Honeywell EC7895A Thermostat User Manual

Home

800 SERIES EC7895A, RM7895A

Relay Module

PRODUCT DATA

•

Dependable, long-term operation provided by microcomputer

technology.

First-out annunciation and system diagnostics provided by a 2

row by 20 column Vacuum Fluorescent Display (VFD) located

on the optional Keyboard Display Module.

Five (LEDs) for sequence information.

Interchangeable plug-in flame amplifiers.

Local or remote annunciation of EC7895 and RM7895

operation and fault information.

•

Nonvolatile memory; EC7895 and RM7895 retain history files

and sequencing status after loss of power.

Remote reset (optional).

•

Report generation (optional).

Selectable recycle or lockout on loss of airflow.

Selectable recycle or lockout on loss of flame.

Shutter drive output.

Burner controller data (optional):

—

Flame signal strength.

Hold status.

Lockout/alarm status.

Sequence status.

Sequence time.

Total cycles of operation.

Total hours of operation.

Fault history providing for the six most recent faults:

GENERAL

•

Cycles of operation at the time of the fault.

Fault message and code.

Hours of operation at the time of the fault.

Sequence status at the time of the fault.

Sequence time at the time of the fault.

The Yamatake Honeywell EC7895A and RM7895 is a microprocessor

based integrated burner control for automatically fired gas, oil, or

combination fuel single burner applications. The RM7895 consists of

the Relay Module. Subbase, Amplifier and Purge Card. Options

include Keyboard Display Module, Personal Computer Interface,

DATA CONTROLBUS MODULE™, Remote Display Module, and

COMBUSTION SYSTEM MANAGER™ Software.

—

Diagnostic information:

•

Device type.

Flame amplifier type.

Flame failure response time.

Manufacturing code.

On/Off status of all digital inputs and outputs.

Selected prepurge time.

Software revision and version of EC7895 and RM7895

and optional Keyboard Display Module.

Status of configuration jumpers.

The EC7895 and RM7895 are programmed to provide a level of

safety, functional capability and features beyond the capacity of

conventional controls.

•

Functions provided by the EC7895 and RM7895 include automatic

burner sequencing, flame supervision, system status indication,

system or self-diagnostics and troubleshooting.

Contents

FEATURES

General .........................................................................................

Features ........................................................................................

Specifications ................................................................................

Ordering Information .....................................................................

Principal Technical Features .........................................................

Safety Provisions ..........................................................................

Installation .....................................................................................

Wiring ............................................................................................ 11

Assembly ...................................................................................... 14

Operation ...................................................................................... 17

Checkout ....................................................................................... 20

Troubleshooting ............................................................................ 26

•

Safety features:

—

Airflow switch check.

Closed loop logic test.

Dynamic AMPLI-CHECK®.

Dynamic input check.

Dynamic safety relay test.

Dynamic self-check logic.

Internal hardware status monitoring.

Tamper resistant timing and logic.

•

Access for external electrical voltage checks.

Application flexibility.

Communication interface capability.

•

X-XX UL

65-0205

7800 SERIES EC7895A, RM7895A RELAY MODULE

Electrical Ratings, see Table 1A:

SPECIFICATIONS

Voltage and Frequency: 100 Vac (+10/-15%), 50 or 60 Hz

(+/- 10%).

Model:

RM7895A

Power Dissipation: RM7895: 10W maximum.

Maximum Total Connected Load: 2000 VA.

Fusing Total Connected Load: 20A maximum, type FRN or

equivalent.

Table 1A. RM7895A Terminal Ratings.

Terminal No.

Description

Ratings

Flame Sensor Ground

Earth G

Earth Ground

L2(N)

Line Voltage Common

Alarm

100 Vac, 1A pilot duty.

Burner Motor

Line Voltage Supply (L1)

Burner Controller and Limits

Airflow Interlock

Pilot Valve/Ignition

Main Fuel Valve

Ignition

100 Vac, 9.8 AFL, 58.8 ALR (inrush).

100 Vac (+10/-15%), 50 or 60 Hz (+/- 10%).

100 Vac, 1 mA.

3,4

100 Vac, 9A.

100 Vac, 4.5A ignition and 50VA pilot duty.

100 Vac, 2A pilot duty.

100 Vac, 4.5A ignition.

F(11)

Flame Sensor

Unused

60 to 220 Vac, current limited.

Unused

Shutter

100 Vac, 0.5A

Range of allowable operating frequency: 45 to 66 Hz.

The 7895 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 7895 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 that have 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.

000 VA maximum connected load to 7895 Assembly.

Can also be 100 Vac, 1A pilot duty.

Can also be 65 VA pilot duty with motorized valve, 1150 VA inrush, 460 VA open, 250 VA hold.

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:

Your local Home and Building Control Sales Office (check white pages of your phone directory).

Home and Building Control Customer Relations

Honeywell, 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.

65-0205

7800 SERIES EC7895A, RM7895A RELAY MODULE

Model:

EC7895

Electrical Ratings, see Table 1B:

Voltage and Frequency: 200 Vac (+10/-15%), 50 or 60 Hz

(+/- 10%).

