Echo 8870 User Manual

A PART OF THE APRILAIRE

INDOOR AIR COMFORT SYSTEM

AUTOMATED HVAC

THE BEST IN I NDOOR AIR COMFORT

Communicating Thermostat

System Installation Manual

This manual will guide the installer through the installation, wiring and checkout of an Aprilaire Model 8870 Communicating Thermostat System. Instructions for the Aprilaire 8840 Series communicating thermostat system are found in a separate document (DP 10004345). A portion of the command set is found in Appendix 2 in this manual. For a complete command set with programming suggestions, see the programming manual (DP 10005756). Contact Research Products Corporation for these documents at 888-782-8638.

COMMUNICATING THERMOSTAT SYSTEM INSTALLATION MANUAL

WARNING

1. 120 volts may cause serious injury from electrical shock. Disconnect electrical power to the HVAC system before starting installation. This system is a low-voltage system.

2. Improper installation may cause serious injury from electrical shock. This system must be installed by a qualified contractor in accordance with NEC Standards and applicable local and state codes.

THERE ARE 14 STEPS INVOLVED IN THE INSTALLATION OF A COMPLETE SYSTEM.

Step 1 GET ALL THE COMPONENTS YOU WILL NEED 1

Step 2 DISCONNECT POWER TO ALL HVAC EQUIPMENT AND/OR ZONE CONTROL PANELS 2

Step 3 RUN THE REQUIRED WIRES 3

Step 4 LOCATE AND MOUNT THE AUTOMATION SYSTEM COMPONENTS 4

Step 5 CONNECT THE CONTROL WIRES TO THE HVAC/ZONE SYSTEM AND THERMOSTATS 6

Step 6 CONNECT THE COMMUNICATION AND POWER WIRES TO THE DISTRIBUTION PANEL AND THERMOSTAT 8

Step 7 CONNECT MULTIPLE DISTRIBUTION PANELS 9

Step 8 CONNECT PROTOCOL ADAPTER TO THE DISTRIBUTION PANEL AND HOST COMPUTER OR AUTOMATION SYSTEM 10

Step 9 PROVIDE POWER TO THE DISTRIBUTION PANEL 11

Step 10 TURN ON POWER TO ALL HVAC EQUIPMENT AND TO THE THERMOSTATS 11

Step 11 CHECK-OUT HVAC SYSTEM OPERATION 11

Step 12 ADDRESS THE THERMOSTATS AND SET HIGHEST ADDRESS 12

Step 13 SETUP COMPUTER FOR COMMUNICATION SYSTEM CHECKOUT 13

Step 14 CHECK-OUT COMMUNICATIONS TO THE THERMOSTAT NETWORK 16

Appendix 1 SPECIAL CONSIDERATIONS FOR INSTALLING THE MODEL 8870 WITH THE 8840 SERIES

COMMUNICATING THERMOSTAT 17

Appendix 2 APRILAIRE COMMAND SET 19

EXTRA NETWORK INTERCONNECTION WORKSHEET 21

ILLUSTRATION 1 – System Components

Model 8870 Thermostat

RS-422 Communicating Thermostat controls single

or multi-stage heat/cool or heat pump HVAC systems.

Model 8811 Protocol Adapter

Use to convert RS-485 communication signal from Aprilaire

Communication System to RS-232 communication signal

readable by host computer. Supports up to 32 thermostats.

Model 8061 and 8062 Support Modules

Up to four can be connected to a single thermostat

to sense temperature or relative humidity at a

location remote from the thermostat.

Model 8818 Distribution Panel

Switches in the Distribution Panel allow power or

communications to be turned off at each individual

thermostat to make installation and troubleshooting easy.

