooling
stages prompt appears in the display. Press YES
to enter the setting cooling stages menu.

2. Using the UP/DOWN arrow keys, select 1.0 or 2.0
stages. Press YES to store the selection.

The display now shows the heating lockout prompt.
See Setting the Heating Lockout (H lock) section for
instructions.

The heating lockout temperature parameter is
adjustable from -15 to 120°F (-26 to 49°C) in
increments of 5 F/C°.

To change the outdoor air temperature heating lockout
while in the Installer Configuration Menu:

1. Answer NO to all prompts until the heating lockout
prompt appears in the display. Press YES to enter
the heating lockout menu.

2. Use the UP/DOWN arrow keys to adjust the
lockout temperature. Press YES to store the value.

The display now shows the cooling lockout prompt.
See Setting the Cooling Lockout (C lock) section for
instructions.

Setting the Cooling Lockout (C lock)

This feature disables cooling operation based on
outdoor air temperature (requires outdoor air
temperature sensor to be connected for the function to
be enabled). If the outdoor air temperature is below
the cooling lockout temperature, cooling operation is
disabled.

The cooling lockout temperature parameter is
adjustable from -40 to 95°F (-40 to 35°C) in
increments of 5 F/C°.

To change the outdoor air temperature cooling lockout
while in the Installer Configuration Menu:

1. Answer NO to all prompts until the cooling lockout
prompt appears in the display. Press YES to enter
the cooling lockout menu.

2. Use the UP/DOWN arrow keys to adjust the
lockout temperature. Press YES to store the value.

The display now shows the number of events prompt.
See Selecting the Number of Events (2/4event)
section for instructions.

Selecting the Number of Events (2/4event)

This feature sets the number of events per 24-hour
period that can be programmed into the daily
schedule.

Two events select one occupied and one unoccupied
period per 24 hours and four events selects two
occupied and two unoccupied periods per 24 hours.

Setting the Heating Lockout (H lock)

This feature disables heating operation based on
outdoor air temperature (requires outdoor air
temperature sensor to be connected for the function to
be enabled). If the outdoor air temperature is above
the heating lockout temperature, heating operation is
disabled.

10 T600MEP-2 Programmable Economizer Thermostat Installation Instructions

To change the number of events in a 24-hour period
while in the Installer Configuration Menu:

1. Answer NO to all prompts until the number of
events prompt appears in the display. Press YES
to enter the number of events menu.

2. Use the UP/DOWN arrow keys to select 2 or
4 events. Press YES to store the value.

The display now shows the auxiliary contact
configuration prompt. See Configuring the Auxiliary
Contact (Aux cont) section for instructions.

Configuring the Auxiliary Contact (Aux cont)

The auxiliary contact is an output that can be used to
energize peripheral devices (for example, lighting
equipment, exhaust fans, and economizers). The
contact can be configured as normally open or
normally closed and toggles with the internal
occupied/unoccupied schedule (or the NSB contact on
one of the digital inputs, if used).

Table 3: Operation of Auxiliary Contact

Configuration

Setup

Normally Opened

Normally Closed

Contact

Occupied

Status

Closed Opened

Opened Closed

Contact

Unoccupied

Status

To configure the auxiliary contact while in the Installer
Configuration Menu:

1. Answer NO to all prompts until the auxiliary
contact prompt appears in the display. Press YES
to enter the auxiliary contact menu.

2. Use the UP/DOWN arrow keys to select Normally
Open (N.O.) or Normally Closed (N.C.). Press
YES to store the selection.

The display now shows the progressive recovery
prompt. See Enable/Disable the Progressive Recovery
(Prog Rec) section for instructions.

Enable/Disable Progressive Recovery (Prog Rec)

When progressive recovery is enabled, the desired
occupied temperature is attained by the time the
occupied schedule starts.

When progressive recovery is disabled, the system
restarts at the programmed occupied time.

Note: Programming one of the digital inputs to
remote NSB disables the progressive recovery
function.

To enable or disable the progressive recovery feature
while in the Installer Configuration Menu:

The display now shows the economizer changeover
setpoint menu. See Setting the Economizer
Changeover Temperature (Chngstpt) section for
instructions.

