Honeywell W8735G Installation Instructions Manual

W8735G Communication Gateway

INSTALLATION INSTRUCTIONS

FEATURES

• Monitors the bus for critical events and updates the
server.

• Monitors system power and generates power failure
alarms.

• Battery backup.

• Monitor up to four separate appliances.

• Updates via phone line or network.

• Auxiliary I/O.

• Remote firmware updates.

When Installing This Product…

1. Read these instructions carefully. Failure to follow the

manual could damage the product.

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

3. Complete all wiring connections to the gateway before
powering up the 24Vac system transformer and plug-

APPLICATION

For use with Remote Access applications monitoring
EnviraCOM™ enabled controls and sensors. Communicates
with up to four EnviraCOM™ buses for multiple appliance
installations.

ging in the gateway power supply into an outlet.

4. All wiring must comply with applicable local electrical
codes, ordinances and regulations.

INSTALLATION

COMPONENTS AND ACCESSORIES

• R7184 Oil Primary

• R7284 Oil Primary

• L7224 Aquastat®

• L7248 Aquastat®

• TH9421C VisionPRO® IAQ

• W8735S1016 Indoor Temperature Module for temperature
indication and alerting.

Mount the W8735G in the equipment room near the indoor
HVAC equipment. Position the W8735G vertically so that the
power and telephone plugs are situated towards the bottom or
horizontally so that all wiring terminations face the floor,
depending on the space available. See Fig. 1.

IMPORTANT

Turn OFF all power to heating and cooling equip­ment.

1. Position the W8735G on a wall near the indoor HVAC
equipment. Level the module for appearances only; the
module functions properly even when not level.

2. Use a pencil to mark the mounting holes to be used.
The W8735G has two external mounting holes and two
external flanges. See Fig. 2.

3. Use a minimum of one hole and one flange to mount the
W8735G.

69-2432-01

W8735G COMMUNICATION GATEWAY

CAUTION

4. Remove the W8735G from the wall and drill a minimum

of two 3/16-in. holes in the wall (if drywall) as marked.
For firmer material such as plaster, drill a minimum of
two 7/32-in. holes.

5. When mounting to the wall, gently tap provided anchors
into the drilled holes until flush with the wall.

6. Position the W8735G over the drilled holes. Insert the
provided mounting screws in the holes and tighten.

W8735G

10

(254)

EnviraCOM™

Enabled

Status

FURNACE OR BOILER

WATER HEATER

M29960

Fig. 1. Locating the W8735G in the Equipment Room.

WIRING

Voltage Hazard.
Can cause electrical shock or equipment damage.

Disconnect power before beginning installation to
prevent electrical shock and equipment damage. More
than one disconnect may be involved.

IMPORTANT

All wiring must comply with local electrical codes and
ordinances or NEC codes.

IMPORTANT

Use 18 to 20 gauge color-coded cable for proper wir­ing. Shielded cable is typically not required. Keep
this wiring at least one foot away from large inductive
loads such as electronic air cleaners, motors, line
starters, lighting ballasts, and large distribution pan­els. Failure to follow these wiring practices may intro­duce electrical interference (noise) which can cause
erratic system operation. All unused wire is to be
grounded at controller end only. The bus wire to ter­minal 1/D must not exceed 1,000 feet (305 M).

5 (127)

2

(51)

12V DC

M29958

Fig. 2. W8735G Dimensions in inches (mm).

General Wiring Directions

Refer to Fig. 3 and Table 1 for the location and function of
each terminal.

IMPORTANT

Wire the W8735G with the plug-in 12V power supply
disconnected.

1. Remove power from all devices to be connected to the
W8735G (Channels and Auxiliary Input and Output).

2. Remove the cover from the W8735G by gently pulling
the cover plate outward to disengage the friction
latches, which are on the side opposite of the wiring
connections.

3. Identify the terminal block to be connected and loosen
the terminal screws using a 3.5 mm slotted screw driver
See Fig. 3 and Fig. 4.

