Honeywell 7800 User Manual

7800 SERIES
S7810B Multi-Drop Switch Module

APPLICATION

The Honeywell 7800 SERIES is a microprocessor-based
integrated burner control for automatically fired gas, oil or
combination fuel single-burner applications. The 7800
SERIES is programmed to provide a level of safety, functional
capability and features beyond the capacity of conventional
controls. Functions provided by the 7800 SERIES include
automatic burner sequencing, flame supervision, system
status indication, system or self-diagnostics and
troubleshooting.

The S7810B Multi-Drop Switch Module supports remote
mounting of a Keyboard Display Module, personal computer
communications interface for multi-dropped 7800 SERIES
subnetworks, and remote reset of a 7800 SERIES
Relay Module.

PRODUCT DATA

FEATURES

• Multi-dropped communications bus interface.

• Remote reset.

• Ability to remotely mount a Keyboard Display Module.

Contents

Application ........................................................................ 1

Features ........................................................................... 1

Specifications ................................................................... 2

Ordering Information ......................................................... 2

Installation ........................................................................ 2

Building a Multi-Drop Network .......................................... 3

Operation .......................................................................... 4

65-0228—3

7800 SERIES S7810B MULTI-DROP SWITCH MODULE

SPECIFICATIONS

Model: S7810B Multi-Drop Switch Module.

Electrical Ratings:

Voltage and Frequency:

13 Vdc peak full-wave rectified (+20/-15%).

Power Dissipation:

2W maximum.

Terminal Ratings:

Power: 13 Vdc peak full-wave rectified.
Earth ground.
Local ControlBus (1,2,3) and Multi-Drop ControlBus

(6,7,8): 5 Vdc at 1 mA maximum.

Electrical Connector (included): ControlBus: 208727 8-pin

electrical connector.

Environmental Ratings:

Ambient Temperature:

Operating: -40°F to +140°F (-40°C to +60°C).
Storage: -40°F to +150°F (-40°C to 66°C).

Humidity:

85% relative humidity continuous, noncondensing.

Vibration:

0.5G environment.

Dimensions: See Fig. 1.

1-1/8 (29)

7/16 (11)

MODE

2-3/4
(69)

5/32
(4)

29/32 (23)

M11349B

BURNER CONTROL

4-27/32 (123)

Fig. 1. Mounting dimensions of S7810B

Multi-Drop Switch Module in in. (mm).

Weight: 4 ounces.

Replacement Part: 208727 eight-pin electrical connector.

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 given in the instructions and marked
on the product to make sure the product is suitable for
your application.

3. The installer must be a trained, experienced flame
safeguard technician.

4. Disconnect the power supply before beginning
installation to prevent electrical shock and equipment
damage. More than one power supply disconnect can
be required.

5. Wiring must comply with all applicable codes,
ordinances and regulations.

6. After installation is complete, check out product
operation as provided in these instructions.

IMPORTANT:

This equipment can cause interference with radio
communications.

This equipment generates, uses, and can radiate
radio frequency energy, and if not installed and used
in accordance with the Instructions Manual, may
cause interference with radio communication. It has
been tested and found to comply with the limits for a
Class A computing device pursuant to Subpart J of
Part 15 of FCC Rules, which are designed to provide
reasonable protection against such interference
when operated in a commercial environment.
Operation of this equipment in a residential area is
likely to cause interference, in which case, users at
their own expense will be required to take whatever
measures may be required to correct the
interference. Any unauthorized modification of this
equipment may result in the revocation of the
owner’s authority to continue its operation. When
operating the S7810B remotely with a separate
power supply, FCC compliance is not guaranteed
unless an FCC-approved power supply is used.

ORDERING INFORMATION

When purchasing replacement and modernization products from your TRADELINE® wholesaler or distributor, refer to the
TRADELINE® Catalog or price sheets for complete ordering number.

If you have additional questions, need further information, or would like to comment on our products or services, please write or
phone:

1. Your local Honeywell Automation and Control Products Sales Office (check white pages of your phone directory).

2. Honeywell Customer Care

1885 Douglas Drive North

Minneapolis, Minnesota 55422-4386
In Canada—Honeywell Limited/Honeywell Limitée, 35 Dynamic Drive, Scarborough, Ontario M1V 4Z9.
International Sales and Service Offices in all principal cities of the world. Manufacturing in Australia, Canada, Finland, France,
Germany, Japan, Mexico, Netherlands, Spain, Taiwan, United Kingdom, U.S.A.

