Aprilaire 8800 User Manual

Model 8800 Universal

Communicating Thermostat

Safety &

Installation

Instructions

READ AND SAVE THESE INSTRUCTIONS

TABLE OF CONTENTS

INSTALLATION

Installation location recommendations.............2

Thermostat mounting...........................2

Outdoor temperature sensor (optional) .............2

Remote temperature sensor (optional) .............3

Power & reset options..........................3

Wiring terminal ...............................4

Wiring diagrams ............................5-7

SETUP & TESTING

Equipment type selection switch (SW1) ............8

Installer setup menu ...........................8

Installer system settings table ................9-11

System test menu ............................12

System test tables............................13

REFERENCES

Quick reference to controls & display..........14-15

Thermostat features ..........................16

Troubleshooting ..............................17

Error codes ..................................18

Specifications................................19

INSTALLATION

INSTALLATION LOCATION RECOMMENDATIONS

Thermostat should be mounted:

• On an interior wall, in a frequently occupied space.

• Approximately 5‘ above floor.

• At least 18” from outside wall.

• Thermostat can be mounted to a vertical junction box.

Do not mount thermostat:

• Behind doors, in corners or other dead air spaces.

• In direct sunlight, near lighting fixtures, or other appliances that give off heat.

• On an outside or unconditioned area wall.

• In the flow of a supply register, in stairwells, or near

outside doors.

• On a wall with concealed pipes or ductwork.

THERMOSTAT MOUNTING

1. Remove the rear mounting plate from the thermostat.

2. Pull wires through the opening on the back of the thermostat.

3. Position and level the mounting plate of the thermostat

on wall and mark the hole locations with a pencil.

4. Drill 1/4” holes and insert supplied anchors (drywall only).

5. Place mounting plate over anchors, insert and tighten

screws.

6. Seal wire entry holes to prevent drafts affecting

temperature readings.

OUTDOOR TEMPERATURE SENSOR (OPTIONAL)

Outdoor temperature can be measured by attaching an 8052 sensor to the S1 and S2 terminals. The outdoor sensor

must be enabled in the installer setup menu.

In heat pump mode the outdoor temperature sensor can be used to efficiently utilize an air source heat pump:

• When the outdoor temperature is less than the Low Balance Point, the heat pump will be locked out and only auxiliary heating will be used.

• When the outdoor temperature is higher than the High Balance Point, the auxiliary heating will be

locked out and only the heat pump will be used to

Outdoor temperature sensor should be mounted:

• On side of building out of direct sunlight (north side

recommended).

• Above snow line.

• At least 3’ away from exhaust vents and condensing

lines.

• Using less than 300’ of wire.

• Do not route wires along 120 VAC lines.

provide heating.

REMOTE TEMPERATURE SENSOR (OPTIONAL)

A remote temperature sensor can be used if the thermostat is to be mounted in a concealed location. A 8051 flush mount or 8053 surface mount remote temperature sensor can be attached to the T1 and T2 terminals and mounted in a recommended area. The remote sensor must be enabled in the installer set-up menu, and once enabled will override the thermostat’s internal temperature sensor.

Remote temperature sensor should be mounted:

• On an interior wall, in a frequently occupied space.

• Approximately 5‘ above floor.

• At least 18” from outside wall.

• Using less than 300’ of wire.

Do not mount remote sensor:

• Behind doors, in corners or other dead air spaces.

• In direct sunlight, near lighting fixtures, or other appliances that give off heat.

• On an outside or unconditioned area wall.

• In the flow of a supply register, in stairwells, or near

outside doors.

• On a wall with concealed pipes or ductwork.

• Near 120 VAC lines.

B+ A+ B- A-

W2RH

RC WBOYY2G

T2T1S1

RSARSB

POWER & RESET OPTIONS

The thermostat is a 24VAC powered device with a battery back-up for the clock.

The thermostat has a memory backup that saves the thermostat settings in case of a power interruption. The system settings will be retained but the clock will reset after 90 seconds with no battery or AC power.

The reset button located under the battery cover can be used to reset the thermostat to factory defaults. The system

settings will also be reset to default.

W2RH

B+ A+ B- A-

2 3

RC WBOYY2G

T2T1S1

RSARSB

INSTALLATION

THERMOSTAT IS POWERED

INSTALLATION

WIRING TERMINAL

B+

A+ A-

B-

BYORC RH

Wire specifications:

18-24 gauge thermostat wire

CAT-5 or equivalent for communication terminals

Installation notes:

• Ensure power at the HVAC equipment is off.

• Loosen screw terminals, insert stripped wire and

re-tighten.

• Push the excess wire back into the opening and plug the wall opening to prevent drafts.

