Wiring - Honeywell 7800 Series Installation Instructions Manual

4. Mount the subbase securely using four No. 6 screws.
NOTE: You might receive an error code 101 (via KDM) if
one of the following conditions exist:
a. The screws securing the relay to the subbase are
not tight enough, re-tighten to insure there is no
gap between the relay and the subbase.
b. If you attempt to place a 2000 series relay on a
non-compatible 1000 series subbase, this indi-
cates that you must:
• Change out the subbase to a Q7800A2003/U
or Q7800A2005/U
• Choose a compatible 1000 series relay
modulebase to a Q7800A2003/U or
Q7800A2005/U
4
2
SPECIAL FUNCTION 1
LIMITS COMPLETE
2
2
2
L1 (HOT)
CONFIGURATION
JUMPERS
RESET
PUSHBUTTON
STATUS LEDs
SAFETY RELAY
CIRCUIT
OPTIONAL
KEYBOARD
DDL DISPLAY MODULE
RS485
1
2
DDL
REMOTE
COMMUNICATIONS 3
RESET
LOW FIRE
18
SWITCH
8K1
8K2
SPECIAL
17
FUNCTION 2
9K2
SPECIAL
19
FUNCTION 3
1 PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
SPECIAL
2 120 VAC INPUT FROM SYSTEM MASTER CONTROLLER REFER TO
20
FUNCTION 4
TABLE 1 AND FIGURE 8.
Fig. 10. RM7888A internal block diagram.

WIRING

1.
a. For the internal block diagram of the RM7888A,
see Fig. 10.
b. For proper subbase wiring, refer to Fig. 11.
c. For proper remote wiring of the Keyboard Display
Module; refer to the Specifications for the Key-
board Display Module (65-0090), or Extension
Cable Assembly (65-0131).
2. Disconnect the power supply from the main discon-
nect before beginning installation to prevent electri-
cal shock and equipment damage. More than one
disconnect may be involved.
3. All wiring must comply with all appropriate electrical
codes, ordinances and regulations. Wiring, where
required, must comply with NEC Class 1 wiring.
L2
1
120 Vac
FLAME SIGNAL
PLUG-IN
FLAME
MICROCOMPUTER
AMPLIFIER
TEST
2K
3K
4K
RELAY
DRIVE
5K
CIRCUIT
7K
1K
POWER SUPPLY
3K1
6K1
5
1K1
5K1 2K2
4K1
6
2K2
7
7K1
HIGH FIRE
12
COMMON
13
MODULATE
15
9K1
LOW FIRE
14
13
RM7888A 7800 SERIES RELAY MODULE
L2
TEST
JACK
F
G
22
RELAY
STATUS
FEEDBACK
AND LINE
VOLTAGE
INPUTS
CONTROL
POWER
ALARM
3
5 AIRVALVE
IGNITION
10
8
PILOT
9 MAIN VALVE
FLAME
21
PROVEN
INDICATES FEEDBACK SENSING
OF RELAY CONTACT
AND LINE VOLT INPUTS
FIELD WIRING
INTERNAL WIRING
M9496D
32-00214—01