4. Insert wire end through the rubber grommet, which is
supplied in the bag assembly.

5. Place each of the three cables into its proper terminal
and securely tighten each screw.

6. As needed, adjust the position of the grommet and
press it into place in the slot on the base. See Fig. 3.

7. Replace the cover.

69-2432—01 2

8. Bundle the wires and tie-off using the two wire tie-offs
molded into the base. See Fig. 3.

W8735G COMMUNICATION GATEWAY

SIDE VIEW SHOWING CHANNEL AND AUXILIARY PORTS

WIRE

TIE-OFF

CHANNEL 1

CHANNEL 2

AUXILIARY

OUTPUT

AUXILIARY

INPUT

CHANNEL 3

CHANNEL 4

WIRE

TIE-OFF

TELEPHONE

NETWORK

W8735G Terminal Designation Function

Channel 1

1/D (channel 1) To EnviraCOM channel 1 network; DATA

2/R (channel 1) To EnviraCOM channel 1 network; 24 Vac Hot

3/B (channel 1) To EnviraCOM channel 1 network; 24 Vac Common

Channel 2

1/D (channel 2) To EnviraCOM channel 2 network; DATA

2/R (channel 2) To EnviraCOM channel 2 network; 24 Vac Hot

3/B (channel 2) To EnviraCOM channel 2 network; 24 Vac Common

Auxiliary

Auxiliary Output (DO) Connect to N.O. contact; alarm input

Auxiliary Output (DO) Connect to N.O. contact; alarm input

Auxiliary Input (DI) Connect to N.C. sensor contact; 18–30 Vac/Vdc

Auxiliary Input (DI) Connect to N.C. sensor contact; 18–30 Vac/Vdc

Channel 3 (Model 1018 only)

1/D (channel 3) To EnviraCOM channel 3 network; DATA

2/R (channel 3) To EnviraCOM channel 3 network; 24 Vac Hot

3/B (channel 3) To EnviraCOM channel 3 network; 24 Vac Common

Channel 4 (Model 1018 only)

1/D (channel 4) To EnviraCOM channel 4 network; DATA

2/R (channel 4) To EnviraCOM channel 4 network; 24 Vac Hot

3/B (channel 4) To EnviraCOM channel 4 network; 24 Vac Common

See Fig. 5 for a typical W8735G application.

WIRE
TIE-OFF

POWER

RUBBER GROMMET (X5)

TERMINAL BLOCK

WIRE

Fig. 3. Wiring Connections (4-Channel).

Table 1. W8735G Terminal Designations.

SCREW
DRIVER

M29956

3 69-2432—01

W8735G COMMUNICATION GATEWAY

CHANNEL TERMINAL

1/D

2/R

3/B

M29957

Fig. 4. Communication Bus Terminals (4-channel).

VISIONPRO IAQ

2

TO OPTIONAL
ENVIRACOM
CONTROLS
AND SENSORS

R7184U OIL
PRIMARY CONTROL

THERMOSTAT OPTIONAL.

1

2

REVIEW COMPONENTS AND ACCESSORIES SECTION FOR
COMPATIBLE DEVICES.

1 2 3

1

2
3

1

TELEPHONE

NETWORK

W8735G
COMMUNICATION
GATEWAY

1/D
2/R
3/B

EnviraCOM™

Enabled

Status

POWER

M29961

Fig. 5. W8735G with EnviraCOM oil primary and

VisionPRO IAQ.

W8735G GATEWAY LED CODES

The multipurpose LED is used to indicate battery life, gateway
functionality, and abnormal (alarm) conditions. In case of
multiple events, only the event with the highest priority will be
displayed.