Note: If the HVAC system was installed before the automation system, the HVAC installer may have

powered the thermostat connecting a wire to the C terminal and installing a jumper wire from the R terminal to RH or RC. When used with an automation system, the R and C terminals on the Model 8800 thermostat should only be connected to the same

terminals on the 8819 or a dedicated 24VAC transformer.

There should be no connection to the R or C terminals

coming from the HVAC equipment.

RT2

B+ / B- – Receive communication terminal (reference automation system)

A+ / A- – Transmit communication terminal (reference automation system)

RSARSB

C – 24VAC Thermostat power (common) from 8819

R – 24VAC Thermostat power (hot) from 8819

B – Reversing valve for heat

O – Reversing valve for cool

Y – 1st stage cooling / compressor or dehumidifier3

Y2 – 2nd stage cooling / compressor

G – Fan

RC – 24VAC supply cooling

RH – 24VAC supply heating

W2 – 2nd stage heat / auxiliary / E-Heat

W – 1st stage heat / auxiliary / E-Heat / humidifier

S1 & S2 – outdoor temperature sensor (optional)

T1 & T2 – remote temperature sensor (optional)

RSA & RSB – 8081 or 8082 Support Module

communication (half duplex)

Refer to Aprilaire HVAC Automation System Installation Manual for communication wiring details.

O and B terminals are both de-energized when system mode is OFF or in AUTO when the heating and cooling equipment is idle.

When the unit is configured for humidistat mode.

Jumper between RC & RH is used in single transformer systems (see wiring diagrams).

Refer to Support Module literature for wiring details.

CONVENTIONAL HEAT/COOL

SINGLE TRANSFORMER (USE JUMPER WIRE)

THERMOSTAT IS POWERED FROM 8819 OR 24VAC TRANSFORMER

TRANSFORMER

COMMUNICATION

TERMINALS

NOT USED

FAN

1st COOLING

2nd COOLING

GY2YO

JUMPER

RC RH W2

2nd HEATING

1st HEATING

SENSOR

OUTDOOR TEMP

S2R

SENSOR

REMOTE TEMP

SUPPORT MODULE

1T1T2A-B-A+B+

RSB RSA

TWO TRANSFORMERS (REMOVE JUMPER WIRE)

FROM 8819 OR 24VAC TRANSFORMER

HEATING

TRANSFORMER

COOLING

TRANSFORMER

COMMUNICATION

TERMINALS

NOT USED

FAN

1st COOLING

2nd COOLING

GY2YO

RC RH W2

2nd HEATING

1st HEATING

SENSOR

OUTDOOR TEMP

S2R

SENSOR

REMOTE TEMP

SUPPORT MODULE

1T1T2A-B-A+B+

RSB RSA

4 5

INSTALLATION

THERMOSTAT IS POWERED

INSTALLATION

HEAT PUMP

COMMUNICATION

TERMINALS

SINGLE TRANSFORMER (USE JUMPER WIRE)

FROM 8819 OR 24VAC TRANSFORMER

HEAT PUMP

TRANSFORMER

1st COMPRESSOR

REVERSING VALVE

FAN

2nd COMPRESSOR

JUMPER

2nd AUX HEATING

OUTDOOR TEMP

1st AUX HEATING

GY2YO

RC RH W2

S2R

NOTE: “O” is active in cooling and “B” is active in heating.

TWO TRANSFORMERS (REMOVE JUMPER WIRE)

FROM 8819 OR 24VAC TRANSFORMER

HEATING

TRANSFORMER

HEAT PUMP

TRANSFORMER

1st COMPRESSOR

REVERSING VALVE

FAN

2nd COMPRESSOR

2nd AUX HEATING

OUTDOOR TEMP

1st AUX HEATING

SENSOR

1T1T2A-B-A+B+

SENSOR

REMOTE TEMP

SUPPORT MODULE

RSB RSA

SENSOR

REMOTE TEMP

SUPPORT

MODULE

HUMIDISTAT

COMMUNICATION

TERMINALS

DRY CONTACT

DEHUMIDIFIER

GY2YO

RC RH W2

POWERED CONTACT

HUMIDIFIER

DEHUMIDIFIER

TRANSFORMER

GY2YO

RC RH W2

TRANSFORMER

FROM 8819 OR 24VAC TRANSFORMER

HUMIDIFIER

S2R

1T1T2A-B-A+B+

THERMOSTAT IS POWERED FROM 8819 OR 24VAC TRANSFORMER

HUMIDIFIER

S2R

1T1T2A-B-A+B+

SUPPORT MODULE

RSB RSA

SUPPORT MODULE

RSB RSA

GY2YO

RC RH W2

S2R

1T1T2A-B-A+B+

RSB RSA

NOTE: “O” is active in cooling and “B” is active in heating.

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