Aprilaire 8353 User Manual

Installation Guide

IMPORTANT SAFETY INFORMATION WARNING:

•

Always turn off power at the main power source by unscrewing fuse or switching circuit breaker to the off position before installing, removing, cleaning, or servicing thermostat.

•

Read all of the information in this manual before installing or programming this thermostat.

•

This is a 24V AC low-voltage thermostat. Do not install on voltages higher than 30V AC.

•

All wiring must conform to local and national building and electrical codes and ordinances.

•

Do not short (jumper) across terminals on the gas valve or at the system control to test installation. This will damage the thermostat and void the warranty.

5 - 2 Day Programmable 1 Heat / 1 Cool Electric / Gas

MODEL 8353

User’s Manual

Installation and Programming

ELECTRONIC THERMOSTATS

Features

• Four setpoints for weekday programming—two setpoints for weekend comfort.

• Two “AA” ENERGIZER brand batteries retain program memory, even during power outages.

• Low battery indicator.

• Fahrenheit/Celsius display option.

• Programmable from 45°F (4°C) to 90°F (32°C).

• Accuracy within ± 1 degree.

• Adjustable temperature differential: 1-3 degrees.

• Maintains summer and winter programming.

• Low temperature freeze protection. While in heat mode, thermostat will mechanically turn on heat if temperature drops to 40°F (4°C) – even if batteries are missing or drained.

• Automatic heating shutdown if temperature exceeds 90°F (32°C).

Replacing Existing Thermostat

1. Turn off power to heating and cooling system.

2. Remove cover of old thermostat to expose wires. Do not disconnect wires. (Fig. 1)

3. Label wires per Table 1.

Table 1

Old Label New Label Description

M, 4, RH, R5 or R RH Heat Transformer,

hot side

V or RC RC Cooling Transformer, hot

side

Y or Y6 Y Cooling control

H, W or 4 W Heating control

F or G G Fan control relay

C* Y or None Either cooling control or

common side of transformer

*NOTE: On some older models, the C terminal can be either the coolingcontrol or the common side of the transformer. Check furnace wiring diagram to verify C terminal. If it is the common side of the transformer, cap the wire and tuck into the wall. If it is the cooling control, connect to the Y terminal.

4. After labeling wires, remove wires from terminals.

5. Remove existing thermostat base from wall.

6. Refer to the following section for instructions on how to install thermostat.

Figure 1

Installing the Model 8353 Thermostat

NOTE: For new installations, mount thermostat on inside wall, 4-5 feet

above the floor. Do not install behind a door, in a corner, near air vents, in direct sunlight, or near any heat or steam generating fixtures. Installation at these places will affect thermostat operation.

1. Turn power off to the heating and cooling systems.

2. Place COOL-OFF-HEAT In OFF position.

3. Place FAN: AUTO–ON switch Into AUTO position.

4. Remove the cover using a coin or screwdriver.

Figure 2

5. Place thermostat against the wall at desired location. Make sure wires will feed through opening on base of thermostat.

6. Mark placement of mounting holes. See Fig. 3. Set base aside.

PROG

MAN

SET PROG/MAN COOL-OFF-HEAT FAN: AUTO - ON

COOL-OFF-HEAT

FAN: AUTO-ON

Figure 3

7. Drill the marked holes using a 3/16” drill bit. Note: Enclosed plastic anchors do not require a drilled hole for drywall.

8. Tap plastic anchors into the wall.

9. Align base with plastic anchors and feed wires through opening. See Fig 4.

Figure 4

10. Secure base to wall with supplied screws.

11. Connect wires to terminal strip. Refer to wiring diagrams on other side of this sheet. Make sure wire connections are secure.

12. Place fan option switch into either the “ELEC” or “GAS” position depending upon the type of furnace. Refer to Figure 5.

Figure 5

PROG

MAN

CHANGE SET AUTO/MAN

Elec Gas

AM PM

MORN DAY EVE NITE

W Y

FAN AUTO ON

MOUNTING HOLES

COOL OFF HEAT

PROG

MAN

CHANGE SET AUTO/MAN

Elec Gas

AM PM

MORN DAY EVE NITE

W Y

FAN AUTO ONCOOL OFF HEAT

PROG

MAN

CHANGE SET AUTO/MAN

Elec Gas

AM PM

MORN DAY EVE NITE

W Y

FAN AUTO ON

FAN OPTION SWITCH

Controls fan delay.

COOL OFF HEAT

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