Daikin BACnet IM 1248 User manual

Installation Guide IM 1248
Group: Controls
Part Number: IM 1248
Date: August 2015
BACnet®Thermostat
for Heat Pump Units
Table of ConTenTs
Installation Guide – Heat Pump..................2
Applicable Models ............................2
Mounting the BACnet Thermostat................2
Rough-in Preparation........................2
Installing the BACnet Thermostat ..............3
Connecting Inputs ............................3
Remote Space Temperature Sensor (optional) ....3
Fan Status Switch (optional) ..................3
Outside Air Temperature .....................3
Discharge Air Temperature....................3
Connecting Outputs ..........................4
Connecting Power............................4
Maintenance ................................5
Specications ...............................5
Additional Resources .........................5

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Applicable Models
This installation sheet applies to Heat Pump BACnet
Thermostats. Additional information can be found in IM 1234
BACnet Thermostat Installation and Operation Manual.
Mounting the BACnet Thermostat
CAUTION
Can cause equipment damage.
To prevent mounting screw heads from touching the circuit
board in the controller, use only the mounting screw supplied
by Daikin Applied. Using screws other than the type supplied
may damage the BACnet Thermostat.
For the most accurate performance, install the BACnet
Thermostat on an inside wall where it can sense the average
room temperature. Avoid locations with direct sunlight, heat
sources, windows, air vents, and air circulation or obstructions
such as curtains, furniture, etc.
The BACnet Thermostat must not be:
• Mounted on an exterior wall
• Mounted on or near an object with a large thermal mass
such as a concrete block wall
• Blocked from normal air circulation by obstructions
• Exposed to heat sources such as lights, computers,
copiers, or coffee makers, or to direct sunlight at any time
of the day
• Exposed to drafts from windows, diffusers, or returns
• Exposed to air ow through connecting conduits or empty
spaces behind walls
Rough-in Preparation
Complete rough-in wiring at each location before mounting a
BACnet Thermostat. This includes the following steps.
• Install the supplied mounting base directly to a wall, a
vertical electrical box, or a box with a wall plate kit
• Routing the connecting cable or cables from the BACnet
Thermostat to the equipment it is controlling
• Block leaks and airow from conduits with plumber’s putty
or similar material
• If replacing an existing thermostat, label existing wires for
reference when removing the existing thermostat
Figure 1: BACnet Thermostat Mounting Base Details

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www.DaikinApplied.com 3 IM 1248 • BACNET THERMOSTAT
Installing the BACnet Thermostat
To install the controller on a mounting base, do the following:
1. Turn the Allen screw in the base of the sensor clockwise
until it clears the case (Figure 2).
2. Swing the BACnet Thermostat away from the mounting
base to remove it.
3. Route wiring for the BACnet Thermostat through the
mounting base.
4. Position the base with the embossed UP toward the
ceiling and fasten it directly to a vertical 2 × 4 inch
electrical box.
5. Connect the wires for the BACnet Thermostat to the
terminals in the mounting base.
6. Place the top of the sensor over the top of the mounting
base and swing it down over the Allen screw bracket. Be
careful not to pinch any wiring.
7. Turn the Allen screw counterclockwise until it backs out
of the mounting base and engages the case (Figure 3).
Figure 2: Removing Allen Screw from Base
Figure 3: Reconnecting Allen Screw to Base
Connecting Inputs
The inputs for the BACnet Thermostat are congured for
specic functions and do not require set up in the eld. Not all
inputs are required for every application.
Figure 4: Heat Pump Inputs
Remote Space Temperature Sensor (optional)
Connect a 10kΩ, Type II thermistor temperature sensor to
the remote space temperature (RS) input and ground (GND)
terminals. The input includes the internal pull-up resistor.
Follow the instructions supplied with the sensor for installation.
When a remote space temperature input is connected to the
BACnet Thermostat, the remote temperature is used instead of
the internal temperature sensor.
Fan Status Switch (optional)
Connect a Normally Closed Fan Status switch to the Discharge
Air Temperature (DAT) input and ground (GND) terminals.
The input includes the internal pull-up resistor. Follow the
instructions supplied with the switch for installation.
Outside Air Temperature
Connect a 10kΩ, Type II thermistor temperature probe to the
outside air temperature (OAT) input. The input includes the
internal pull-up resistor. Follow the instructions supplied with
the sensor for installation.
Discharge Air Temperature
Connect a 10kΩ, Type II thermistor temperature probe to the
discharge air temperature (DAT) input. The input includes the
internal pull-up resistor. Follow the instructions supplied with
the sensor for installation.