RX TX

DATA

RS-232

RX TX

ENABLE

RS-485

RX TX

DATA

RS-485

POWER

Model 8811 Protocol Adapter

Power

7.5VAC RS-485 RS-485 RS-232

B+ B- REFA-

RCA+ A- B+ B- R CA+ A- B+ B- R CA+ A- B+ B- R CA+ A- B+ B-

A+

OFF ON

ON OFF

PWR

MAIN PWR

ON OFF

24VAC

FUSE SPARE FUSE

RCA+A-B+B-RCA+A-B+B-RCA+A-B+B-RCA+A-B+B-

COMPONENTS YOU WILL NEED… (see ILLUSTRATION 1)

• One Aprilaire

Model 8870 Communicating Thermostat for each

zone or single zone HVAC system

• One Aprilaire Model 8818 Distribution Panel per eight (8) thermostats in the system

• One Aprilaire Model 8811 Protocol Adapter per 32 thermostats or one per Model 8823 system controller

• 4 to 8 conductor thermostat cable depending on equipment stages (18 – 20 gauge)

• Category 5 communication wire (4-pair twisted cable)

• One 24V AC transformer, ungrounded (part number 8027) per

8818 Distribution Panel

• RS-232 or RS-485 based automation system such as the Aprilaire Model 8823 System Controller

• OPTIONAL: Aprilaire Model 8061 Temperature Support Module or Model 8062 Temperature/Humidity Support Module

GET ALL THE COMPONENTS YOU WILL NEED

Step1

TOOLS YOU WILL NEED…

• Small flat head screwdriver for terminal screws (1/8” wide tip)

• Medium size flat/phillips head screwdriver for component mounting screws

• Volt/ohm meter

• Computer with available com port (RS-232)

and terminal emulator such as HyperTerminal (for system checkout)

• Wire strippers

• Small level (use to mount components level,

required for appearance only)

MODEL 8870 THERMOSTAT

The Model 8870 Thermostat is field configurable to operate single and multi-stage separate heating and cooling equipment (such as furnace and air conditioner or roof top units), or single and multi-stage heat pump systems. A menu driven set up, using the message center display of the thermostat, can be used to configure many other features.

Network communication is non-isolated, full duplex RS-485 (RS-422). The ‘A’ terminals are the transmit pair while the ‘B’ terminals are the receive pair. This nomenclature uses the computer or host as the reference, so transmit refers to the lines on which the host transmits data to the thermostat while receive refers to the lines on which the host receives data from the thermostat. The baud rate is selectable between 9600 and 19200. Up to 64 uniquely addressed thermostats may reside on the same thermostat network.

MODEL 8818 DISTRIBUTION PANEL

The Distribution Panel is a switch controlled communication bus that can be wired to eight (8) Aprilaire Model 8870 thermostats. This allows thermostat communication (transmit, receive or both) to be turned on and off at one convenient location which simplifies installation and trouble shooting. Each thermostat station on the distribution panel has an on/off switch for power. This allows isolation of any one thermostat to simplify troubleshooting. Order one Distribution Panel per eight thermostats.

MODEL 8061 AND MODEL 8062 SUPPORT MODULES

Support modules are used to either monitor or control temperature or humidity at a location other than the thermostat. They communicate with the thermostat using a RS-485 protocol. Up to four support modules may be wired to a thermostat, with each module able to support two sensors. The Model 8061 has one onboard temperature sensor and room for one offboard temperature sensor (sensor #1 & sensor #2) while the Model 8062 has one onboard temperature sensor (sensor #1) and one onboard humidity sensor (sensor #2). All sensors can be configured as either a control sensor (replaces thermostat temperature sensor as control variable) or a monitor sensor (read only). An offboard sensor such as a Model 8051 Flush Mount Sensor can replace sensor #1 on the Model 8062 or both on the Model

8061. Each support module is addressed and each sensor value can be accessed through thermostat commands. See sensor literature for additional information.

FOR EASE OF INSTALLATION AND TROUBLE SHOOTING DO THE FOLLOWING:

✔ Use Category-5 cable for all communication wiring. ✔ Check and recheck to ensure connection to the proper

terminals before powering up the thermostats. Use wire color as a guide and be consistent.

✔ Use a Distribution Panel on all systems with more than

one zone. The trouble shooting benefits will outweigh the cost of the Distribution Panel.

• If the thermostats are wired to a zone control panel, there is generally one set of input terminals supplying power to the thermostats and dampers. This must be disconnected.

• If the thermostats are wired directly to HVAC equipment, the power must be shut off at the equipment. This can generally be accomplished by turning off the disconnect switch located near the equipment. If an obvious disconnect switch is unavailable, you will need to turn the circuit off using the fuse or circuit breaker. Remove the fuse or shut down the circuit breaker serving the equipment.

DISCONNECT POWER TO ALL HVAC EQUIPMENT AND/OR ZONE CONTROL PANELS

Step 2

CAUTION

Failure to disconnect power could result in damage to the HVAC equipment or thermostats. Leave power disconnected until all other electrical connections have been made and checked for accuracy.