Battery good LOWEST Normal Operation. Green (Solid)

Battery low Replace the battery. Green/Off

Battery dead No backup battery. Risk of data loss during power outage. Green/Red

Time not available Gateway has not connected to the server yet. Red/Amber/Green

Attempting to connect to
server

Connected to server Gateway is connected to server and data transfer is in

Server NACK No account set up for the gateway on server. Amber/Red

License expired One or more of the active channels have expired license. Red (Solid)

EnviraCOM
communication loss

Auxiliary alarm Power lost to the Auxiliary Input. Amber/Off

Critical alarm HIGHEST One or more of the active channels have active critical

Wiring the Auxiliary Input/Output Term inals

The Auxiliary contacts are available to integrate non­EnviraCOM sensors and switches to the W8735G and to
allow the W8735G to interface with non-EnviraCOM
monitoring devices in case an alert condition is detected. See
Fig. 6 for AUX-IN and AUX-OUT wiring connections.

Table 2. LED Diagnostic Blink Code.

Event Priority Description LED Color Flashes

Gateway is trying to contact the server, data transfer not

Amber/Green

started yet.

Amber (Solid)

progress.

One or more of the active channels have stopped working

Red/Off/Amber/Off

(no data received for five minutes).

Red/Off

alarm, or a critical global alarm is active.

AUXILIARY INPUT (AUX-IN)

Generic devices such as flood sensors, temperature
controllers (for attic or outdoor temperature sensing) and
basic 24 Vac/Vdc thermostats can be connected to the
Auxiliary Input contacts to integrate non-EnviraCOM devices
to the W8735G.

69-2432—01 4

W8735G COMMUNICATION GATEWAY

M29962

AUXILIARY TERMINALS

AUX-IN

AUX-OUT

The Auxiliary Input port is labeled DI on the side of the case.
Power for the Auxiliary Input (AUX-IN) may be drawn from an
active communication channel (terminals 2 and 3) or a
separate 24Vac transformer if no communications channel is
used. See Fig. 7 and 8.

Connect the AUX-IN terminal to an optional normally closed
(N.C.) sensor contact that fulfills the desired function. The
Auxiliary Input terminals accept a voltage input of 18-30 Vac/
dc. Power to the Auxiliary Input represents a normal, non­alarm condition, while a loss of power to the contacts
represents an alarm condition.

The Auxiliary Input accepts up to 30 Vac or Vdc presenting no
more than a 10 mA load.

AUXILIARY OUTPUT (AUX-OUT)

The Auxiliary Output closes in the event an alert condition is
detected from the W8735G or from the Auxiliary Input. The
Auxiliary Output (dry) contacts remain closed until the alert
condition is cleared. Use the Auxiliary Output terminals to
interface with a lamp or buzzer to locally indicate an alert
condition (see Fig. 13) or connect to a residential security
panel in order to integrate the HVAC alerts to the home
security system (see Fig. 12).

The Auxiliary Output is a normally open, dry contact that
supports a load current of up to 1 A. A closed output indicates
an alert condition. The auxiliary output port is labeled DO on
the side of the case.

NOTE: The Auxiliary Output is “made” on all alert conditions

and is deactivated when the alert is cleared from the
communication bus.

Auxiliary Input and Output Applications

AUXILIARY INPUT (AUX-IN) TERMINAL

• Connect the Auxiliary Input (AUX-IN) terminals to a
normally closed dry contact sensor, drawing power from an
active EnviraCOM channel or external transformer. See
Fig. 7.

• Connect the Auxiliary Input (AUX-IN) terminals to a
normally closed contact sensor, drawing 24 V power from
an external power supply. See Fig. 8.

• For multiple sensors, connect in series to enunciate any
condition on the AUX-IN loop. See Fig. 9.

• For multiple sensors, connect in parallel to annunciate an
“AND” condition on the AUX-IN loop. See Fig. 10.

• Connect a 24 Vac/dc sensor. See Fig. 11.

AUXILIARY OUTPUT (AUX-OUT) TERMINAL

• Connect the N.O. Auxiliary Output terminals to an optional
home alarm system or other local alert enunciation device.
See Fig. 12.

• Use a 24 Vac relay if the enunciating device operates at
line voltage. See Fig. 13.

