IM 1285-4 • MICROTECH III 8 www.DaikinApplied.com
Installation
Relays
High Pressure Switch 1 (HP1), High Pressure Switch 2 (HP2),
High Pressure Switch 3 (HP3), and High Pressure Switch 4
(HP4) each require a relay to indicate a high pressure alarm
on the MT III. If any of the High Pressure Switches open, their
respective relay will de-energize and the set of dry contacts
will open. This will open the circuit to generate a high pressure
alarm on the MT III. The R63 relay is necessary to indicate
when the DHL switch is open. The R11 relay is required as
part of the Water Flow Switch function. Slide the six 24 VAC
relays onto the DIN rail. Spacers can be used to separate the
MT III Expansion Modules from the relays. See
Figure 7
for an
example how the four relays are mounted on the DIN rail
NOTE:
If the unit does not have a Water Flow Switch or one
is not required, relay R11 is not necessary.
The number of High Pressure Switch relays required
depends upon the number of compressors/circuits in
the unit. Add or remove relays from the installation as
necessary. See the wiring section of this manual for
more information on where to wire additional relays
for more than four compressors.
Terminal Blocks
In order to ensure organization and accuracy when wiring,
five terminal blocks are required to be installed in the control
panel of the unit. Each terminal block needs to be mounted
on a DIN rail and is assembled by sliding each of the singular
pieces together to form a block. Use the end plates to hold the
terminal block pieces in place. The table below designates how
many pieces are needed for each terminal block assembly. The
white strip that designates the terminal numbers snaps into
place in the center of each terminal block. See
Figure 8
and
Figure 9
for an example of the singular terminal block pieces
and an assembled terminal block.
NOTE:
Mechanical jumpers need to be installed across the
bottom of each of terminal blocks, except TB3, in
order to create an equal potential through the block.
See
Figure 15
.
Table 3: Terminal Block Quantities
Terminal Block Name
Purpose
Number of Pieces
TB1A
115 VAC +
2
TB1B
115 VAC Common
2
TB2A
24 VAC +
8
TB2B
24 VAC Common
8
TBG
Ground
5
TB3
General
50
Figure 8: Single Terminal Block Pieces
Figure 9: Assembled Terminal Block