ILLUSTRATION 2 – Run Wire For System

RUN THE REQUIRED WIRES

(SEE ILLUSTRATION 2)

Step 3

1. Run thermostat cable from each thermostat to the

appropriate HVAC system or zone control panel. Use 4 through 8-conductor thermostat cable depending on the type of equipment and number of equipment stages. Run one more wire than would be required if connecting to a mechanical thermostat.

❖ If you are using remote temperature or humidity

support modules as part of your installation, now is the time to run the additional wires for these items. A separate Category 5 cable must be run from thermostat to support module.

2. At the HVAC/zone control system, use a piece of tape to

✍

label the location of the thermostat on the cable as you go.

3. Run Category-5, 4-pair twisted cable (8-conductor) from each thermostat to the Distribution Panel.

4. At the Distribution Panel, use a piece of tape to

✍

label

the location of the thermostat on the cable as you go.

5. Run Category-5 wire from the Distribution Panel to the Protocol Adapter. If more than one Distribution Panel is used, run Category-5 wire between each panel.

6. Run two-conductor thermostat cable from the Model 8027 Transformer to the Distribution Panel. You can use Category-5 wire, but you must use one pair of wires per terminal.

ZONE DAMPERS

2-WIRE THERMOSTAT CABLE

SINGLE ZONE

HVAC EQUIPMENT

SEE ZONE CONTROL SYSTEM

INSTALLATION LITERATURE

FOR COMPLETE ZONE

SYSTEM WIRING REQUIREMENTS

INSTALLATION TIP: USE A PIECE OF TAPE TO IDENTIFY WHICH THERMOSTAT EACH CABLE IS RUN TO

USE 2-WIRE THERMOSTAT

CABLE TO CONNECT OFF-

BOARD SENSORS SUCH AS

THE MODEL 8051 FLUSH

MOUNT SENSOR TO

SUPPORT MODULES.

2-WIRE THERMOSTAT CABLE

MODEL 8027 PLUG-IN

TRANSFORMER

(FOR COMMUNICATION SYSTEM)

THERMOSTAT 1

THERMOSTAT 2

4000 FT.

MAX.

4000 FT. MAX.

POWER

Model 8811 Protocol Adapter

Power

7.5VAC RS-485 RS-485 RS-232

DATA RS-485

ENABLE

RS-485

DATA

RS-232

RX TX

ZONE CONTROL SYSTEM

DISTRIBUTION PANEL

4000 FT. MAX.

1000 FT.

MAX.

4000 FT.

MAX.

4000 FT. MAX.

CATEGORY 5 (4-PAIR TWISTED) COMMUNICATION WIRE

NOTE: TOTAL DISTANCE FROM PROTOCOL ADAPTER TO THERMOSTAT NOT TO EXCEED 4,000 FEET

THERMOSTAT CABLE 5 thru 8 CONDUCTOR

SUPPORT MODULE

THERMOSTAT 3

THERMOSTAT 4

1. Thermostats and sensors are to be located according installation instructions provided with the units. The

thermostat has four configuration dip switches on the circuit board that must be set according to the equipment the thermostat will be controlling. Sensors have six configuration dip switches that must be properly set.

The installation manuals provided with the products detail how the switches are to be set.

Review the Network Interconnection Worksheet (ILLUSTRATION 3) which shows how all the communication components are connected together and

✍

write down the location of, or a name for, each thermostat in the system. This will assist in the software set-up. Additional copies are available in the back of this manual.

✍

IMPORTANT!

THE FEW MINUTES SPENT WRITING DOWN

THE INFORMATION SUGGESTED IN THESE STEPS

WILL SAVE A TREMENDOUS AMOUNT OF TIME

DURING THE REST OF THE INSTALLATION.

2. Mount the zone control panel(s) if the HVAC system(s) is zoned. Refer to the zone control panel installation instructions.

3. The Aprilaire Distribution Panel must be mounted indoors in an accessible location such as a closet or utility room. All thermostats will be wired to the Distribution Panel, so adequate workspace will be important. There are wire access holes on the top, bottom, sides and back of the Distribution Panel.