Power Dissipation: EC7895: 10W maximum.

Maximum Total Connected Load: 2000 VA.

Fusing Total Connected Load: 20A maximum, type FRN or

equivalent.

Table 1B. EC7895A Terminal Ratings.

Terminal No.

Description

Flame Sensor Ground

Earth Ground²

Line Voltage Common

Alarm

Ratings

Earth G

L2 (N)

200 Vac, 1A pilot duty.

Burner Motor

Line Voltage Supply (L1)

Burner Controller and Limits

Airflow Interlock

Pilot Valve/Ignition

Main Fuel Valve

Ignition

200 Vac, 4A at pF = 0.5, 20A inrush⁴

200 Vac (+10/-15%), 50 or 60 Hz (+/- 10%).³^,⁴

200 Vac, 1 mA.

200 Vac, 9A.

200 Vac, 4A at pF = 0.5, 20A inrush⁴

60 to 220 Vac, current limited.

F(11)

Flame Sensor

Unused

Shutter

200 Vac, 0.5A

Range of allowable operating frequency 45 through 66 Hz.

The EC7895 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 RM7895 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 that have 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.

000 VA maximum connected load to EC7895 Assembly.

Total load current excluding burner/boiler motor and firing rate outputs cannot exceed 5A, 25A inrush.

65-0205

7800 SERIES EC7895A, RM7895A RELAY MODULE

Environmental Ratings:

Weight:

Ambient Temperature:

RM7895 with Dust Cover: 1 pound 15 ounces, unpacked.

Operating: -40° F to 140° F.

Storage: -60° F to 150° F.

Humidity: 85% RH continuous, noncondensing.

Vibration: 0.5G environment.

IMPORTANT

Flame Detection System available for use with

EC7895 and RM7895. To select your Plug-in Flame

Signal Amplifier and applicable Flame Detector, see

Table 2 and Fig. 3 through 5.

Dimensions:

Refer to Fig. 1 and 2.

Table 2. Flame detection systems (Figs. 3, 4, 5).

Plug-in Flame Signal Amplifiers

Applicable Flame Detectors

Flame

Failure

Response

Time

Self-

Checking

Type

Color

Model

Fuel

Gas

Type

Models

Rectification

Green

R7847A

.8 or 3 sec

Rectifying Flame C7004, C7007, C7011

Rod Holders

Complete Assemblies:

C7008, C7009, Q179.

R7847A

R7847B^d

.8 or 3 sec

3 sec

Oil

Rectifying

Photocell

C7003, C7010, C7013,

C7014

C7012A,C.^c

Gas,

Ultraviolet

Oil, Coal (Purple Peeper)

Dynamic

AMPLI-

CHECK®

.8 or 3 sec

Gas

Rectifying Flame C7004, C7007, C7011

Rod Holders Complete Assemblies:

C7008, C7009, Q179.

Dynamic

AMPLI-

CHECK®

R7847B^d

.8 or 3 sec

3 sec

Oil

Rectifying

Photocell

C7003, C7010, C7013,

C7014

Dynamic

AMPLI-

Gas,

Ultraviolet

C7012A,C.^c

Oil, Coal (Purple Peeper)

CHECK®

Dynamic

Self-Check

R7847C^e

R7848A

R7848B^d

3 sec

Gas,

Oil, Coal (Purple Peeper)

Gas, Infrared

Oil, Coal (Lead Sulfide)

Gas, Infrared

Ultraviolet

C7012E,F.

C7015

Infrared

Red

Dynamic

AMPLI-

C7015

Oil, Coal (Lead Sulfide)

CHECK®

Ultraviolet

Purple

R7849A

.8 or 3 sec

Gas, Oil Ultraviolet

C7027, C7035,

C7044.

(MiniPeeper)

Dynamic

AMPLI-

R7849B^d

Gas, Oil Ultraviolet

(MiniPeeper)

C7027, C7035,

C7044.

CHECK®

Dynamic

Self-Check

R7861A

3 sec

Gas,

Oil, Coal

Ultraviolet

C7061

C7076

Blue

Dynamic

Self-Check

R7886A^e

Gas,

Oil, Coal (Adjustable

Sensitivity)

Order flame rod separately; see holder Instructions.

Use only Honeywell Photocell, part no. 38316.

The C7012A,C, C7027, C7035 and C7044 Flame Detectors should be used only on burners that cycle on-off at least once

every twenty-four hours. Appliances with burners that remain on continuously for twenty-four hours or longer should use the

C7012E,F Flame Detector with the R7847C Amplifier or the C7076A,D Flame Detector with the R7886A Amplifier or the C7061

Flame detector with the R7861 Amplifier as the ultraviolet flame detection system.

Circuitry tests the flame signal amplifier at least 12 times a minute during burner operation and shuts down the burner if the

amplifier fails.

Circuitry tests all electronic components in the flame detection system (amplifier and detector) 12 times a minute during burner

operation and shuts down the burner if the detection system fails.

When R7861 is used with EC7895, the application requires a step down transformer. See Fig. 14.

Use with RM7895A only.