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Connecting Outputs
WARNING
Can cause equipment damage.
Improperly connecting loads or equipment to output terminals
may damage the equipment. Connect only as shown in the
following diagrams or application drawings.
The BACnet Thermostat outputs are product dependent and
are congured for specic applications.
• No eld programming or set up is required or possible.
• Depending on model and application, the BACnet
Thermostat outputs are designed for either 24 volt AC or
0-10 volt DC loads.
• The outputs may represent analog or digital signals.
Figure 5: Heat Pump Output Terminals
Connecting Power
The BACnet Thermostat requires an external, 24 volt AC
power source. Use the following guidelines when choosing
and wiring transformers.
• Use only a Class-2 transformer of the appropriate size to
supply power.
• Daikin Applied recommends powering the BACnet
Thermostat from a dedicated controls transformer.
• Connect the transformer’s neutral lead to the COM
terminal.
• Connect the AC phase lead to the 24VAC terminal.
• Power is applied to the controller when the transformer
is powered.
Figure 6: Wiring for BACnet Thermostat Power

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Maintenance
Remove dust as necessary from the holes in the top and bottom.
Clean the display with a soft, damp cloth and mild soap.
Specications
BACnet Thermostat specications are subject to change
without notice.
Supply Voltage:
24 volts AC (-15%, +20%)
50-60 Hz, 12 VA,
Class 2 only
Inputs: 0-12 volts DC with internal 10kΩ pull-up resistors
Relay Outputs: SPST, 24 volts, 1 amp AC or DC
Maximum for all relay outputs is 3 amps
Analog Outputs: Short protected 10mA 0-12 VDC
Environmental Limits:
Operating 34 to 125°F (1.1 to 51.6°C)
Shipping -40 to 140°F (-40 to 60°C)
Humidity 0 to 95% RH (non-condensing)
Regulatory:
UL 916 Energy Management Equipment
FCC Class A, Part 15 Subpart B and complies with
Canadian ICES-003 Class A
This device complies with part 15 of the FCC Rules. Operation
is subject to the following two conditions: (1) This device may
not cause harmful interference, and (2) this device must accept
any interference received, including interference that may
cause undesired operation.
Additional Resources
For detailed specications, installation, operating, application,
and system integration information, see IM 1234 BACnet
Thermostat Installation and Operation Manual.

IM 1248 (08/15) ©2015 Daikin Applied | (800) 432–1342 | www.DaikinApplied.com
Daikin Applied Training and Development
Now that you have made an investment in modern, efcient Daikin equipment, its care should be a high
priority. For training information on all Daikin HVAC products, please visit us at www.DaikinApplied.com
and click on Training, or call 540-248-9646 and ask for the Training Department.
Warranty
All Daikin equipment is sold pursuant to its standard terms and conditions of sale, including Limited
Product Warranty. Consult your local Daikin Applied representative for warranty details. To nd your
local Daikin Applied representative, go to www.DaikinApplied.com.
Aftermarket Services
To nd your local parts ofce, visit www.DaikinApplied.com or call 800-37PARTS (800-377-2787).
To nd your local service ofce, visit www.DaikinApplied.com or call 800-432-1342.
This document contains the most current product information as of this printing. For the most up-to-date
product information, please go to www.DaikinApplied.com.
Products manufactured in an ISO Certied Facility.