Aprilaire 8620 User Manual

Model 8620 Thermostat with

™

Event-Based

Air Cleaning and

Humidity or Ventilation Control

Safety &

Installation

Instructions

READ AND SAVE THESE INSTRUCTIONS

TABLE OF CONTENTS

INSTALLATION

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

Outdoor temperature sensor (included).............2

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

Thermostat mounting...........................3

Power & reset options..........................4

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

WIRING DIAGRAMS

Conventional heat/cool single transformer..........5

Conventional heat/cool two transformer ...........5

Heat pump single transformer....................5

Heat pump two transformer .....................5

Indoor Air Quality equipment – dehumidifier . . . . . . . . 6

Indoor Air Quality equipment – humidifier . . . . . . . . . . 6

Indoor Air Quality equipment – ventilation..........6

SETUP & TESTING

Equipment type selection switch (SW1) ............7

Installer setup menu ...........................7

Change system settings.........................7

HVAC installer system settings table ............8-9

Indoor Air Quality system settings tables..........10

Air cleaning sytem settings table ..............10

Humidifier system settings table ...............10

Dehumidifier system settings table .............11

Ventilation system settings table............11-12

Climate map for ASHRAE fresh air setup ..........12

Removal of Indoor Air Quality control buttons ......13

System test menu .........................13-14

System test tables.........................15-16

REFERENCES

Quick reference to controls & display.............17

Troubleshooting ..............................18

Error codes ..................................19

Thermostat features ..........................19

Specifications................................20

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.

OUTDOOR TEMPERATURE SENSOR (INCLUDED)

Outdoor temperature can be measured by attaching the included 8052 sensor to the S1 and S2 terminals. The outdoor sensor must be enabled in the installer setup menu.

Heat pump models can use the outdoor temperature to effectively utilize the 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 provide heating.

Indoor Air Quality functions can use the outdoor temperature sensor to:

• Control humidification setpoint based on outdoor temperature to prevent condensation

• Lock out humidification for temperatures over 60°F or below -30°F.

• Lock out ventilation based on high and/or low outdoor temperatures.

• Display outdoor temperature on thermostat.

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.

REMOTE TEMPERATURE SENSOR (OPTIONAL)

A remote temperature sensor can be used if the thermostat has 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 setup menu. When the remote sensor is installed it overrides the internal 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.

O/B

CI2

T2T1

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.

O/B

CI2

2 3

T2T1

INSTALLATION

POWER & RESET OPTIONS

The thermostat is dual power. It can either be AC or

battery powered, or both (to provide backup power for the clock). Batteries are optional if your thermostat was

wired to run on AC power when installed.

For heat pump systems the C terminal must be connected

to the common of the 24VAC transformer in order for the system fault and emergency heat indicators to operate.

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.

Note: The reset button is disabled when the thermostat is removed from the wall for programming.

WIRING TERMINAL

C I2

I1 Y

O/BRC

Y2 W2

Wire specifications:

18-24 gauge thermostat wire

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.

RESET BUTTON

I1 & I2 – Indoor Air Quality control output

C – Common (optional when powered by batteries)

O/B – Reversing valve

Y – 1st stage cooling / compressor

Y2 – 2nd stage cooling / compressor

G – Fan

RC – 24VAC supply cooling

R – 24VAC supply heating

W2 – 2nd stage heat / auxiliary

W – 1st stage heat / auxiliary

L – System fault indicator (optional) (heat pump only)

S1 & S2 – outdoor temperature sensor (included)

T1 & T2 – remote temperature sensor (optional)

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

CONVENTIONAL HEAT/COOL WIRING DIAGRAMS

SINGLE TRANSFORMER (USE JUMPER WIRE) TWO TRANSFORMERS (REMOVE JUMPER WIRE)