Setting the Economizer Changeover Temperature
(Chngstpt)

The T600MEP-2 economizer changeover strategy is
based on outdoor air temperature (requires outdoor air
temperature sensor). When the outdoor air
temperature is below the changeover setpoint, free
cooling is used (economizer). When the outdoor air
temperature is above the setpoint, mechanical cooling
is used (compressor).

To adjust the changeover setpoint while in the Installer
Configuration Menu:

1. Answer NO to all prompts until the economizer
changeover setpoint prompt appears in the
display. Press YES to enter the changeover
setpoint menu.

2. Use the UP/DOWN arrow keys to adjust the
economizer changeover temperature. Press YES
to store the value.

The display now shows the outdoor air damper
minimum position menu. See Setting the Outdoor Air
Damper Minimum Position (Min pos) section for
instructions.

Setting the Outdoor Air Damper Minimum Position
(Min pos)

The minimum position for the outdoor air dampers on
the economizer can be adjusted as necessary. The
dampers are energized to minimum position when the
fan (G terminal) is energized and the thermostat is in
the occupied mode. When the schedule is in the
unoccupied mode, the minimum position is 0%.

To set the minimum position for the outdoor air
dampers while in the Installer Configuration Menu:

1. Answer NO to all prompts until the minimum
position setpoint prompt appears in the display.
Press YES to enter the minimum position menu.

2. Use the UP/DOWN arrow keys to adjust the
minimum position for the outdoor air damper.
Press YES to store the value.

The display now shows the mechanical cooling mode
menu. See Setting the Mechanical Cooling Mode
(C mech) section for instructions.

1. Answer NO to all prompts until the progressive
recovery prompt appears in the display. Press
YES to enter the progressive recovery menu.

2. Use the UP/DOWN arrow keys to select on or off.
Press YES to store the selection.

T600MEP-2 Programmable Economizer Thermostat Installation Instructions 11

Setting the Mechanical Cooling Mode (C mech)

This setting determines whether to allow the operation
of mechanical cooling if the free cooling (economizer)
cannot maintain the cooling setpoint.

• Selecting off means the mechanical cooling never
operates at the same time as the free cooling. This
option typically applies when the mixed air
temperature sensor is installed after the
mechanical cooling coils.

• Selecting on enables mechanical cooling to
operate when the free cooling (economizer)
cannot maintain the cooling setpoint. This option
typically applies when the mixed air temperature
sensor is installed before the mechanical cooling
coils.

To set the mechanical cooling mode while in the
Installer Configuration Menu:

1. Answer NO to all prompts until the mechanical

cooling mode prompt appears in the display.
Press YES to enter the mechanical cooling mode
menu.

2. Use the UP/DOWN arrow keys to choose on or

off. Press YES to store the selection.

The display now shows the mixed air setpoint menu.
See Setting the Mixed Air Temperature Setpoint
(Mix stpt) section for instructions.

Setting the Mixed Air Temperature Setpoint
(Mix stpt)

The mixed air temperature setpoint establishes the
mixed air temperature when operating in the
economizer mode. The economizer is adjusted
accordingly to maintain the mixed air temperature
setpoint.

The mixed air temperature setpoint is adjustable from
50 to 90°F (10 to 32°C).

To adjust the mixed air temperature setpoint while in
the Installer Configuration Menu:

1. Answer NO to all prompts until the mixed air

setpoint prompt appears in the display. Press
YES to enter the mixed air setpoint menu.

Displaying the Mixed Air Temperature (Display)
(Only Available if Mixed Air Temperature Sensor is
Installed)

The mixed air temperature can be displayed if a mixed
air temperature sensor is installed. The temperature
can be used to help service and troubleshoot the
equipment and economizer operation. The mixed air
temperature is only accessible through the installer
configuration menu.

To access the mixed air temperature while in the
Installer Configuration Menu:

1. Answer NO to all prompts until the display mixed
air temperature prompt appears in the display.
Press YES to display mixed air temperature.

2. The mixed air temperature is displayed. After
about 45 seconds, the T600MEP-2 returns to the
Status Display Menu or press YES to advance to
the exit menu display. The exit menu appears.