1

1/D
2/R

CHANNEL 1

3/B

IMPORTANT

Make sure the current draw through the Auxiliary
Output terminals does not exceed specifications.
Use relays or contactors to integrate to line voltage
devices.

Fig. 6. AUX-IN and AUX-OUT Terminals (located on the

main circuit board).

1/D
2/R

AUXILIARY SENSOR

(DRY CONTACTS)

1

POWER FROM THE AUXILIARY INPUT MAY BE DRAWN FROM AN ACTIVE
COMMUNICATION CHANNEL AS SHOWN (2/R AND 3/B).

CHANNEL 2

3/B

OUTPUT

AUXILIA RY

INPUT

M23752

Fig. 7. Wiring Normally Closed Contact Sensor to the

AUX-IN Terminal Block (Channel Powered).

5 69-2432—01

W8735G COMMUNICATION GATEWAY

CHANNEL 1

CHANNEL 2

OUTPUT

INPUT

AUXILIA RY

POWER FROM THE AUXILIARY INPUT SUPPLIED BY TRANSFORMER.

1

T87 OR SIMILAR

1

M23753

1/D
2/R
3/B

1/D
2/R
3/B

COMBINATION OF DEVICES CONNECTED IN SERIES TO ANNUNCIATE
ON ANY EVENT ON THE AUX-IN LOOP.

1

CHANNEL 1

CHANNEL 2

OUTPUT

INPUT

AUXILIA RY

1

M23754

1/D
2/R
3/B

1/D
2/R
3/B

N.C. N.C.

1/D

CHANNEL 1

2/R
3/B

1/D
2/R

CHANNEL 2

3/B

1

N.C.

OUTPUT

N.C.

INPUT

1

COMBINATION OF DEVICES CONNECTED IN PARALLEL TO
ANNUNCIATE ON AN “AND” EVENT ON THE AUX-IN LOOP.

AUXILIA RY

M23755

Fig. 8. Wiring Normally Closed Contact Sensor to the

AUX-IN Terminal Block (External Power Supply).

Fig. 9. Wiring the AUX-IN Terminal Block with devices in

series (External Power Supply).

Fig. 10. Wiring the AUX-IN Terminal Block with devices in

parallel (External Power Supply).

1/D
2/R

CHANNEL 1

3/B

1/D

CHANNEL 2

2/R
3/B

OUTPUT

24 VAC/VDC

SENSOR

INPUT

AUXILIA RY

M23756

Fig. 11. Wiring the AUX-IN Terminal Block to a 24 Vac/dc

Sensor.

69-2432—01 6

Fig. 12. Wiring the AUX-OUT Terminal Block to a Home

HOME SECURITY

PANEL

AUXILIARY

CHANNEL 1

CHANNEL 2

OUTPUT

INPUT

AUXILIA RY

M23757

1/D
2/R
3/B

1/D
2/R
3/B

Security Panel.

NOTE: For the wiring in Fig. 12, be sure to check the exact

connections with the Home Security Panel Installa­tion Instructions-Auxiliary Devices.

W8735G COMMUNICATION GATEWAY

condition, it queues up the alarm report to the server. If the
alarm message is active on the bus for a period exceeding 5
minutes, the gateway connects to the server and delivers its
alarm report. If the gateway fails to connect while attempting
to deliver an alarm report, it will retry at five minute intervals
until successful.

The W8735G also reports a runtime data log for the bus or
busses it is monitoring. During a 24 hour period, a W8735G
communicating via a phone connection will dial out once
between midnight and 4:00

AM local time to deliver the

previous day's log. Broadband gateways update the server
every 30 minutes. Applications requiring closer monitoring
and faster updates should be connected to a network
connection.

Upon power-up, the gateway will conduct a self test which
includes a broadband or dial-up attempt using a pre­programmed 800 number. Dial-up connections are only used
in cases where Broadband connections are unavailable. For
best performance, connect to both Network and Telephone
connections. See Fig. 14.

