Aprilaire 8870 User Manual

Operating Instructions

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Aprilaire®Communicating Thermostat

Model 8870

CAUTION: Do not set to OFF mode during periods when

freezing temperatures could occur.

Thank you for your recent purchase of an Aprilaire®Communicating Thermostat. With this purchase, you have invested in the highest quality thermostat currently available.

This Model 8870 Communicating Thermostat operates similarly to a conventional thermostat but has the unique capability of being controlled, either locally or remotely (from a home automation system). The Model 8870 thermostat is capable of integration into your home automation system or independently operated with the Aprilaire Model 8825 System Controller.

Note: This manual covers basic operation of the thermostat,

which may be altered by the home automation system setup.

OPERATING INSTRUCTIONS – OWNERS MANUAL

TABLE OF CONTENTS

Getting Familiar With The Aprilaire Thermostat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Operating The Thermostat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

1. Select The Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

2. Setting Temperatures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

3. Fan Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

4. Backlight Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

5. Network Override . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

6. Clearing A Temporary Flashing Message . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Thermostat Set-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

In Case Of Power Failure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13

Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13

Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14 –16

Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17

GETTING FAMILIAR WITH THE APRILAIRE THERMOSTAT (

refer to Figure 1

)

MESSAGE DISPLAY – Two types of messages are displayed; permanent and temporary. Permanent messages scroll continually. This includes the three default status messages (i.e., mode status, fan status, equipment status) and optional four personal messages that can be added through the home automation programming or HyperTerminal session. Temporary (flashing) messages are programmed the same as personal messages but are designed to be quick messages that get reset shortly after they are displayed.

MESSAGE DISPLAY

SCROLL/ SET-UP BUTTONS

ADJUST

Mode

DIF2 BIAS

NETWORK OVERRIDE

REMOTE

DIF1

HEATEM. -AUX

ROOM

F C

O R

Fan

DEHUMHUMIDIFY

FAN

COOL

Enter

MAIN DISPLAY

BUTTONS

FIGURE 2

MAIN DISPLAY (Cont.)

• REMOTE TEMPERATURE/RELATIVE HUMIDITY – A temperature and/or a relative humidity value will be displayed alternately here when an optional remote temperature and/or humidity sensor has been installed (typical use is for outdoor temperature).

• NETWORK OVERRIDE – When NETWORK OVERRIDE is displayed, the thermostat has been taken off-line from the automation system. The thermostat can then only be operated at the thermostat.

• NETWORK STATUS – This computer icon shows the thermostat is connected to the system. The icon will flash when the thermostat sends or receives information. If there is no activity on the system for 15 minutes the computer icon will be steadily displayed with a cross-out circle. This does not mean the thermostat is unable to communicate, only that there has been no communication to this thermostat in the past 15 minutes.

SCROLL/SET-UP BUTTONS – The Scroll/Set-Up buttons function with the set-up features of the thermostat (refer to page 7).

MODE BUTTON – Five modes of operation are available on the Model 8870 thermostat: OFF, COOL, HEAT or COOL, EM. HEAT (for heat pumps only), and HEAT. The mode of operation indicates how you want your heating and cooling equipment to operate.

ADJUST BUTTON – The Adjust buttons adjust the heating and cooling temperature settings.

FAN BUTTON – The fan can be operated continuously (FAN ON) or only when there is a need to heat or cool.

ENTER (NETWORK OVERRIDE) BUTTON – The Enter button is used to override the home automation system, to clear temporary flashing messages on the message display, and edit the set-up features of the thermostat.

MAIN DISPLAY – The MAIN DISPLAY (

see Figure 2

) provides the mode status, temperature

and system status information.

• MODE STATUS – Shows the current mode of operation: OFF, COOL, HEAT or COOL, EM. HEAT (for heat pumps only), and HEAT. The current mode will flash to show when the equipment is running.

• SET POINTS – Shows the Heating and/or Cooling temperature settings.

• FAN STATUS – FAN ON indicates the fan is set to operate continuously.

• LOCKOUT – The lockout setting shows the thermostat buttons have been locked out and the thermostat settings can not be changed at the thermostat.

• ROOM TEMPERATURE – Shows the current room temperature. The temperature can be displayed in °F or °C. This would show relative humidity (%) if the thermostat has been installed with an optional humidity control senor.

NETWORK OVERRIDE

NETWORK STATUS

ROOM TEMPERATURE/ RELATIVE HUMIDITY

LOCKOUT

FAN STATUS

SET POINTS

REMOTE TEMPERATURE/

RELATIVE HUMIDITY

MODE STATUS

1. SELECT THE MODE (cont.)

• HEAT OR COOL (AUTO-CHANGEOVER) – HEAT or COOL appears on the display. Either the heating or cooling equipment will operate to maintain the room temperature at or above the HEAT setting and at or below the COOL setting. HEAT or COOL will flash when the respective equipment is operating.

• EMERGENCY HEAT (EM. HEAT for heat pump equipment only) – EM. HEAT appears on the display and only the back-up heat source will be operated to maintain the room temperature above the HEAT setting. This is generally more expensive than using the heat pump (HEAT MODE), so use accordingly. Typical usage is when the heat pump has malfunctioned.

• HEAT – HEAT appears on the display and only the heating equipment will be operated to maintain the temperature at the HEAT setting. HEAT will flash on the main display when the heating equipment is operating.

FIGURE 3

OPERATING THE THERMOSTAT

Notes on temperature adjustments:

• The COOL setting must always be a minimum of 2° (F or C) higher than the HEAT setting. The thermostat will automatically maintain the 2° difference. For example, if the Cooling set point is 75°F and one changes the Heating set point to 74°F, the thermostat will automatically change the Cooling set point to 76°F.

• The lockout icon will appear on the display when attempting to make a change, if the thermostat has been configured to be locked out or the desired change violates the thermostat limits (i.e. lowest allowable HEAT setting is 40°F, highest allowable COOL setting is 90°F, etc.). Lockout configuration can be altered in set-up menu (

see page 10

1. SELECT THE MODE

The thermostat can be set to OFF, COOL, HEAT or COOL (AUTO-CHANGEOVER), EM. HEAT (for heat pumps only), and HEAT modes. To set, press the MODE button until the desired mode appears on the display (see

Figure 3

• OFF – Select the OFF mode to prevent the heating and cooling equipment from operating.

• COOL – COOL appears on the display and only the cooling equipment will be operated to maintain the temperature at the COOL setting. COOL will flash on the main display when the cooling equipment is operating.

CAUTION: Do not set to OFF mode during periods when

freezing temperatures could occur.

OFF

COOL

HEAT OR COOL

HEAT

COOL

EM. HEAT

HEAT

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