3. Press YES to exit the Installer Configuration
Menu or press NO to return to the beginning of
the menu (digital input configuration).

Operation

Programming/Operating the T600MEP-2

Once the T600MEP-2 is configured through the
Installer Configuration Menu, the thermostat’s
operating parameters can be programmed through the
Main User Menu (access the Main User Menu by
pressing the MENU key during normal thermostat
operation). The Main User Menu contains the basic
operating features of the T600MEP-2.

The Main User Menu uses Auto Help. Auto Help is
displayed automatically in the Main User Menu when
there is a pause in programming activity. To exit Auto
Help, continue with the programming selection.

When the thermostat is in the Main User Menu and is
left unattended for 45 seconds, it reverts to the Status
Display Menu.

Follow the steps in Table 4 to program the
T600MEP-2.

2. Use the UP/DOWN arrow keys to adjust the
mixed air setpoint. Press YES to store the
temperature.

The display mixed air temperature prompt is now
displayed. See Displaying the Mixed Air Temperature
(Display) section for instructions.

12 T600MEP-2 Programmable Economizer Thermostat Installation Instructions

Table 4: Programming the T600MEP-2

RoomTemp

75.0 °F

Override
schd Y/N

Resume
schd Y/N

Temperat
set? Y/N

Sys mode
set? Y/N

Press the MENU key while in the
Status Display Menu to enter the Main
User Menu.

Overrides Unoccupied Setpoints
Only Appears if Thermostat is in
Unoccupied State
See Enabling Override Schedule.

Resumes Regular Programmed
Schedule and Setpoints
Only Appears if Thermostat is in
Override Mode
See Resuming the Programmed
Schedule.

Sets the Temperature Setpoints
See Entering Temperature Setpoints.

Selects the System Mode
Default: Automatic Mode (auto)
See Selecting the System Mode.

parameter (see the Configuring the T600MEP-2
section).

Note: If one of the digital inputs is configured to
operate as a remote override contact, this menu is
disabled.

To override the unoccupied state while in the Main
User Menu:

1. Answer NO to all prompts until the Override
Schedule prompt appears. If the Thermostat is in
the unoccupied state, this is the first prompt.

2. Press YES to enable the occupied setpoint. The
T600MEP-2 returns to the Status Display Menu.

When scrolling through the Status Display Menu,
Override now appears for the schedule status
parameter.

Resuming the Programmed Schedule

This menu only appears when the T600MEP-2 is in
the:

• unoccupied override mode

• permanent occupied hold mode

• permanent unoccupied hold mode

Fan mode
set? Y/N

Schedule
set? Y/N

Clock
set? Y/N

Schedule
hold Y/N

Selects the Fan Mode
Default: Automatic (auto)
See Selecting the Fan Mode.

Sets the Occupied and Unoccupied
Time Periods
See Programming the Daily Schedule

– Two Event and Programming the
Daily Schedule – Four Event.

Sets the Day and Time
See Setting the Day and Time.

Sets a Permanent Hold on the
Schedule or Resumes the Schedule
See Setting Schedule Hold.

Enabling Override Schedule
Note: Enabling Override Schedule only appears

when in Unoccupied Mode.
The override schedule prompt only appears when the

thermostat is in the unoccupied state. This menu
selection gives the user the option of overriding the
unoccupied setpoints with the occupied setpoints for
the amount of time specified under the Establishing
the Temporary Occupancy Time (TOccTime)

Note: If the T600MEP-2 is not in one of these
modes, this prompt does not appear. Answering yes to
this prompt enables the T600MEP-2 to resume the
regularly scheduled program and setpoints.

To resume the schedule while in the Main User Menu:

1. Answer NO to all prompts until the Resume
Schedule prompt appears. If the thermostat is in
the override state, this is the first prompt.

2. Press YES to resume the programmed schedule.

The T600MEP-2 returns to the Status Display Menu.

Entering Permanent Temperature Setpoints

The first prompt appearing in the Main User Menu of
the T600MEP-2 is to set the permanent temperature
setpoints. Permanent setpoints are stored in the
programmed schedule.

