Unit installation

Installation and Maintenance Manual IM 1015
MTA 158 Microprocessor Thermostat
On/Off Controller
Group: Applied Air Systems
Part Number: 910102990
Date: August 2009
© 2009 Daikin 800-432-1342 www.DaikinApplied.com
Page 51
IM 1015 - MT 158 and MT 168 Digital Thermostats
Installation
1 Install the thermostat 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.
Figure 1: Wiring Diagram for On/Off Ouput Configuration
Table 1: MTA 158 Operation*
Note: * Operation determined by configuration. See Dip Switch
Configuration Table.
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.
DANGER
READ THESE INSTRUCTIONS CAREFULLY BEFORE
ATTEMPTING TO INSTALL, OPERATE OR SERVICE
THIS THERMOSTAT.
Failure to observe safety information and comply with
instructions could result in PERSONAL INJURY, DEATH
AND/ OR PROPERTY DAMAGE.
To avoid electrical shock or damage to equipment,
disconnect power before installing or servicing. Use only
wiring with insulation rated for full thermostat operating
voltage. Use copper wire only. Insulate or wirenut all un-
used leads. Any wiring, including the remote probe,may
carry the full operating voltage of the thermostat.
To avoid potential fire and/ or explosion do not use in
potentially flammable or explosive atmospheres.
Retain these instructions for future reference. You must
review your application and national and local codes to
ensure that your installation will be functional and safe.
CAUTION
Care should be used to avoid electrostatic discharge to
the microprocessor.
This unit has configuration jumpers. You may need to
reconfigure this thermostat for your application.
Output Off with Demand On with Demand
Main 1
Terminal 10
On at temperature
demand
On at Temperature
Demand
Main 2 (Terminal
12)
NA NA
Secondary
(Terminal 11)
Summer: Off with heat
demand
Winter: Disabled
Summer: On wtih
heat demand
Summer: Disabled
Secondary 2
(Terminal 13)
NA NA
LOW VOLTAGE
CONNECTIONS
LINE VOLTAGE
CONNECTIONS
FAN
L2 OR NEUTRAL
REMOTE PROBE
PIPE SENSOR
L1 (HOT)
LO
MED
HIGH
OR SINGLE SPEED FAN
24 VAC 1
24 VAC 2
SETBACK INPUT
24 VAC
XFMR
MAIN 1
SEC 1
MAIN 1
OUTPUT
SECONDARY
1 OUTPUT
10
11
12
13
14
15
16
17
1
2
3
4
5
6
7