Honeywell 202151TXR User Manual

Figure

E527

e527 Datasheet

Overview

Like the larger e528, the compact, low profile e527 thermostat takes advantage of component end-of-life to redesign hardware and produce a more efficient, lower cost device. With onboard radio and RS485 connection and an added CDS light sensor, the e527 maintains its position as an integral part of the INNCOM Integrated Room Automation System (IRAS) and a property’s Energy Management System (EMS).

Features

In an EMS, the e527 controls room heating and cooling using occupancy data collected from motion detectors and door switches and can be networked to the property’s central management system. As an IRAS device, the e527 can communicate with devices within a room and function as a room gateway device towards the mesh network.

• British gang mounting (American gang mounting with optional frame)

• Accurate temperature measurement +/- 1 degree F

• External temperature sensor support

• Motion sensor for occupancy detection

• RF transceiver (onboard 802.15.4, 2.4GHz radio) for wireless guestroom and backhaul network

communications

• RS485 for wired backhaul network communications

• Photo sensor for light level detection

Installation Requirements

The e527 must be located on a partitioning interior wall, approximately 5' (1.5 m) above the floor, in a site of average temperature. It is important to ensure that the thermostat is located away from direct sunlight or radiant heat, air discharge grilles, stairwells, outside doors, steam or water pipes, warm air stacks, unheated/uncooled areas, or sources of electrical interference. The unit should not be placed on an outside wall or behind a door.

The e527 is designed to be mounted on a standard British-style single-gang electrical box. For use with an American box, the e527 can be installed in an optional frame by means of two screws. Screws for attaching the optional frame and mounting the e527 are included. The device is shipped with a clear clamshell dust cover.

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Headers

Figure 2 E527 Front/Back and External Headers

H1 ICP microprocessor programming H2 Humidity sensor H3 System interconnect H4 PIR sensor H5 ES1 H6 RS485 network header (see pinout below) H7 System 5 header (see pinout below) H8 System interconnect H9 External temperature control sensor (see pinout below)

H6 Pinout

Pin Function Comment

1 Common GND

2 12VDC

3 S5bus Communication bus

4 Dry Input Input

5 RS485B RS485 Twisted Pair

6 RS485A RS485 Twisted Pair

Min Nom Max

10V 12V

14V

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H7 Pinout

Pin Function Comment

1 Common GND

2 12VDC

3 S5bus Communication bus

Min Nom Max

10V 12V

14V

H9 Pinout

Pin Function Comment

1 Common GND

2 Common GND 3 External temp sensor

Motion Detection

The optional motion detector available on the e527 works in conjunction with the electronic door lock to determine room occupancy. If the door lock reports that the door has opened and closed and no motion is detected in the room for a set number of minutes, the e527 engages energy conservation setbacks. When motion is detected, the e527 returns to its occupied state. Also, the e527 reports occupancy changes to the central server.

Figure 3 Motion Sensor Sensitivity

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