To enter the permanent heating and cooling setpoints
for the occupied and unoccupied modes, follow the
steps in Table 5. When changing the temperatures,
pressing the keys once changes the temperature

0.5 F/C° and holding down the keys changes the

temperature by 5 F/C° increments.

T600MEP-2 Programmable Economizer Thermostat Installation Instructions 13

Table 5: Entering Permanent Temperature
Setpoints

RoomTemp

75.0°F

Temperat
set? Y/N

Cooling
set? Y/N

Press MENU from the Status Display
Menu to enter the Main User Menu.

Answer NO to all prompts until the
temperature set prompt appears in
the display (it may be the first
prompt). Press YES to enter
temperature setting menu.

Press YES to change occupied
cooling setpoint. Press NO to
advance to occupied heating setpoint
menu.

Cooling

75.0°F

Heating
set? Y/N

Use the UP/DOWN arrow keys to set
temperature. Press YES to store
value and advance to next menu.

Press YES to change the occupied
heating setpoint. Press NO to
advance to unoccupied cooling
setpoint menu.

Heating

68.0°F

Unocc CL
set? Y/N

Use the UP/DOWN arrow keys to set
temperature. Press YES to store
value and advance to next menu.

Press YES to change the unoccupied
cooling setpoint. Press NO to
advance to the unoccupied heating
setpoint.

Unocc CL

80.0°F

Use the UP/DOWN arrow keys to set
temperature. Press YES to store
value and advance to next menu.

Unocc HT
set? Y/N

Press YES to change the unoccupied
heating setpoint. Press NO to
advance to temperature display units.

Unocc HT

62.0°F

Use the UP/DOWN arrow keys to set
temperature. Press YES to store
value and advance to next menu.

Exit?
Y/N

Press YES to return to the Status
Display Menu or NO to re-enter the
temperature setting menu.

Entering Temporary Temperature Setpoints

To temporarily change the setpoint:
Press the UP/DOWN arrow keys to change the

temporary setpoint for the current mode of operation.
Note: Whether the thermostat is heating or cooling,

the respective setpoint is temporarily adjusted.
Note: To toggle between the temporary heating and

cooling setpoints, press the NO key while changing the
temporary setpoints.

Ending Temporary Temperature Setpoints

The temporary setpoints remain in effect for the
duration set in the Temporary Occupancy Time
parameter (TOccTime) or until manually released.

To release the temporary setpoint sooner, while in the
main User Menu:

1. Answer YES to the first prompt to appear.

2. If the thermostat does not immediately return to
the Status Display Menu, press MENU again and
YES to exit the Main User Menu.

The setpoint reverts to the Permanent Temperature
Setpoint.

Selecting the System Mode

The T600MEP-2 has four system modes.

• Automatic Mode (auto)

Automatic changeover between heating and
cooling. This is the default setting.

• Cooling Mode (cool)

Cooling operation only.

• Heating Mode (heat)

Heating operation only.

• Off Mode (off)

The T600MEP-2 is off; however, when frost
protection is on (see Enabling Frost Protection
[Frost pr] section) the thermostat still calls for heat,
if required.

To set the system mode while in the Main User Menu:

°F/°C set?
Y/N

Press YES to set the display units to
°F or °C. Press NO to advance to
temperature setpoint type menu.

14 T600MEP-2 Programmable Economizer Thermostat Installation Instructions

1. Answer NO to all prompts until the system mode
prompt appears in the display. Press YES to set
the system mode.

2. Use the UP/DOWN arrow keys to locate the
desired system mode. Press YES to select the
desired system mode.

3. Press YES to return to the Status Display Menu or
NO to return to the system mode selection menu.

Selecting the Fan Mode

The T600MEP-2 has three fan mode settings.

• On Fan Mode (on)

Energizes the fan all the time for both occupied
and unoccupied periods (even if the system mode
is set to off).

• Automatic Fan Mode (auto)

Operates the fan only on a call for heating or
cooling for both occupied and unoccupied periods.
This is the default setting.

• Smart Fan Mode (smart)

Energizes the fan all the time for occupied periods
and only on a call for heating and cooling in
unoccupied periods.