W8735G
COMMUNICATION
GATEWAY

ENVIRACOM
BUS

1/D
2/R
3/B

EnviraCOM™

Enabled

1/D

CHANNEL 1

2/R
3/B

1/D
2/R

CHANNEL 2

3/B

L1

24 VAC

TRANSFORMER

L2

BUZZER

N.O. 24 VAC

RELAY

Fig. 13. Wiring the AUX-OUT Terminal Block to Line

Voltage Annunciating Device (Buzzer).

OUTPUT

AUXILIA RY

INPUT

M23758

Phone/Network Communication

The W8735G Communication Gateway can update the
Application server using either a dial-up or broadband
connection. See Fig. 14. When the W8735G detects an alarm

Status

TELEPHONE
JACK

TELEPHONE

NETWORK

POWER

ROUTER

CABLE/DSL MODEM

M29954

Fig. 14. Connecting the gateway to a network or phone

line.

IMPORTANT

— A phone line filter will be required if the gateway is

sharing the line with a DSL modem.

— The gateway will not attempt to dial out if the tele-

phone line is in use.

— Use only with analog telephone lines.

IMPORTANT

If the phone line is needed while the gateway is con­nected, simply picking up a phone off the hook will
cause the gateway to release the line. Other
instances/phone systems may require pressing the
Flash button on the telephone.

7 69-2432—01

W8735G COMMUNICATION GATEWAY

PREFIX 9

Some installations may require a 9 prefix be dialed in order to
gain a dial tone. The W8735G supports this feature by way of
the preset jumper. See Fig. 15. When this jumper is in place, a
“9” will be added to the programmed dial-out number.
Removing the jumper removes the 9 from the dial-out
sequence.

PREFIX 9
JUMPER

M29955

Fig. 15. Prefix 9 Jumper.

MULTIPLE DIAL-OUT ATTEMPTS:

The normal communication procedure is for the gateway to
first attempt a network connection. If this is unavailable, the
gateway will attempt to dial out via the modem. Multiple
numbers may be programmed into the gateway as backups
(check Web App features). Thirty minute periods are allotted
to each programmed dial-out number, with dial-out attempts
occurring at approximately five minute intervals. At the end of
a 30 minute period, the next access number in the queue is
attempted. This routine is repeated between midnight and
4:00

AM local time at which point dial-out attempts cease. The

routine is repeated during the next reporting time of midnight­4:00 AM.

Battery Replacement

IMPORTANT

The battery backup will ensure that if the power to the
gateway is out for a period exceeding one hour, the gateway
will attempt to access the server to announce the outage.

Battery health is monitored constantly. Once a battery is
replaced, the LED may take a few seconds to reflect the new
battery.

For best performance replace the 9V battery yearly
or as indicated by the LED (as described in Table 2).

Battery Installation

1. Press the latch on the top of the battery cover and pull it

away from the gateway. See Fig. 16.

2. Connect 9 Vdc battery to the connector leads.

3. Insert the battery in the battery compartment.

4. Insert the bottom tabs of the battery cover into the slots

on the case, then swing the battery cover until the latch
engages.

BATTERY
COVER LATCH

BATTERY COVER

9V BATTERY LEADS

BATTERY INSTALLED

IMPORTANT

For best gateway performance, connect to both the
network and phone.

Gateway Updates

Periodically, the gateway may require a firmware upgrade to
enable new features supported by the web application. This
will occur automatically on a schedule determined by the web
application administrators.

Automation and Control Solutions

Honeywell International Inc.

1985 Douglas Drive North

Golden Valley, MN 55422

Honeywell Limited-Honeywell Limitée

35 Dynamic Drive

Toronto, Ontario M1V 4Z9

customer.honeywell.com

® U.S. Registered Trademark
© 2010 Honeywell International Inc.
69-2432—01 M.S. 06-10
Printed in U.S.A.

M23760

Fig. 16. Battery Installation.