Honeywell R7120M 7800 Serie Instructions D'installation page 3

NOTE: A 13 Vdc power supply must be used any time more
than one KDM is used.
9. Maximum wire lengths:
a. Flame Detector leadwires: The maximum flame
sensor leadwire length is limited by the flame signal
strength.
b. Remote Reset leadwires: The maximum length of
wire is 1000 feet (305 meters) to a Remote Reset
push button.
Application
Line voltage terminals.
Keyboard Display Module
Data ControlBus™ Module
Remote Reset Module
Communications Interface
a
ControlBus™ Module
13 Vdc full-wave rectified
transformer power input.
a
The KDM, Data ControlBus™ Module (for remote mounting or communications) must be wired in 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 mod-
ules on the closest and farthest end of the daisy chain configuration string require a 120 ohm (1/4 watt minimum) resistor ter-
mination across terminals 1 and 2 of the electrical connectors for connections over 100 feet (31 meters).
1
PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
2
R7120M1001-INTERMITTENT PILOT.
3
R7210M1019-INTERRUPTED PILOT.
INDICATES FEEDBACK SENSING
TO RELAY STATUS FEEDBACK
AND LINE VOLT INPUTS
FIELD WIRING
INTERNAL WIRING
OPTIONAL KEYBOARD
DISPLAY MODULE
DDL
DDL
COMMUNICATIONS
Fig. 1. Internal block diagram of R7120M (see Fig. 2 and 3 for detailed wiring instructions).
Table 1. Recommended Wire Sizes and Part Numbers.
Recommended Wire Size
14, 16 or 18 AWG copper conductor, 600 volt insulation,
moisture-resistant wire.
22 AWG two-wire twisted pair with ground, or five-wire. Belden 8723 shielded cable or equivalent.
22 AWG two-wire twisted pair with ground, or five-wire. Belden 8723 shielded cable or equivalent.
a
22 AWG two-wire twisted pair, insulated for low voltage. —
22 AWG two-wire twisted pair with ground.
18 AWG wire insulated for voltages and temperatures
for given application.
1
RUN/TEST
SWITCH
RESET
PUSHBUTTON
STATUS LEDs
LIMITS
RS485
1
2
REMOTE
3
RESET
10. Be sure loads do not exceed the terminal ratings. Refer
to the label on the R7120M or to the terminal ratings in
Table 3
120 VAC,
50/60 HZ
L1
(HOT)
1
CONFIGURATION
JUMPERS
MICROCOMPUTER
2K
3K
RELAY
4K
DRIVE
CIRCUIT
5K
6K
7K
SAFETY RELAY
1K
CIRCUIT
POWER SUPPLY
7
CONTROLLER LOCKOUT
INTERLOCK
(INCLUDING
AIRFLOW SWITCH)
6K1
3K1
3
R7120M 7800 SERIES RELAY MODULES
Recommended Part Numbers
TTW60C, THW75C, THHN90C.
Belden 8723 shielded cable or equivalent.
TTW60C, THW75C, THHN90C.
L2
PLUG-IN PURGE
TIMER CARD
TEST
FLAME SIGNAL
JACK
PLUG-IN
TEST
FLAME
AMPLIFIER
RELAY
STATUS
FEEDBACK
AND LINE
VOLTAGE
INPUTS
CONTROL
POWER
1K1 2K1 5K1
6 4
IGNITION
4K1
3
PILOT
2K2
5 MAIN VALVE
8
BLOWER
A
ALARM
2
S2
S1
2 3
M31277B
66-1193EF—01