Honeywell 7800 SERIES EC7895A Product Data page 12

7800 SERIES EC7895A, RM7895A RELAY MODULE
b. For EC7895 or RM7895, each device has an
earth ground terminal that must be grounded to
the metal control panel with wire as short as
practical. Each ground wire must be capable of
carrying a fault current equal to the rating of the
protective fuse (20A). A number 14 copper
conductor is adequate but wide straps or
brackets are preferred rather than leadwires.
6. Recommended wire routing for flame detector
leadwires:
1. Do not run high voltage ignition transformer wires
in the same conduit with the flame detection wiring.
2. Do not route scanner wires in a conduit with line
voltage circuits.
3. Enclose scanner wires without armor cable in
metal cable or conduit.
4. Follow directions given in the flame detector
Instructions.
WHITE
YELLOW
1 120V, 50/60 Hz POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
2 DO NOT CONNECT ANY WIRES TO UNUSED TERMINALS.
65-0205
G
L2
3
100V ALARM
BURNER MOTOR
4
(BLOWER)
5
BURNER
6
CONTROLLER/LIMITS
AIRFLOW
7
INTERLOCK
INTERMITTENT
8
PILOT/IGNITION
MAIN FUEL
9
VALVE(S)
IGNITION 10
F
RECTIFYING FLAME
ROD, RECTIFYING
PHOTOCELL, OR INFRA-
RED (LEAD SULFIDE)
FLAME DETECTOR
OR
C7027A, C7035A, OR
BLUE
C7044A ULTRAVIOLET
FLAME DETECTOR
OR
C7012A,C,E,F OR
BLUE
C7076A,D ULTRAVIOLET
FLAME DETECTOR
WHITE
WHITE
BLACK
BLACK
Fig. 7. Wiring the RM7895A.
7. Maximum wire lengths:
a. For the EC7895 or RM7895, the maximum length
of leadwire to the terminal inputs is 300 feet
(Control and Airflow Interlock).
b. For the flame detector leadwires, the maximum
flame sensor leadwire length is limited by the
flame signal strength.
8. Make sure loads do not exceed the terminal ratings.
Refer to the label on the EC7895 or RM7895 or to the
ratings in the Specifications, see Table 1A or 1B.
9. Check the power supply circuit. The voltage and
frequency tolerance must match those of the EC7895
or RM7895. A separate power supply circuit may be
required for the EC7895 or RM7895 with the required
disconnect means and overload protection added.
10. Check all wiring circuits and complete the Static
Checkout, see Table 4, before installing the EC7895 or
RM7895 on the subbase.
11. Install all electrical connectors.
12. Restore power to the panel.
Q7800
12
13
14
15
(L1)
16
17
2
18
19
20
21
22
L1
(HOT)
MASTER
SWITCH
FOR DIRECT SPARK IGNITION
(OIL OR GAS)
IGNITION
10
TRANSFORMER
9
8
L2
L1
L2
12
1
L2
L2
MAIN VALVE
M5111A