Aprilaire 8365, 8366, 8344, 8346, 8348 User Manual

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MODEL 8344 HEAT/COOL NON-PROGRAMMABLE

MODEL 8346 HEAT PUMP NON-PROGRAMMABLE

MODEL 8348 HEAT/COOL MULTI-STAGE NON-PROGRAMMABLE

MODEL 8363 HEAT/COOL 5/2 DAY PROGRAMMABLE

MODEL 8365 HEAT PUMP 5/2 DAY PROGRAMMABLE

MODEL 8366 HEAT/COOL MULTI-STAGE 5/2 DAY PROGRAMMABLE

Installation Manual

Electronic

Thermostats

SPECIFICATIONS

Comfort Range 60°F – 80°F Comfort Control Accuracy ± 1°F (applies to settings within Comfort Range) Operating Range

32°F – 99°F Maximum Control Accuracy ± 2°F Temperature Setting (Control) Range 50°F – 90°F heating; 60°F – 90°F cooling Switched Load Voltage 18 – 30 volts Maximum Operating Current 1.0 Amp Maximum Surge Current 3.0 Amps Low Limit Temperature

41°F ± 9°F High Limit Temperature

100°F ± 9°F

Operating Range is the temperature range in which the thermostat will accurately display temperature.

Low Limit Temperature is the temperature setting of an internal, temperature-controlled mechanical switch in a circuit between RH and W for Models 8344, 8348, 8363 and 8366, and between R and W2 for Models 8346 and 8365. This device is intended to prevent freezing of water pipes should battery replacement be neglected.

High Limit Temperature is the setting of an internal, temperature-controlled mechanical switch in the circuit between the RH and the W terminal (W and W2 terminals for Model 8348 and 8366). This device will limit the room temperature should the contacts of the heat relay remain closed. Applies to Models 8344, 8348, 8363 and 8366 only.

WARNINGS

120 volts may cause serious injury from electrical shock. Disconnect electrical power to the furnace & air conditioner before starting installation. This thermostat is not a 120 volt (line voltage) device.

Improper installation may cause serious injury from electrical shock. This product must be installed by a qualified heating & air conditioning contractor in accordance with NEC Standards and applicable local and state codes.

Mercury is toxic and may be hazardous to your health. Any replaced thermostats containing mercury must be disposed of properly. Contact local authorities for disposal information.

THERMOSTAT INSTALLATION INSTRUCTIONS

Step1. Choose a location to mount the thermostat

• Approximately 5 feet off the floor (refer to local codes for compliance with

the Americans with Disabilities Act).

• On an interior wall where the temperature is most representative of the

zone being controlled by the thermostat.

• At least 18 inches away from an outside wall.

DO NOT MOUNT THERMOSTAT…

• Behind doors, in corners or other dead air spaces.

• In direct sunlight, near lamps

or other sources of heat.

• On an outside wall or any wall

exposed to an unconditioned space (i.e. garage).

• In the airflow path of a supply

• On a wall where concealed

pipes or ductwork will affect the thermostat temperature accuracy.

Step 2. Disassemble

the thermostat

• Flip open the cover.

• Remove the face of the

thermostat – no tools required.

Disassemble the Thermostat

Pull Here to Open

Step 3. Mount the thermostat on the wall

There are two sets of mounting holes – one set for use when mounting to a junction box, another set for direct wall mounting.

IMPORTANT! TURN OFF POWER AT THE HVAC EQUIPMENT BEFORE PROCEEDING WITH THERMOSTAT INSTALLATION!

Mounting the thermostat directly to the wall (without junction box)

1. Place the thermostat wire opening over the wall opening. If replacing a

thermostat, place the thermostat to cover the old thermostat silhouette. The base of the thermostat is raised to allow for wire routing behind the thermostat.

2. Level the thermostat (for appearance only) and mark the mounting hole

locations.

3. Drill a 3/16” dia. hole at the marked locations and install drywall anchors

(included). Drywall anchors should be used unless installing on paneling or other hard surfaces. Anchors should be flush with the wall surface.

4. Secure the thermostat to the wall using two (2), #8 x 1-1/2” long pan head

screws (included).

Mounting the Thermostat Directly to the Wall (without Junction Box)

Mounting the thermostat to a junction box

1. Install the top j-box screw (not included), until the head is approximately

1/8” from the surface of the wall.

2. Slide the thermostat on to the top screw.

3. Install the bottom screw (not included) to finish the installation.

Step 4. Set the ELEC/GAS switch to the proper position

(Models 8344, 8348, 8363 and 8366 only)

Setting the switch to ELEC will cause the G terminal to energize with the W terminal on a call for heat. Only the W terminal will energize on a heat call in the GAS position.

Mounting the Thermostat to a Junction Box

Set ELEC/GAS switch

ELEC

GAS

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