Honeywell RM7890A, RM7890B, RM7890C, EC7890A, EC7890B User Manual

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Honeywell RM7890A, RM7890B, RM7890C, EC7890A, EC7890B User Manual

RM7890A,B,C/EC7890A,B

7800 SERIES Relay Modules

INSTALLATION INSTRUCTIONS

APPLICATION

The Honeywell RM7890A,B,C/EC7890A,B Relay Modules are microprocessor based integrated burner controls for semi-automatically fired gas, oil, or combination fuel single burner applications. The RM/EC7890 Relay Module is intended to replace the RA890F,G, H Protectorelay® Primary Control. The RM/EC7890 System consists of a relay module, subbase, and amplifier. Options include Personal Computer Interface, keyboard display module (KDM), Data ControlBus Module™, remote display mounting, first-out expanded annunciator and Combustion System Manager¨ Software.

Functions the RM/EC7890 provides include automatic burner sequencing, flame supervision, system status indication, system or self-diagnostics and troubleshooting.

This document provides installation and static checkout instructions. Other applicable publications are:

63-2278: Q7700 Network Interface Unit.

65-0084: Q7800A,B 22-Terminal Wiring Subbase Product Data.

65-0090: S7800A Keyboard Display Module Product Data.

65-0091: S7810A Data ControlBus Module™ Product Data.

65-0095: S7820 Remote Reset Module Product Data.

65-0097: 221729C Dust Cover Packing Instructions.

65-0101: S7830 Expanded Annunciator Product Data.

65-0109: R7824, R7847, R7848, R7849, R7851, R7861,

R7886 Flame Amplifiers for the 7800 SERIES Product Data.

65-0131: 221818A Extension Cable Assembly Product Data.

65-0229: 7800 SERIES Relay Modules Checkout and Troubleshooting.

SPECIFICATIONS

Electrical Ratings (See Table 3):

Voltage and Frequency:

RM7890: 120 Vac (+10/-15%), 50/60 Hz (±10%). EC7890: 220/ 240 Vac (+10%/-15%), 50/60 Hz (±10%).

Power Dissipation: 10W maximum. Maximum Total Connected Load: 2000 VA.

Fusing Total Connected Load: 15A maximum, type SC or equivalent, fast blow.

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.

Approvals:

RM7890A,B:

Underwriters Laboratories Inc. Listed: File No. MP268,

Guide No. MCCZ.

Canadian Standards Association Certified: LR9S329-3.

Factory Mutual Approved: Report No. J.I.1V9A0.AF.

Industrial Risk Insurers: Acceptable.

Federal Communications Commission: Part 15, Class B,

Emissions.

RM7890C:

Underwriters Laboratories Inc.: Component Recognized.

EC7890:

Factory Mutual: Approved.

EC7890A1029, EC7890B1028:

Gastec—EN268, Report 115679/1.

 

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® U.S. Registered Trademark

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Copyright © 2002 Honeywell • All Rights Reserved

*EC7890A1029

661089- 4

 

or EC7890B1028 only.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

RM7890A,B,C/EC7890A,B 7800 SERIES RELAY MODULES

INSTALLATION

WARNING

Fire or Explosion Hazard.

Can cause property damage, serious injury, or death.

To prevent possible hazardous burner operation, verify safety requirements each time a control is installed on a burner.

WARNING

Electrical Shock Hazard.

Can cause personal injury, death or equipment damage.

Disconnect the power supply before beginning 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 the application.

3.Installer must be a trained, experienced, flame safeguard service technician.

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

9.This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, can cause interference with radio communications. It has been tested and found to comply with the limits for a Class B computing device 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 can cause interference, in which case, the users, at their own expense, may be required to take whatever

measures are required to correct this interference. 10.This digital apparatus does not exceed the Class B limits for radio noise for digital apparatus set out in the Radio Interference Regulations of the Canadian

Department of Communications.

Location

Humidity

Install the relay module where the relative humidity never reaches the saturation point. The relay module is designed to operate in a maximum 85% relative humidity continuous, noncondensing, moisture environment. Condensing moisture can cause a safety shutdown.

Vibration

Do not install the relay module where it can be subjected to vibration in excess of 0.5G continuous maximum vibration.

IMPORTANT

1.Wiring connections for the relay modules are unique; refer to Fig. 2 or the appropriate Specifications for individual subbase wiring.

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

3.Wiring must comply with NEC Class 1 (Line Voltage) wiring.

4.Loads connected to the RM/EC7890 must not exceed those listed on the RM/EC7890 label or the Specifications; see Tables 3, 4, and 5.

