Honeywell W8525A, W8525B User Manual

W8525A,B Control Module

M4901

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APPLICATION

The W8525A,B Control Module is used with the T7525A/T7526A Touchpad Thermostats. The Control Module contains the HVAC control relays, a microcontroller, and associated circuitry. It communicates with the Utility Gateway and Load Relay Module via power line carrier (PLC). It also powers and communicates with the T7525A/T7526A Touchpad Thermostats via a dedicated four-wire connection over the thermostat wires. It acts as a messaging gateway between the T7525A/T7526A Touchpad Thermostats and the Utility Gateway.

IMPORTANT

The specifications given in this publication do not include normal manufacturing tolerances. Therefore, an individual unit may not exactly match the listed specifications. Also, this product is tested and calibrated under closely controlled conditions and some minor differences in performance can be expected when those conditions are changed.

for Echelon

INSTALLATION INSTRUCTIONS

Models:

❑ W8525A1009: Control Module (conventional HVAC

systems).

❑ W8525B1007: Control Module (heat pump systems).

Electrical Ratings:

Input Voltage: 120 Vac.

Environmental:

Operating Ambient Temperature: –4 to 150°F (–20 to 66°C). Operating Relative Humidity: 5 to 90% rh, noncondensing. Storage Temperature: –20 to 175°F (–29 to 80°C).

Terminals:

Terminal strip for connection to T7525A Touchpad Thermostat.

Line Voltage Connections:

Three pigtail leads for line voltage wiring.

Mounting:

On 4 x 4 in. electrical box.

Dimensions:

See Fig. 1.

Weight:

2 lb (0.907 kg).

Fig. 1. W8525A,B Control Module approximate

dimensions in in. (mm).

INSTALLATION

When Installing this Product…

1. Read these instructions carefully. Failure to follow them could damage the product or cause a hazardous condition.

2. Check the ratings and description given on the product to make sure the product is suitable for your application.

3. Installer must comply with all local building codes and ordinances when installing this product.

4. Installer must be a trained, experienced service technician.

CAUTION

Disconnect power before installation to prevent electrical shock or equipment damage.

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W8525A,B CONTROL MODULE

Location

Mount the W8525A,B Control Module on a 4 x 4 in. electrical box near the air handling equipment or other location where it can be connected to the R, W, Y, and G wires for conventional HVAC systems or R, W1/Y, G, and W2 wires for heat pump HVAC systems with a common W1/Y wire.

Mounting (Fig. 2)

A Remove the W8525A,B Control Module from its

package. Set aside any mounting materials (screws, plastic screw anchors, etc.) until later in the mounting procedure.

B Make sure that the location chosen is clear of studs and

other possible obstructions behind the drywall.

W8525A

C Place the electrical box on the wall at the selected

location and use it as a stencil to outline the portion of the drywall to be cut away.

D Cut the opening for the electrical box. E Mount the electrical box in the cutout. F Run the line voltage wiring into the electrical box,

leaving a minimum of 3 in. (76 mm) of wire exposed in the electrical box for connection to the Control Module.

G Connect the line voltage wires to the Control Module

pigtail leads using wire nuts.

H Mount the Control Module on the electrical box using

the screws supplied.

I Connect the four wires from the Touchpad Thermostat

and the wires from the HVAC equipment to be controlled to the two terminal strips as shown in Figs. 3 and 4.

Y G W

6-32 (4)

TOUCHPAD

c R

Fig. 2. W8525A,B Control Module mounting on 4 x 4 in. electrical box.

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