To select the fan mode while in the Main User Menu:

1. Answer NO to all prompts until the fan mode
prompt appears in the display. Press YES to set
the fan mode.

2. Use the UP/DOWN arrow keys to locate the
desired fan mode. Press YES to select the desired
fan mode.

3. Press YES to return to the Status Display Menu or
NO to return to the fan mode selection menu.

Programming the Daily Schedule – Two-Event

The schedule setting menu is used to enter the
occupied and unoccupied time periods for each day of
the week. The schedule-setting menu reflects either a
two-or four-event schedule per day based on what was
selected in the Selecting the Number of Events
(2/4event) parameter during the configuring process. If
the schedule-setting menu does not reflect a two-event
schedule, return to the Selecting the Number of Events
(2/4event) menu in the configuration process and
select two events.

When changing the time, press the UP/DOWN arrow
keys to change the time in 1-minute increments. Hold
the keys down to change the time in 30-minute
increments.

Note: Programming one of the digital inputs to
remote NSB disables menu.

To set the time schedule for two-event schedule,
follow the steps in Table 6.

See Events 1 and 2 in Table 6 for an example of a
two-event office schedule.

Table 6: Programming the
Daily Schedule – Two-Event

RoomTemp

75.0°F

Schedule
set? Y/N

Press MENU from the Status
Display Menu to enter the Main User
Menu.

Answer NO to all prompts until the
schedule set prompt appears in the
display. Press YES to enter the
scheduling menu.

Monday
set? Y/N

Occupied
day? Y/N

Press YES to set the schedule for
Monday or NO to advance to
Tuesday.

Press YES to set the occupied start
time for Monday or NO to advance
to Tuesday (selecting NO will leave
the thermostat in the unoccupied
mode for the entire day).

Occupied
12:00 AM

Use the UP/DOWN arrow keys to
set the occupied start time. Press
YES to enter the time.

Unoccup
12:00 AM

Use the UP/DOWN arrow keys to
set the unoccupied start time. Press
YES to enter the time.

Tuesday
set? Y/N

Press YES to set the schedule for
Tuesday or NO to advance to
Wednesday.

Copy Y/N
previous

Press YES to copy the schedule
from the previous day. Press NO to
set a different schedule.

Wednesda
set? Y/N

Exit?
Y/N

If YES was pressed, the next prompt
will be for Wednesday. Repeat
procedure for all days of the week.

After setting the schedule for all
days of the week, following the last
entry for Sunday, press YES to
return to the Status Display Menu or
NO to start again at Monday.

T600MEP-2 Programmable Economizer Thermostat Installation Instructions 15

Programming the Daily Schedule – Four-Event

The schedule setting menu is used to enter the
occupied and unoccupied time periods for each day of
the week. The schedule-setting menu reflects either a
two- or four-event schedule per day based on what
was selected in the Selecting the Number of Events
(2/4event) menu during the configuring process. If the
schedule-setting menu does not reflect a four-event
schedule, return to the Selecting the Number of Events
(2/4event) menu in the configuration process and
select four events.

When changing the time, pressing the UP/DOWN
arrow keys changes the time in 1-minute increments.
Holding the keys down changes the time in 30-minute
increments.

Note: Programming one of the digital inputs to
remote NSB disables menu.

To set the time schedule for a four-event schedule,
follow the steps in Table 7.

Table 8 shows an example of a four-event office
schedule.

Table 7: Programming the
Daily Schedule – Four-Event

RoomTemp

75.0°F

Schedule
set? Y/N

Press MENU from the Status
Display Menu to enter the Main User
Menu.

Answer NO to all prompts until the
schedule set prompt appears in the
display. Press YES to enter the
scheduling menu.

Monday
set? Y/N

Press YES to set the schedule for
Monday or NO to advance to
Tuesday.

Occupied
day? Y/N

Occupied
12:00 AM

Unoccup
12:00 AM

Occupie2
12:00 AM

Unoccup2
12:00 AM

Tuesday
set? Y/N

Copy Y/N
previous

Wednesda
set? N/A

Exit?
Y/N

Press YES to set the occupied start
time for Monday or NO to advance
to Tuesday (selecting NO leaves the
thermostat in the unoccupied mode
for the entire day).

