Installation Instructions
Issue Date January 19, 2005
© 2005 Johnson Controls, Inc.
1
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.
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.
Part No. 24-9889-150, Rev. A
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