65-0205

7800 SERIES EC7895A, RM7895A RELAY MODULE

Sequence Timing For Normal Operation:

Flame Establishing Period

Device

Initiate

Standby

Purge

Pilot

Main

EC7895A/RM7895A

10 sec.

4 or 10 sec.

STANDBY and RUN can be an infinite time period.

* PURGE is determined by the ST7800A Purge Card selected.

Approval Bodies:

Accessories:

RM7895A:

Optional:

Underwriters Laboratories Inc. listed: File no. MP268,

Guide no. MCCZ.

Network Interface Unit,

Part No. Q7700A1014, 120V 50/60 Hz

Factory Mutual approved.

EC7895A:

Factory Mutual approved.

Part No. Q7700B1004, 100V to 200V 50/60 Hz

Network Interface ControlBus Module,

Part No. QS7800A1001.

COMBUSTION SYSTEM MANAGER™,

Mounting:

Part No. ZM7850A1001.

Q7800A for panel mount or Q7800B for wall or burner mount.

ControlBus 5-Wire Electrical Connector,

Part No. 203541.

Required Components:

DATA CONTROLBUS MODULE™,

Part No. S7810A1009.

Dust Cover, Part No. 221729A.

Plug-in Flame Signal Amplifier, see Table 2.

Plug-in Purge Timer Cards: Selectable ST7800A, two

seconds to 30 minutes.

Flame Simulators:

Q7800A or Q7800B.

UV Flame Simulator, Part No. 203659.

Rectification Simulator, Part No. 123514A.

Keyboard Display Module, Part No. S7800A1001,

English.

Keyboard Display Module, Part No. S7800A1118,

Japanese.

Remote Display Mounting Bracket, Part No. 203765.

Remote Display Power Supply, Part No. 203968A Plug-in.

Remote Reset Module, Part No. 57820A1007.

Sixty-inch Extension Cable Assembly, Part No. 221818A.

BURNER

CONTROL

127)

(

POWER

PILOT

FLAME

MAIN

ALARM

RESET

-1/4 (133)

(127)

M11135

REMOVE ONLY FOR TERMINAL TEST ACCESS.

Fig. 1. Mounting dimensions of EC7895/RM7895 Relay Module and Q7800A Subbase in in. (mm).

65-0205

7800 SERIES EC7895A, RM7895A RELAY MODULE

BURNER

CONTROL

(

127)

POWER

PILOT

FLAME

MAIN

ALARM

RESET

6-3/32 (155)

(127)

REMOVE ONLY FOR TERMINAL TEST ACCESS.

M11134

Fig. 2. Mounting dimensions of EC7895/RM7895 Relay Module and Q7800B Subbase in in. (mm).

IGNITION

ELECTRODE

FLAME ROD

(Q179C ONLY)

CERAMIC

INSULATORS

(25)

-21/32

1-13/32

(36)

(42)

TARGET

/8 (10)

MOUNTING FLANGE

-7/32

183)

3/4–14 NPT

(

5-1/8 (130)

(

-1/8

79)

-1/16

3-3/4

95)

(27)

1/2 (13)

(

3-7/16

(87)

3/32 (2)

11/16

(

18)

(

5/32

20)

25/32

(20)

(

7/32

14)

THREADED

MOUNTING

HOLES (2)–

10-32 UNF

1/2–14 NPSM

5-1/4 (133)

-25/32

62)

LEADWIRES

(

FACEPLATE

M1962A

BRACKET

M1983

Q179

C7012A,C,E,F

13/16 (21)

1-1/4 (32)

1-3/8 (35)

(

51)

(

-3/4

45)

1-1/4 (32)

1-5/16 (33)

(

/16

C7013A

C7014A

M1847

Fig. 3. Rectification detectors.

65-0205

7800 SERIES EC7895A, RM7895A RELAY MODULE

4-1/8 (105)

COLLAR WITH

–11-1/2 NPSM

2 (51)

-3/16

(30)

1/2-14 NPSM

INTERNAL THREADS

INTERNAL

THREADS

(102)

6 FOOT (1.83 METER)

LEADWIRES (2)

3-1/2 (89)

1/32

(

-1/2 (25)

38)

1-1/16

(27)

[

FOOT

1.83 METER]

LEADWIRES (2)

2-5/8 (67)

INSERTION DEPTH

COLLAR WITH 1/2-14 NPSM

INTERNAL THREADS

DIN APPROVED C7035A1064 HAS 1-11 BSP.P1 INTERNAL THREADS.

DIN APPROVED C7035A1064 HAS 1/2-14 BSP-F INTERNAL THREADS.

MODEL AVAILABLE WITH 24 FOOT (7.32 METER) LEADWIRES.

MODELS AVAILABLE WITH SPUD CONNECTOR (1/2-14 NPSM INTERNAL

THREADS) INSTEAD OF CLAMP TYPE CONNECTOR.

M1943A

MODEL AVAILABLE WITH 12 FOOT [3.66 METER] LEADWIRES.

M1945A

C7027

C7035

FOOT [1.83 METER]

LEADWIRES (2)

MOUNTING BRACKET

3/8

(10)

7/8

(22)

9/16

(14)

1/2

(13)

1-27/64