5.Limits and interlocks must be rated to simultaneously carry and break current to the ignition transformer, pilot valve, and main fuel valve(s).

6.All external timers must be listed or componentrecognized by authorities who have proper jurisdiction.

7.For on-off gas-fired systems, some authorities who have jurisdiction prohibit the wiring of any limit or operating contacts in series between the flame safeguard control and the main fuel valve(s).

8.Two flame detectors can be connected in parallel with the exception of Infrared Flame Detectors (C7015).

Weather

The relay module is not designed to be weather tight. When installed outdoors, protect the relay module in an approved weather-tight enclosure.

Mounting Wiring Subbase

See Fig. 1 for the internal block diagram of RM/EC7890 Relay Module.

1.Mount the subbase in any position except horizontally with the bifurcated contacts pointing down. The standard vertical position is recommended. Any other position decreases the maximum ambient temperature rating.

2.Select a location on a wall, burner or electrical panel. The Q7800 can be mounted directly in the control cabinet. Be sure to allow adequate clearance for servicing, installation, access or removal of the RM/EC7890, expanded annunciator, KDM, flame amplifier, flame amplifier signal voltage probes, run/test switch, electrical signal voltage probes and electrical field connections.

3.For surface mounting, use the back of the subbase as a template to mark the four screw locations. Drill the pilot holes.

4.Securely mount the subbase using four no. 6 screws (not provided).

66-1089—4

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RM7890A,B,C/EC7890A,B 7800 SERIES RELAY MODULES

Wiring

WARNING

Electrical Shock Hazard.

Can cause personal injury or equipment damage.

Disconnect the power supply before beginning installation.

1.For proper subbase wiring and sequence chart, refer to Fig. 2.

2.For proper remote wiring of the KDM, refer to the Specifications for the KDM (65-0090), Network Interface Unit (63-2278), Data ControlBus Module™ (65-0091) or Extension Cable Assembly (65-0131).

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

4.All wiring must comply with all applicable electrical codes, ordinances and regulations. Wiring, where required, must comply with NEC, Class 1 (Line Voltage) wiring.

5.Use recommended wire routing of leadwires:

a.Do not run high voltage ignition transformer wires in the same conduit with the flame detector, Data ControlBus Module™, or Remote Reset Module wiring.

b.Do not route flame detector, Data ControlBus Module™, or Remote Reset Module leadwires in conduit with line voltage circuits.

c.Enclose flame detector leadwires without armor cable in metal cable or conduit.

d.Follow directions in flame detector, Data ControlBus Module™, or Remote Reset Module Instructions.

6.For KDM (KDM), because the KDM is powered from a low voltage, energy limited source, it can be mounted outside of a control panel if it is protected from mechanical damage.

NOTE: Use 13 Vdc power supply any time more than one KDM is used. A maximum of two KDM, Data ControlBus Modules™ or S7810B Multi-Drop Switch Modules are allowed in any combination.

7.Use maximum wire lengths:

a.RM/EC7890 leadwires: The maximum leadwire length is 300 feet (91 meters) to terminal inputs (Control, Running/Lockout Interlock).

b.Flame Detector leadwires: The maximum flame sensor leadwire length is limited by the flame signal strength.

c.Remote Reset leadwires: The maximum length of wire is 1000 feet (305 meters) to a Remote Reset pushbutton.

d.Data ControlBus Module™: The maximum Data ControlBus Module™ cable length depends on the number of system modules connected, the noise conditions and the cable used. The maximum length of all Data ControlBus Module™ interconnecting wire is 4000 feet (1219 meters).

8.For recommended wire size and type, see Table 1.

9.The KDM, Data ControlBus Module™ (for remote mounting or communications) or Communication Interface ControlBus™ Module must be wired in a daisy chain configuration,

1(a)-1(a), 2(b)-2(b), 3(c)-3(c). The order of interconnection of all the devices listed above is not important. Be aware that modules on the closest and farthest end of the daisy chain configuration string require a 120 ohm (1/4 watt minimum) resistor termination across terminals 1 and 2 of the electrical connectors for connections over 100 feet (31 meters).

10.For recommended grounding practices, see Table 2.

11.Be sure loads do not exceed the terminal ratings. Refer to the label on the RM/EC7890 or to the terminal ratings in Table 3.

Table 1. Recommended Wire Sizes and Part Numbers.

 

 

 

 

Application

 

Recommended Wire Size

Recommended Part Numbers

 

 

 

Line voltage terminals

14, 16, or 18 AWG copper conductor, 600

TTW60C, THW75C, THHN90C.

 

volt insulation wire.

