Aprilaire 8336 User Manual

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.

2 Heat / 2 Cool Digital

Heat Pump

MODEL 8336

User’s Manual

Installation and Operation

ELECTRONIC THERMOSTATS

Features

• Multi Stage heating and cooling control.

• Zone system compatible as a master thermostat.

• Multi-Colored LED indicators for system status.

• Low battery indicator.

• Fahrenheit/Celsius display option.

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

• Accuracy within ± 1 degree.

• Adjustable temperature differential: 1-3 degrees F.

• 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

R, V-VR or VR-R R 24 VAC, Return

Y, Y1 or M Y Stage 1 Cooling/Heating

Circuit

O or R O Reversing Valve,

(Cooling Mode)

B B Reversing Valve

(Heating Mode)

F or G G Fan control relay

Y2 Y2 2nd Stage Cooling

Circuit

W1 or W2 or W-U W2 2nd Stage Heating

Control

L or X L System Monitor LED

E E Emergency Heating

Circuit

C, X or B C 24 VAC, Transformer

Common Side

*NOTE: This thermostat requires a 24V common wire for proper operation.

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.

Installing the Model 8336 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-EM In OFF position.

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

4. Remove the cover using a coin or screwdriver.

COOL-OFF-HEAT-EM FAN: AUTO - ON

AUX

CHECK EMER

COOL-OFF-HEAT-EM

FAN: AUTO - ON

Figure 1

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.

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.

10. Secure base to wall with supplied screws.

Mounting Holes

Batteries NOT Required.

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

12. Put the °F/°C switch to either °F for Fahrenheit display or °C for Celsius display readout.

figure 4

13. Replace cover onto thermostat by snapping into place.

14. Turn on power to system. Test thermostat as described in the following section.

°F/°C Switch

Batteries NOT Required.

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