Use the UP/DOWN arrow keys to
set the first occupied start time.
Press YES to enter the time.

Use the UP/DOWN arrow keys to
set the first unoccupied start time.
Press YES to enter the time.

Use the UP/DOWN arrow keys to
set the second occupied start time.
Press YES to enter the time.

Use the UP/DOWN arrow keys to
set the second unoccupied start
time. Press YES to enter the time.

Press YES to set the schedule for
Tuesday or NO to advance to
Wednesday.

Press YES to copy the schedule
from the previous day. Press NO to
set a different schedule.

If YES was pressed, the next prompt
will be for Wednesday. Repeat
procedure for all days of the week.

After setting the schedule for all
days of the week, following the last
entry for Sunday, press YES to
return to the Status Display Menu or
NO to start again at Monday.

16 T600MEP-2 Programmable Economizer Thermostat Installation Instructions

Table 8: Example of a Four-Event Office Schedule

Event #1 Event #2 Event #3 Event #4

Event

Occupied Unoccupied Occupied 2 Unoccupied 2

Cool Heat Cool Heat Cool Heat Cool Heat

Monday

Tuesday

Wednesday

Thursday

Friday

Saturday

Sunday

* Programming events to the same time cancels the last period and leaves the thermostat in unoccupied mode.

72°F

(22°C)

7:00 A.M. 5:00 P.M. 12:00 P.M.* 12:00 P.M.*
7:00 A.M. 5:00 P.M. 12:00 P.M.* 12:00 P.M.*
7:00 A.M. 5:00 P.M. 12:00 P.M.* 12:00 P.M.*
7:00 A.M. 5:00 P.M. 7:00 P.M. 10:30 P.M.

7:00 A.M. 5:00 P.M. 7:00 P.M. 10:30 P.M.
12:00 P.M.* 12:00 P.M.* 12:00 P.M.* 12:00 P.M.*
12:00 P.M.* 12:00 P.M.* 12:00 P.M.* 12:00 P.M.*

70°F

(21°C)

80°F

(27°C)

62°F

(17°C)

72°F

(22°C)

70°F

(21°C)

80°F

(27°C)

Setting the Day and Time

Upon initial power-up (or after a power loss of
greater than 6 hours), the T600MEP-2 shows a
SetClock alarm. As the thermostat scrolls through

When the thermostat scrolls through the day and time,
the new day and time should be displayed (and no
alarm/backlight should be present). If the day or time is
incorrect, repeat the Setting the Day and Time
procedure.

the Status Display Menu, the SetClock message
causes the backlight to light up until the clock is set.

When adjusting the time with the UP/DOWN arrow
keys, holding the keys down changes the time in
30-minute increments.

To set the clock while in the Main User Menu:

Setting Schedule Hold

This menu is used to set a permanent hold on the
internal scheduling or resume the schedule. The
permanent hold is typically used for unscheduled events
that extend for long periods of time.

62°F

(17°C)

1. Answer NO to all prompts until the clock set
prompt appears in the display. Press YES to
enter the clock set menu.

2. Press YES to set the time or NO to advance to
the day set menu.

3. Use the UP/DOWN arrow keys to adjust the
time. When the correct time is displayed, press
YES to store the time.

4. Press YES to enter the day set menu or NO to
enter the clock format menu.

5. Use the UP/DOWN arrow keys to adjust the day.
When the correct day is displayed, press YES to
store the day.

6. Press YES to choose the time format or NO to
access the Main User Menu exit prompt.

7. Use the UP/DOWN arrow keys to select the
desired time format. Press YES to enter format.

8. Press YES to return to the Status Display Menu
or NO to return to the time set menu.

Note: Displayed only if Digital Input DI1 or DI2 is
configured for remote NSB.

Following are the three selections for this menu:

• Permanent Occupied Hold (occ hold)
This selection puts the thermostat into a permanent
occupied mode using the occupied setpoints.
Occupied hold appears in the Status Display Menu
when this selection is active.

• Permanent Unoccupied Hold

This selection puts the T600MEP-2 into a permanent
unoccupied mode using the unoccupied setpoints.
Unoccup hold appears in the Status Display Menu
when this selection is active.

