Final Wiring Check; Static Checkout - Honeywell 7800 SERIES Instruction Manual

EC7830A, RM7830A, EC7850A, RM7850A 7800 SERIES RELAY MODULES
Application
Line Voltage Terminals
a
KDM
Data ControlBus™ Module
Remote Reset Module
Communications Interface
ControlBus™ Module
13 Vdc full wave rectified
transformer power input
a
The KDM, Data ControlBus™ Module (for remote mounting or communications) or Communication Interface ControlBus™
Module must be wired in a 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 modules on the closest and farthest end of the daisy chain configuration
string require a 120 ohm (1/4 watt minimum) resistor termination across terminals 1 and 2 of the electrical connectors for
connections over 100 feet (30.5 meters).
Ground Type
Earth ground (subbase and relay
module)
Signal Ground (KDM, Data
ControlBus™ Module,
Communications Interface
ControlBus™ Module)

Final Wiring Check

1. Check the power supply circuit. The voltage and fre-
quency tolerance must match those of the relay module.
(A separate power supply circuit can be required for the
relay module.) Add the required disconnect means and
overload protection.
2. Check all wiring circuits and complete the Static
Checkout in Table 5 or 6 before installing the relay
module on the subbase.
3. Install the relay module.
4. Restore power to the panel.
Mounting EC/RM7830A; EC/
RM7850A Relay Module
1. Mount the relay module vertically on the Q7800
Subbase, or mount horizontally with the knife blade
terminals pointing down. When mounted on the
Q7800A, the relay module must be in an electrical
enclosure.
2. When mounting in an electrical enclosure, provide
adequate clearance for servicing, installation and
removal of the relay module, KDM, flame amplifier,
flame amplifier signal voltage probes, electrical signal
voltage probes and electrical connections.
66-1092—06
Fig. 4. Wiring subbase and sequence chart for EC/RM7850A.
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, insulated for low voltage. —
22 AWG two-wire twisted pair with ground.
18 AWG wire insulated for voltages and temperatures
for given application.
Table 2. Recommended Grounding Practices.
1. Use to provide a connection between the subbase and the control panel of the
equipment. Earth ground must be capable of conducting enough current to blow
the 15A fuse (or breaker) in the event of an internal short circuit.
2. Use wide straps or brackets to provide minimum-length, maximum-surface area
ground conductors. If a leadwire must be used, use 14 AWG copper wire.
3. Make sure that mechanically tightened joints along the ground path are free of
nonconductive coatings and protected against corrosion on mating surfaces.
Use the shield of the signal wire to ground the device to the signal ground terminal 3(c)
of each device. Connect the shield at both ends of the daisy chain to earth ground.
TTW60C, THW75C, THHN90C.
Belden 8723 shielded cable or equivalent.
TTW60C, THW75C, THHN90C.
Recommended Practice
a. Allow an additional 2 in. (51 mm) below the relay
module for the flame amplifier mounting.
b. Allow an optional 3 in. (76 mm) minimum on both
sides of the relay module for electrical signal voltage
probes.
3. Make sure no subbase wiring is projecting beyond the
terminal blocks. Tuck in wiring against the back of the
subbase so it does not interfere with the knife blade
terminals or bifurcated contacts.
IMPORTANT
Install the relay module with a plug-in motion rather
than a hinge action.
4. Mount the relay module by aligning the four L shaped
corner guides and knife blade terminals with the
bifurcated contacts on the wiring subbase and securely
tightening the two screws without deforming the plastic.

STATIC CHECKOUT

After checking all wiring, perform this checkout before
installing the relay module on the wiring subbase. These tests
verify that the Q7800 Wiring Subbase is wired correctly and
8
Recommended Part Numbers