5
NOTES:
1. Liquid tight ttings and some labeled signal leads are provided for all signal (low voltage)
connections for both pre-wired and conduit units.
2. Units should be ordered with the appropriate option to provide powered relays designed for the
incoming/outgoing power.
Pre-Wired
Pre-wired units are supplied with a 16 AWG cable(s) with 3-wire grounded USA 115 volt plug for incoming
power and 3-wire grounded receptacle cords for all control relay outputs also 16 AWG.
Conduit
Conduit units are predrilled at the factory and supplied with conduit knockouts for easy hard wiring to supplied
detachable connectors on the relay card(s) located in the lower section of the controller. Remove the screws
of the lower panel for access.
NOTES:
1. Do not drill holes in upper section of enclosure.
2. All relays provide a N.O. and N.C. output.
options selected. To change relay activation, see on page 24.
4. See page 35 for common bleed / blowdown valve wiring.
for a normally open dry contact relay output.)
WARNING:
Relay Card Wiring
Rev. I Relay Card Rev. N Relay Card
!
NET
GRD
N.O.
N.C.
NET
GRD
N.O.
N.C.
NET
GRD
N.O.
N.C.
NET
GRD
N.O.
N.C.
NET
GRD
N.O.
N.C.
FUSE
FUSE
FUSE
FUSE
FUSE
POWER INPUT
H N
G
Dry contact
115 volt relay
Ribbon Cable
2
1
10
9
Relay Card Rev. D
See note below
Jumpers above relay can change it
to a dry contact relay. Use GRD and
N.O. for a N.O. dry contact relay.
Powered relay Dry contact
*
Relays 6-20 only on
multi-system controllers
INPUT
FUSE
FUSE
FUSE
FUSE
FUSE
FUSE
2
1
10
9
NEU
GND
N/O
N/C
NEU
GND
N/O
N/C
NEU
GND
N/O
N/C
NEU
GND
N/O
N/C
Relay
1
Relay
2
Relay
3
Relay
4
Relay
5
R1
R2
R3
R4
R5
Incoming
Power Fuse
15 amp
H N G
Incoming
Power
Relay Fuses
are 3 amp
Relays are shown configured for powered outputs.
[ Change jumpers to these configurations for dry contact. ]
Relays
1-3
Relays
4 & 5
Relay Card
Rev N
R1
R2
R3
R5
MegaTron relay card revision N adds a 15 amp fuse on the incoming power
to the board and small LED’s for each realy to indicate when the motherboard
has called for it to be activated.
Rev N Relay Board
NEU
GND
N/O
N/C
R4
LED
LED
LED
LED
LED
1
2
3
5
4
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