Aprilaire 8355 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.

7 Day Programmable 2 Heat / 2 Cool Heat Pump

MODEL 8355

User’s Manual

Installation and Programming

ELECTRONIC THERMOSTATS

Features

• Four pre-programmed setpoints for each day of the week.

• Fast and easy programming for setting all days of the week simultaneously.

• Energy efficient recovery.

• Residual cooling for added air-conditioning efficiency.

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

• Low battery indicator.

• Multi-colored LED indicators for system status.

• Zone compatible as master thermostat.

• Fahrenheit/Celsius display option.

• Programmable from 45°F (7°C) to 90°F (32°C).

• Accuracy within ±1 degree.

• Adjustable temperature differential: 1-3 degrees.

• Maintains summer and winter programming.

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

Y, Y1 or M Y1 Stage 1 Cooling/Heating Circuit

O or R O Reversing Valve (Cooling Mode)

B B Reversing Valve (Heating Mode)

G or F G Fan Contactor Circuit

Y2 Y2 2nd Stage Cooling Circuit

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

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 AC 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.

FIGURE 1

Installing the Model 8355 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.

IMPORTANT: This thermostat is compatible with 100% lockout systems. To reset the system, turn thermostat to OFF position for at least 60 seconds.

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.

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-EM

AUX CHECK EMER

FAN: AUTO - ON

FAN: AUTO-ON

COOL-OFF-HEAT-EM

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 holes.

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. Install two "AA" ENERGIZER brand batteries or equivalent into battery compartment. Be sure to match positive (+) ends of batteries with positive (+) battery terminals in the battery compartment.

13. Replace cover onto thermostat by snapping into place.

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

PROGPROG

MANMAN

Y1Y1

E G

FAN AUTO ONFAN AUTO ON

COOL OFF HEAT EMCOOL OFF HEAT EM

CHANGECHANGE

SETSET PROG/MANPROG/MAN

AMAM PMPM

MORN DAY EVE NITE EER

O B

C L RC L R

MOUNTING HOLES

PROGPROG

MANMAN

Y1Y1

E G

FAN AUTO ONFAN AUTO ON

COOL OFF HEAT EMCOOL OFF HEAT EM

CHANGECHANGE

SETSET PROG/MANPROG/MAN

AMAM PMPM

MORN DAY EVE NITE EERMORN DAY EVE NITE EER

O B

C L RC L R

OPENING

Programming Guide

Set Time of Day, Day of Week, Temperature Differential, Residual Cooling

1. Press SET & PROG/MAN. Release simultaneously.

Press or to change Time of Day.

2. Press 3. Press

To Change Day of Week

4. Press 5. Press

To change 1st Stage

Temperature Differential

NOTE: The Temperature Differential is Factory preset at 1°. This means that whenever the room temperature changes by one full degree from the temperature setting, the system will turn on. If the system turns on too often, increase the temperature differential.

6. Press 7. Press

To change 2nd Stage

Temperature Differential

NOTE: The Second Stage Temperature Differential is Factory preset at 2°.

8. Press 9. Press

To change

Residual Cooling

NOTE: The residual cool feature will keep the system fan on for an additional 30, 60 or 90 seconds after the compressor cycles off in cool mode. The residual cool feature can only be set in the cool mode.

PROG

MAN

SET PROG/MAN COOL-OFF-HEAT-EM

AUX CHECK EMER

FAN: AUTO - ON

SET PROG/MAN

SET P

1=MO 2=TU 3=WE 4=TH 5=FR 6=SA 7=SU

SET P

SET

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