65-0228—3 2

7800 SERIES S7810B MULTI-DROP SWITCH MODULE

Canadian EMI: This digital apparatus does not exceed the
Class A limits for radio noise emission from digital apparatus
set out in the Radio Interference Regulations of the Canadian
Department of Communications.

Le présent appareil numérique n’émet pas de bruits
radioélectriques dépassant les limites applicables aux
appareils numériques de la Classe A prescrites dans le
Règlement sur le brouillage radioeléctrique édicté par le
ministère des Communications du Canada.

Humidity

Install the S7810B where the relative humidity never reaches
the saturation point. The S7810B is designed to operate in a
maximum humidity environment of 85 percent relative humidity
continuous, noncondensing moisture.

Weather

The S7810B is not designed to be weather-tight. When
installed outdoors, protect the S7810B with an approved
weather-tight enclosure.

Vibration

Do not install the S7810B where it could be subjected to
vibration in excess of 0.5G continuous maximum vibration.

Mounting the S7810B Multi-Drop Switch Module.

1. Align the two ears of the Multi-Drop Switch Module with
the two mating slots on the 7800 SERIES Relay Module.

2. Insert the two interlocking ears into the two mating slots
and, with a hinge action, push on the lower corners of
the Multi-Drop Switch Module to secure it to the 7800
SERIES Relay Module.

Wiring (Fig. 2)

1. Refer to Fig. 2 for proper wiring.

2. All wiring must comply with all applicable electrical

codes, ordinances and regulations.

3. Recommended wiring size and type:
a. For ControlBus™ communications, use 22 AWG,

3-wire shielded cable (Belden part number 8723 or
equivalent).

b. For 13 Vdc and remote reset switch operation, use

22 AWG wire insulated for voltages and
temperatures in the application. Suggested wire
types include TW (60°C), THW (75°C) and THHN
(90°C) Terminal identification numbers and letters
shown in Table 1.

Table 1. S7810B and QS7800B Terminal Identification.

S7810B

Signal

Local Bus Data + 1 None

Local Bus Data - 2 None

Common

• Local Bus Common

• +13 Vdc Common

• Remote Reset Common

+13 Vdc 4 None

Remote Reset 5 None

Multi-Drop Bus Common 6 c

Multi-Drop Bus Data + 7 a

Multi-Drop Bus Data - 8 b

4. Wire routing:
a. Do not route the ControlBusª cable in conduit with

line voltage circuits.

b. Do not route the ControlBusª cable close to the

ignition transformers.

c. Route the ControlBusª cable outside of conduit if

properly supported and protected from damage.

d. Route the ControlBusª cable so that all devices are

connected in a daisy chain configuration. See Fig. 3.

5. Maximum wire lengths:
a. RS-485 Communications bus, 4000 feet

(1219 meters).

b. Remote reset switch, 1000 feet (305 meters).

Terminal

3 None

QS7800B

Termin al

BUILDING A MULTI-DROP NETWORK

The subnetwork addressing in the Q7700 Network Interface
Unit (NIU) is not contiguous. It is divided into two blocks,
containing 198 and 24 addresses, respectively. A maximum
multi-drop configuration would include 222 subnetworks
(198 plus 24) on a single Q7700 NIU.

One QS7800B ControlBusª Module card supports up to 31
multi-drop subnetworks without using an RS-485 repeater. If
an RS-485 repeater is used, up to 61 multi-drop subnetworks
can be supported by one QS7800B card. The RS-485 repeater
must be installed between the 30th and 31st subnetworks.

Each subnetwork includes one 7800 SERIES controller with or
without an S7800 Keyboard Display Module and/or an S7830
Expanded Annunciator. An S7810B1007 Multi-Drop Switch
Module is required in each subnetwork. See Fig. 3 for wiring
information.

Subnetworks can be spread evenly (balanced) across the NIU
slots to improve speed of communications.

It is recommended that the multi-drop network be built starting
with slot number 1 of the NIU, subject to the above guidelines.

Record the serial number and physical location of each
S7810B Multi-Drop Switch. This data will be useful when
commissioning the ZM7850 Combustion System Manager
(CSM) software. Refer to CSM manual, form 65-0102, for CSM
commissioning.

3 65-0228—3