• Resume

This selection cancels the permanent hold and
enables the regular program schedule.

To enable the permanent hold feature while in the Main
User Menu:

1. Answer NO to all prompts until the schedule hold
prompt appears in the display. Press YES to enter
the schedule hold type menu.

T600MEP-2 Programmable Economizer Thermostat Installation Instructions 17

2. Use the UP/DOWN arrow keys to locate the
desired permanent hold type (or resume
schedule). Press YES to enter the choice.

3. Press YES to return to the Status Display Menu
or NO to change the schedule hold selection
again.

Accessories

Using the information in Table 9, contact the nearest

Table 9: Optional Accessories
(Includes Mounting Hardware)

Item Product Code

Remote Indoor Temperature Sensor
Outdoor Air Temperature Sensor
Duct Mount Temperature Sensor
Remote Indoor Temperature Sensor
with Occupancy Override and LED

Number

SEN-600-1
SEN-600-2
SEN-600-3

SEN-600-4

Johnson Controls® branch office or wholesale
distributor to order these accessories.

Technical Specifications

Product

Power Requirements

Relay Contact Rating

Maximum Inductive

Digital Inputs

Economizer Output

Recommended Wire Size

Thermostat Measurement

Range

Sensor Type:

Resolution:

Control Accuracy

Outdoor Air Temperature

Indication Range

Setpoint Control Range

Minimum Deadband

Ambient Operating

Conditions

Ambient Storage

Conditions

Dimensions (H x W x D)

Shipping Weight

UL and cUL Listing

FCC Compliance

Industry Canada

The performance specifications are nominal and conform to acceptable industry standards. For application at conditions beyond these
specifications, consult the local Johnson Controls office. Johnson Controls, Inc. shall not be liable for damages resulting from misapplication or
misuse of its products.

T600MEP-2 Programmable Economizer Thermostat
20-30 VAC, 50/60 Hz, 24 VAC nominal, Class 2 or Safety Extra Low Voltage (SELV)
1 ampere with in-rush surges up to 3 amperes, 30 VAC maximum, Class 2

Relay dry contact only across the C terminal to DI1 or DI2
0 to 10 VDC into 2 K ohm resistance minimum
18 gauge maximum, 22 gauge recommended

-40 to 122°F (-40 to 50°C)

Local 10 K ohm NTC thermistor

±0.2F° (±0.1C°)
±0.9F° (±0.5C°) @ 70°F (21°C) typical calibrated

-40 to 50°C (-40 to 122°F)

Cooling: 54 to 100°F (12 to 37.5°C) in 1/2 degree increments
Heating: 40 to 90°F (4.5 to 32°C) in 1/2 degree increments

(Between heating and cooling) 2F° or 1C°
32 to 122°F (0 to 50°C); 0 to 95% RH noncondensing

-22 to 122°F (-30 to 50°C); 0% to 95% RH noncondensing

4.94 x 3.38 x 1.13 in. (125 x 86 x 29 mm)

0.75 lb (0.34 kg)
File E27734 with CCN’s XAPX (US, UL 873) and XAPX7 (Canada, CSA C22.2 No. 24)
This equipment has been tested and found to comply with the limits for a Class A digital

device and verified to Class B pursuant tos Part 15 of FCC Rules. These limits are
designed to provide reasonable protection against harmful interference when this
equipment is operated in a commercial environment. This equipment generates, uses, and
can radiate radio frequency energy and, if not installed and used in accordance with the
instruction manual, may cause harmful interference to radio communications. Operation of
this equipment in a residential area is likely to cause harmful interference, in which case the
user will be required to correct the interference at his/her own expense.

This Class A digital apparatus meets all of the requirements of the Canadian Interference­Causing Equipment Regulations. Cet appareil numérique de la Classe A respecte toutes
les exigences du Règlement sur le materiél brouilleur du Canada.

Controls Group

507 E. Michigan Street
P.O. Box 423 Printed in U.S.A.
Milwaukee, WI 53201

18 T600MEP-2 Programmable Economizer Thermostat Installation Instructions

www.johnsoncontrols.com