4. The Model 8811 Aprilaire Protocol Adapter must be placed within six feet of the host computer or RS-232 port of the automation system. The Protocol Adapter does not get fastened down. All the cables and connectors needed to attach the Protocol Adapter to the computer or automation system are included with the adapter.

5. The Model 8027 Plug-in Transformer is used to power the communication system. The transformer is wired to the Distribution Panel. Locate this transformer in the same space as the Distribution Panel if possible.

LOCATE AND MOUNT THE AUTOMATION SYSTEM COMPONENTS

Step 4

ILLUSTRATION 3 – Network Interconnection Worksheet

ADDRESS

LOCATION

WIRE

CAT-5

WIRE

CAT-5

ADDRESS

LOCATION

CAT-5

WIRE

ADDRESS

LOCATION

CAT-5

WIRE

RX TX

POWER

DATA

ENABLE

DATA

RS-232

RS-485

Model 8811 Protocol Adapter

Power

7.5VAC RS-485 RS-485 RS-232

ADDRESS

LOCATION

DISTRIBUTION PANEL LOCATION / NAME

JOB TITLE:

JOB LOCATION:

DATE:

INSTALLING

CONTRACTOR:

Fill Out and Leave with System Software Package

WIRE

CAT-5

WIRE

CAT-5

WIRE

DISTRIBUTION PANEL

CAT-5

WIRE

CAT-5

WIRE

CAT-5

TO DISTRIBUTION PANEL

ADDRESS

LOCATION

ADDRESS

LOCATION

ADDRESS

LOCATION

ADDRESS

LOCATION

A qualified HVAC technician should perform this step to ensure proper termination.

1. Make sure the HVAC system power is off.

2. The Thermostat Installation Instructions show wiring diagrams for several different HVAC equipment types. Use DIAGRAMS 1 & 2 as a reference only. Use color coding where possible.

DO NOT TURN ON

THE HVAC SYSTEM

POWER YET!

CONNECT THE CONTROL WIRES TO THE HVAC/ZONE SYSTEM AND THERMOSTATS

Step 5

DIAGRAM 2 – Typical Heat Pump Wiring Schematic

DIAGRAM 1 – Typical Heating / Cool Wiring Schematic

MULTI-STAGE FURNACE

2ND

STAGE

HEAT

FAN

RELAY

2ND STAGE

1ST STAGE

1ST

STAGE

HEAT

VAC

120

VAC

COOL

MULTI-STAGE A/C

2ND

1ST

STG

COOL

STG

COOL

CAUTION!

ENSURE HVAC SYSTEM POWER

IS OFF BEFORE WIRING

USE 18-20 GA. THERMOSTAT CABLE. NUMBER OF CONDUCTORS REQUIRED DEPENDS ON THE HVAC SYSTEM BEING CONTROLLED

C R RSR RSC RSB RSA REF

BB+ AA+

R.V.-Heat (B)R.V.-Heat (B)

REFER TO THE THERMOSTAT INSTALLATION SHEET FOR INTERNAL SCHEMATIC, THERMOSTAT CHECK-OUT

PROCEDURES AND OTHER HVAC WIRING DETAILS

RC RH

R.V.-Cool (O)R.V.-Cool (O)

HUM W1

DEH Y1

OUTDOOR HEAT PUMP UNIT

USE 18-20 GA. THERMOSTAT CABLE. NUMBER OF CONDUCTORS REQUIRED DEPENDS ON THE HVAC SYSTEM BEING CONTROLLED

REV

VALV E

HEAT

CAUTION!

ENSURE HVAC SYSTEM POWER

IS OFF BEFORE WIRING

INDOOR BLOWER/HEAT UNIT

2ND

STAGE

AUX.

HEAT

1ST

STAGE

AUX.

FAN

RELAY

REFER TO THE THERMOSTAT INSTALLATION SHEET FOR INTERNAL SCHEMATIC, THERMOSTAT CHECK-OUT PROCEDURES AND OTHER HVAC WIRING DETAILS

HEAT

VAC

120

VAC

COMP.

1ST

STG

COMP.

2ND STG

C R RSR RSC RSB RSA REF

BB+ AA+

R.V.-Heat (B)R.V.-Heat (B)

VALV E

REV

COOL

R.V.-Cool (O)R.V.-Cool (O)

SERVICE

RC RH

HUM W1

DEH Y1

DEFROST

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