 

 

 

 

 

Keyboard Display Module

22

AWG two-wire twisted pair with ground,

Belden 8723 shielded cable or

 

or five-wire.

equivalent.

 

 

 

 

Data ControlBus Module™

22

AWG two-wire twisted pair with ground,

Belden 8723 shielded cable or

 

or five-wire.

equivalent.

 

 

 

Remote Reset Module

22 AWG two-wire twisted pair, insulated for

 

low voltage.

 

 

 

 

 

Communications Interface ControlBus™

22

AWG two-wire twisted pair with ground.

Belden 8723 shielded cable or

Module

 

 

equivalent.

 

 

 

 

13 Vdc full-wave rectified transformer

18

AWG wire insulated for voltages and

TTW60C, THW75C, THHN90C.

power input.

temperatures for given application.

 

 

 

 

 

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66-1089—4

RM7890A,B,C/EC7890A,B 7800 SERIES RELAY MODULES

Table 2. Recommended Grounding Practices.

 

 

 

 

 

 

 

Ground Type

 

 

 

Recommended Practice

 

 

 

 

 

 

 

Earth ground (subbase and relay

 

1.

Use to provide a connection between the subbase and the control panel of the

module).

 

 

 

equipment. Earth ground must be capable of conducting enough current to blow

 

 

 

2.

the 15A fuse (or breaker) in the event of an internal short circuit.

 

 

 

Use wide straps or brackets to provide minimum length, maximum surface area

 

 

 

3.

ground conductors. If a leadwire is required, use 14 AWG copper wire.

 

 

 

Make sure that mechanically tightened joints along the ground path are free of

 

 

 

 

nonconductive coatings and protected against corrosion on mating surfaces.

 

 

 

 

 

 

Signal ground (Keyboard Display

 

Use the shield of the signal wire to ground the device to the signal ground terminals—

Module, Data ControlBus Module™,

 

3(c)—of each device. Connect the shield at both ends of the daisy chain to earth

Communications Interface

 

ground.

 

ControlBus™ Module).

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Table 3. Terminal Ratings.

 

 

 

 

 

 

Terminal Number

Description

 

Ratings (RM7890A,B,C)

Ratings (EC7890A,B)

 

 

 

 

 

G

Flame Sensor Ground

 

 

 

 

 

 

 

Earth G

Earth Grounda

 

 

L2(N)

Line Voltage Common

 

 

 

 

 

 

3

Line Voltage Supply (L1)

 

120 Vac (+10%/-15%), 50 or

220-240 Vac (=10%/-15%), 50 or 60 Hz

 

 

 

 

 

60 Hz (±10%).b

(±10%).

4

Alarm

 

 

120 Vac, 1A pilot duty.

220-240 VAc, 1A pilot duty.

 

 

 

 

 

 

5

Unused

 

 

 

 

 

 

6

Burner Controller and Limits

120 Vac, 8A run, 43A inrush.

220-240 Vac, 5A (maximum).

 

 

 

 

 

 

7

Unused

 

 

 

 

 

 

 

 

8

Pilot Valve/Ignition.

 

 

120 Vac.c

220-240 Vac, 4A at P.F. = 0.5, 20A inrush.

9

Main Fuel Valve.

 

 

120 Vac.c

220-240 Vac, 4A at P.F. = 0.5, 20A inrush.

10

Ignition

 

 

120 Vac, 4.5A ignition.c

220-240 Vac, 4A at P.F. = 0.2.

F(11)

Flame Sensor

 

 

60 to 220 Vac, current limited.

60 to 220 Vac, current limited.

 

 

 

 

 

 

12 to 21

Unused.

 

 

 

 

 

 

 

 

22

Shutter

 

 

120 Vac, 0.5A (RM7890B).

220-240 Vac (EC7890B only).d

aThe RM7890 must have an earth ground providing a connection between the subbase and the control panel or the equipment. The earth ground wire must be capable of conducting the current to blow the 20A fuse (or breaker) in event of an internal short circuit. The RM7890 needs a low impedance ground connection to the equipment frame which, in turn, needs a low impedance connection to earth ground. For a ground path to be low impedance at RF frequencies, the connection must be made with minimum length conductors having maximum surface areas. Wide straps or brackets rather than leadwires are preferred. Be careful to verify that mechanically tightened joints along the ground path, such as pipe or conduit threads or surfaces held together with fasteners, are free of nonconductive coatings and are protected against mating surface corrosion.

b 2000 VA maximum connected load to the RM7890 Assembly. c See Tables 4 and 5 for device load combinations.

d Requires 220-240 to 120 Vac, 10 Va minimum stepdown transformer to drive the shutter.

66-1089—4

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