Specifications

IM 1059-1 / Page 27 of 36
Figure 36: Multiple Unit Control Panel and Board
The multiple unit control board provides the components
necessary to protect the MicroTech III controller from electri-
cal damage that may occur when using standard off-the-shelf
relays.
Do not use the unoccupied (U-terminal) feature with the
multiple unit control board.
Motorized Valve/Pump Restart Output
The MicroTech III controller output, IV/PR (H8) is
used to energize a motorized valve actuator or start a
water
pump,toallow100%waterowthroughtheunit
priortostartingthecompressor.Seegure21,page21
for wiring termination details. The output voltage is 24
VAC. A separate 24 VAC relay may be required between
the control board and the controller device depending
on power requirements.
Multiple Unit Control (up to 3 units) (P/N 056794201)
The multiple unit control board is an accessory used
when up to 3-units are controlled from a single thermostat.
Typically the control panel and board is centrally mounted
between the units and thermostat. A maximum of 2 boards
may be used together if up to 6-units must be connected and
controlled from a single thermostat. For detailed installation
instructions refer to IM 952.
This version of the control uses VAC relays and should not
be used in combination with any other accessories or equip-
ment that require VDC connections.
Figure 35: Wiring Multiple Unit Control Board (MUCP)
Multiple Unit Control Panel
Circuit Board
MicroTech III Unit Control Board
Low Voltage Terminal Strip
C
G
Y1
Y2W1
W2
A
R
O
Thermostat Terminals
W1
Y1
W2
Y2
G
-
C
+
R
R Y G W
R Y G W
R Y G W
R Y G W C
K3
K2
K1
TB3
TB4
TB2
TB1
C
G
Y1
Y2W1
W2
A
R
O
C
G
Y1
Y2W1
W2
A
R
O
TB2 - Unit #1
TB2 - Unit #2
TB2 - Unit #3
Notes:
Dotted lines represent low voltage (Class II) wiring; a color-coded thermostat cable is recommended.
MUCP may be mounted horizontally or vertically on heat pump cabinet or any convenient surface.
Do not use if using night setback.
Thermostat must be A.C. voltage.