LAARS MC4EXT - Install and Operating Manual - Manual (Page 2)

LAARS HEATING SYSTEMS Page 2
1.2 Mounting the Output Cards
The Output Cards are mounted on the rear of the
MCX (see Figure 1).
Each Output Card controls two stages. The two
stages connected to one Output Card must have the
same type of output (135
Ω, 0-5V, 1-5V, 0-10V, 2-
10V, or 4-20mA). However, different types of Output
Cards can be combined on the MCX, and each Output
Card can be programmed differently.
Align the Output Card with the pins on the back
of the panel and gently press them on until the top of
the pins appear through the Output Card connector.
1.4 Attaching the Connecting Cable
to the MC
Remove the MC from its enclosure.
Secure the remaining Header cable to the
enclosure as described above.
On the rear of the MC, locate JP4 and attach the
three screw terminal connector.
Return the panel to its enclosure, replace the top
screw, and tighten the bottom two screws.
Reattach the Panel-to-Panel cable to the Header
cables.
1.5 Wiring the Power
Bring the 120VAC 60Hz power wires through a
bottom Knockout of the enclosure. The right front
Knockout is preferred.
Class 1 voltages must enter the enclosure
through a different opening from any Class 2 voltage
wiring.
Connect the hot line to terminal marked LINE.
Connect the neutral line to the terminal marked
NEUT.
The green ground screw MUST be connected to
earth ground (see Figure 5).
1.3 Attaching the Connecting Cable
to the MCX
Disconnect the Panel-to-Panel cable from the
two Header cables (see Figure 3).
Remove a Knockout from the enclosure.
Insert the end of the Header cable with three
screw terminals through the Knockout into the interior
of the enclosure.
Use the mounting holes to secure the square end
of the Header cable to the enclosure.
Connect the three screw connector to the black
header on the rear of the MCX marked J12 (see
Figure 1).
Return the panel to its enclosure, replace the top
screw, and tighten the bottom two screws.
1.6 Installing the Output Relays
Each output stage (E through L) which is to be
used must have a relay installed in the socket. These
relays are ordered separately (p/n CA002300).
To install a relay, orient the pins and then press it
gently into the appropriate socket.
Any stage output which does not have a relay
must have its Mode set to Off (see MC I/O manual,
Stage Settings).
1.7 Wiring the Stage Outputs
Each Stage output (E through L) has one
Normally Open (N.O.) relay contact.
The N.O. contacts are dry contacts only. They do
not source any voltage.
Each N.O. contact is capable of switching 6A
resistive at 120VAC.
Total output of all stages must not exceed 15A.
Wire the N.O. relay contacts in series with the
unit’s limit circuit (see Figure 6).
Figure 3. Cable Connections.
Panel-to-Panel Cable
Mounting
holes
Header
Cabl
e
To header
MCX
or
MCX
J12
JP4
Figure 4. MC Rear View.
MC REAR VIEW
JP4
Output C&D
Output A&B
Fuse
Figure 5. Power Wiring.
SAFETY
GROUND
MUST BE
CONNECTED
Earth
Ground
Neutral
Line
120VAC
60 Hz