HEATING

TRANSFORMER

FAN

1st COOLING

2nd COOLING

NOT USED

GY2YO/BI1 WRC RW2S2LCI2 S1 T1 T2

2nd HEATING

JUMPER

1st HEATING

NOT USED

SENSOR

OUTDOOR TEMP

REMOTE TEMP

SENSOR

1st COOLING

2nd COOLING

NOT USED

GY2YO/BI1 WRC RW2S2LCI2 S1 T1 T2

TRANSFORMER

COOLING

TRANSFORMER

FAN

2nd HEATING

1st HEATING

NOT USED

SENSOR

OUTDOOR TEMP

REMOTE TEMP

HEAT PUMP WIRING DIAGRAMS

SINGLE TRANSFORMER (USE JUMPER WIRE) TWO TRANSFORMERS (REMOVE JUMPER WIRE)

HEATING

TRANSFORMER

HEAT PUMP

TRANSFORMER

FAN

1st COMPRESSOR

REVERSING VALVE

2nd COMPRESSOR

GY2YO/BI1 WRC RW2S2LCI2 S1 T1 T2

2nd AUX HEATING

JUMPER

1st AUX HEATING

FAULT DETECT

SENSOR

OUTDOOR TEMP

REMOTE TEMP

SENSOR

1st COMPRESSOR

REVERSING VALVE

HEAT PUMP

TRANSFORMER

FAN

2nd COMPRESSOR

GY2YO/BI1 WRC RW2S2LCI2 S1 T1 T2

2nd AUX HEATING

1st AUX HEATING

FAULT DETECT

SENSOR

OUTDOOR TEMP

REMOTE TEMP

SENSOR

4 5

HC HP

GY2YO/BI1 WRC RW2S2LCI2 S1 T1 T2

INSTALLATION

SETUP & TESTING

INDOOR AIR QUALITY EQUIPMENT WIRING DIAGRAMS

DEHUMIDIFIER WIRING HUMIDIFIER WIRING

TRANSFORMER

DEHUMIDIFIER

HUMIDIFIER

VENTILATION WIRING

TRANSFORMER

EQUIPMENT TYPE SELECTION SWITCH (SW1)

This thermostat has the option of being used in heat pump or heat/cool systems. Switch SW1 located on the

back of the thermostat’s face is used to select this option.

This setting is displayed in the Installer System Settings

SW1

HEAT/COOL HEAT PUMP

under Equipment Type.

Note: Thermostat reboots within 10 seconds after switch position is changed.

HC HP

INSTALLER SETUP MENU

HOW TO ENTER THE INSTALLER SETUP MENU AND SELECT EQUIPMENT TO SETUP:

In the Installer Setup, HVAC or Indoor Air Quality setup can be selected. If Indoor Air Quality setup is selected, the user can then select to set up Air Cleaning, Humidification, Dehumidification or Ventilation.

Press [MODE] to set system to OFF.

Press [MENU] to enter main menu.

Press and hold [SETUP] for seven seconds, [INSTALL SETUP] appears.

Press [INSTALL SETUP] to enter installer setup menu.

Press

or to adjust the option.

Press [MENU] to exit.

Press [NEXT] to select option.

If IAQ (Indoor Air Quality) was selected, Press

to adjust the Outdoor Sensor setting or IAQ (Indoor

Air Quality) option.

Press [NEXT] to select Outdoor Sensor setting or IAQ (Indoor Air Quality) option.

System Settings can now be changed.

NORMALLY CLOSED DAMPER

GY2YO/BI1 WRC RW2S2LCI2 S1 T1 T2

Note: The I1/I2 output is a dry contact closure. The humidifier wiring diagram assumes the control is powering a solenoid valve. The dehumidifier wiring diagram is for a normally open dry contact input. The ventilation diagram

assumes the control is for a normally closed damper. Please see the individual humidifier, dehumidifier or ventilation

installation instructions for product specific wiring details.

CHANGE SYSTEM SETTINGS

SETTING

SETTING OPTIONS

DESCRIPTION

SETTING NUMBER

Press [NEXT] or [BACK] to page through the settings.

Press

or to adjust the setting.

Press [DONE] to save and exit, or [CANCEL] to exit

without saving.

The thermostat will discard changes and exit if nothing

is pressed within 60 seconds.

To reset the installer settings to the default, reset

the thermostat by pressing the [RESET] button for 5 seconds.

6 7

+ 7 hidden pages

Aprilaire 8620 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual