Honeywell R7849 User Manual

65-0109—8

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and flame detector can cause equipment damage.
In infrared applications (C7015 Infrared Flame 

Detector and R7848 Amplifier) using the RM7890 

Relay Module with software version 4004 or less 
requires a ten-second delay to start sequence. This 

applies only to the initial power of the RM7890.

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 on the 

product to make sure the product is suitable for your 

application.

3. Installer must be a trained, experienced, flame 

safeguard control technician.

4. After installation is complete, check out the product 

operation as provided in these instructions.

Disconnect the power supply before beginning 

installation. More than one power supply 
disconnection can be involved.

Can cause equipment damage.
Disconnect 7800 SERIES Relay Module power before 

removing amplifier.

death.
Disconnect the power supply before beginning 

installation. More than one power supply 

disconnection can be involved.

1. Align the amplifier circuit board edge connector with the 

keyed receptacle on the 7800 SERIES Relay Module. 
Be sure the amplifier nameplate faces away from the 

Relay Module. 

2. Push in the amplifier until the circuit board is fully 

inserted into the receptacle and then push the amplifier 

toward the 7800 SERIES Relay Module retaining clasp. 

3. Be sure the amplifier is firmly in place.
4. Perform all required checkout tests. 

NOTE: NOTE:Table 2 lists flame detection systems available 

for use with 7800 SERIES Relay Modules. Be sure to 

use the correct combination of amplifier and flame 

detector.

Proper flame detector installation is the basis of a safe and 

reliable flame safeguard installation. Refer to the Instructions 
packed with the flame detector and the equipment manufac-

turer instructions. 

Keep the flame signal leadwires as short as possible from the 

flame detector to the wiring subbase. Capacitance increases 

with leadwire length, reducing the signal strength. The 
maximum permissible leadwire length depends on the type of 

flame detector, leadwire and conduit. However, the ultimate 

limiting factor for the flame detector leadwire is the flame 
signal; see Table 3 in the Checkout section.

Disconnect power supply before beginning installation. 

More than one disconnection can be involved. 

1. Remove the 7800 SERIES Relay Module from the 

wiring subbase. 

2. Refer to Fig. 3 for proper flame detector wiring.