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

C

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0

Aux

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4

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