Aprilaire 8476 Outdoor temperature sensor optional, Thermostat mounting, Power & Reset options

Models: 8476

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Outdoor temperature sensor (optional)

Installation

Installation

Outdoor temperature sensor (optional)

Outdoor temperature can be measured by attaching an 8052 sensor to the S1 and S2 terminals.. System setting #05 (Remote sensor) is used to enable sensor..

Heat pump applications can use the outdoor temperature to effectively utilize the heat pump:

When the outdoor temperature is less than the Low Balance Point, the heat pump will be locked out and only auxiliary heating will be used.

When the outdoor temperature is higher than the High Balance Point, the auxiliary heating will be locked out and only the heat pump will be used to provide heating.

Install on side of building out of direct sunlight

(north side recommended)..

Mount above snow line.

Mount at least 3’ away from exhaust vents and condensing lines..

Maximum wire length is 300’.

Do not route wires along 120 VAC lines.

Thermostat mounting

 

Power & Reset options

 

 

 

The thermostat is dual power. It can either be AC or battery powered, or both (to provide backup power for the clock). Batteries are optional if the thermostat was connected to AC power when installed.

24 VAC must be connected in order for the system fault and emergency heat indicators to operate..

The thermostat has a memory backup that saves the thermostat’s settings in case of a power interruption.

The reset button located under the battery cover can be used to reset the thermostat back to factory defaults.. The system settings will also be reset back to defaults..

RC R

W

Y

G

C

S1 S2 O/B L

W2 Y2

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1.Remove the back of the thermostat, by pressing the tab on the bottom of the unit..

2..Pull wires through the opening on the back of the thermostat..

3.Position and level the back of the thermostat on wall and mark the hole locations with a pencil..

4.Drill 1/4” holes & insert supplied anchors (drywall only).

5.Place back over anchors, insert and tighten screws.

6.Seal wire entry holes to prevent drafts affecting temperature readings..

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Aprilaire 8476 Outdoor temperature sensor optional, Thermostat mounting, Power & Reset options, Installation