Product Overview

R7824, R7847, R7848, R7849, R7851, R7861, R7886 AMPLIFIERS FOR 7800 SERIES RELAY MODULES
66-2034—3 2
• R7824C and R7847C Dynamic Self-Check Rectification
Amplifier, R7861 Self-Check Ultraviolet Flame
Amplifier and R7886A Dynamic Self-Check Ultraviolet
Amplifier test the detectors and all electronic
components in the flame detection system 12 times
per minute. The 7800 SERIES Relay Module locks out
on safety shutdown with flame detection system
failure.
NOTE: R7824C, Series 2 or greater, and R7847C, series 4
or greater, pulse shutter when signal of 1.5 Vac is
sensed.
SPECIFICATIONS
Models:
Flame Detection Systems (see Table 2):
Rectification:
R7824C for use with C7024E,F Solid State Ultraviolet
Detectors.
R7847A for use with flame rods, rectifying photocells or
C7012A,C Solid State Ultraviolet Detectors.
R7847B for use with flame rods, rectifying photocells or
C7012A,C Solid State Ultraviolet Detectors.
R7847C for use with C7012E,F Solid State Ultraviolet
Detectors.
Infrared:
R7848A for use with C7015 Infrared (lead sulfide)
Detector.
R7848B for use with C7015 Infrared (lead sulfide)
Detector.
Ultraviolet:
R7849A for use with C7027/C7035/C7044 Minipeeper
Ultraviolet Detectors.
R7849B for use with C7027/C7035/C7044 Minipeeper
Ultraviolet Detectors.
R7861A for use with C7061A Ultraviolet Detector.
R7886A for use with C7076A,D Ultraviolet Detectors with
adjustable sensitivity.
Optical:
R7851B for use with C7927, C7935, C7915 and C7962
Flame Detectors.
Flame Failure Response Time :
See Table 1.
Table 1. Relay Module Flame Failure
Response Time (FFRT).
Flame Signal (Volts dc):
Minimum Acceptable: 1.25 Vdc.
Flame Signal Voltage Range (displayed on Keyboard Display
Module or measured with a 1M ohm voltmeter plugged into
amplifier test jacks): 0.0 to 5.0 Vdc.
Environmental Ratings:
Ambient Temperature:
Operating: -40°F to 140°F (-40°C to 60°C).
Storage: -40°F to 150°F (-40°C to 65°C).
Humidity: Operating 85% rh continuous, noncondensing.
Vibration: Continuous 0.5G environment.
Dimensions:
See Fig. 1.
Fig. 1. Flame amplifier dimensions in in. (mm).
Weight:
2.5 oz (71 g), unpacked.
Approvals:
Underwriters Laboratories Inc. Listed: File no. MP268, guide
no. MCCZZ: R7847A, R7847B, R7847C, R7861A,
R7886A, R7848A, R7848B, R7849A, R7849B, R7851B.
Underwriters Laboratories Inc. Component Recognized: File
no. MP268, guide no. MCCZZ: R7824C.
Canadian Standards Association Certified: LR95329-3.
Factory Mutual Approved: Report J.I.1V9A0.AF.
Industrial Risk Insurers Acceptable.
NOTE: EN298 Approved: When these amplifiers are
used with an EC7810, EC7820, EC/RM7830, or
EC/RM7850 Relay Module.
Accessories:
Flame Simulators:
Rectification: Part no. 123514A.
Ultraviolet: Part no. 203659.
Flame Detectors ordered separately:
CAUTION
Equipment Damage Hazard.
Can cause equipment damage and failure.
Incorrect combination of relay module, amplifier and
flame detector can cause equipment damage.
In infrared applications (C7015 Infrared Flame
Detector and R7848 Amplifier) using the RM7890
Relay Module with soft revision 4004 or less requires a
ten second delay to start sequence. This applies only
to the initial powering of the RM7890.
Relay Module
Flame Failure Response Time (FFRT)
0.8 or 1.0 second 2.0 or 3.0 seconds
EC7810, EC7820,
EC/RM7830,
EC/RM7850
1.0 2.0
EC/RM7823,
EC/RM7885,
EC/RM7890,
EC/RM7895,
EC/RM7896,
EC/RM7888,
EC/RM7838,
EC/RM7800,
EC/RM7840
0.8 3.0
RM7824 N/A 3.0
S
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