Daikin BACnet IM 1248 Manual de usuario

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

IM 1248 • BACNET THERMOSTAT 2 www.DaikinApplied.com

InsTallaTIon GuIde – HeaT PumP

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

InsTallaTIon GuIde – HeaT PumP

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.

IM 1248 • BACNET THERMOSTAT 4 www.DaikinApplied.com

InsTallaTIon GuIde – HeaT PumP

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

InsTallaTIon GuIde – HeaT PumP

www.DaikinApplied.com 5 IM 1248 • BACNET THERMOSTAT

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.

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.

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