Aprilaire 8531 111-137B 97185 Installation Instructions, Specifications, Thermostat Installation

INSTALLATION INSTRUCTIONS

LOCATION

To ensure proper operation, the thermostat should be mounted on an inside wall in a frequently occupied area of the building. In addition, its position must be at least 18" (46cm) from any outside wall, and approx- imately 5' (1.5m) above the floor in a location with freely circulating air of an average temperature.

BE SURE TO AVOID THE FOLLOWING LOCATIONS:

-behind doors or in corners where freely circulating air is unavailable

-where direct sunlight or radiant heat from appli- ances might affect control operation

-on an outside wall

-adjacent to, or in line with, conditioned air dis- charge grilles, stairwells, or outside doors

-where its operation may be affected by steam or water pipes or warm air stacks in an adjacent parti- tion space, or by an unheated/uncooled area behind the thermostat

-where its operation will be affected by the supply air of an adjacent unit

-near sources of electrical interference such as arc- ing relay contacts

	SPECIFICATIONS
Rated Voltage	20-30 VAC, 24 nominal
Rated	0.08 Amps to 1.5 Amps continuous
Current	per output with surges to 4 Amps Max.
Control	Heating: 38° to 88°F in 1° Steps
Range	5° to 30°C in 1° Steps
Thermostat
Measurement	28° to 124°F or 0° to 48°C

THERMOSTAT INSTALLATION

1.Insert a flat blade screwdriver or coin 1/8" into the slot located in the bottom center of the thermostat case and twist 1/4 turn. When you feel or hear a click, grasp the case from the bottom two corners and sep- arate from the subbase as shown in the diagram at the right. Some models require more force than oth- ers when separating due to the number of terminals on the subbase.

2.Swing the thermostat out from the bottom.

3.Lift the thermostat up and off the subbase.

4.Place the rectangular opening in the subbase over the equipment control wires protruding from the wall and, using the subbase as a template, mark the location of the two mounting holes (exact vertical mounting is necessary only for appearance).

5.Use the supplied anchors and screws for mounting on drywall or plaster; drill two 3/16" (5mm) diameter holes at the marked locations; use a hammer to tap the nylon anchors in flush to the wall surface and fas- ten subbase using the supplied screws. (Do not over- tighten!)

6.Connect the wires from your system to the thermo- stat terminals as shown in the wiring diagrams. Carefully dress the wires so that any excess is pushed back into the wall cavity or junction box. Ensure that the wires are flush to the plastic subbase. The access hole should be sealed or stuffed to pre- vent drafts from affecting the thermostat.

REPLACING THE THERMOSTAT

ON THE SUBBASE

1.Position the thermostat on the hinged tabs located at the top of the subbase.

2.Gently swing the thermostat down and press on the bottom center edge until it snaps in place.

		OFF	ON
	4 MINUTE			2 MINUTE
(MIN ON/OFF)				(MIN ON\OFF)
KEYBOARD UNLOCKED				KEYBOARD LOCKED

OUTPUT TERMINAL FUNCTIONS

RH . . . . . . .24 VAC supply from heating equipment

W. . . . . . .Heat energized with a heating call

Range
Control	±.5° C at 20°C
Accuracy	±1°F at 68°F

NOTE: This thermostat contains electronic circuitry replacing the conventional mechanical anticipator.

8531

RH

W

	Line
W1	Voltage

24VAC

Transformer

P.O. BOX 1467 • MADISON, WI 53701-1467

CALL 608/257-8801 • FAX 608/257-4357 Products For Better Indoor Air Quality.