IM 986-2 / Page 43 of 48
Optional Remote Sensor
(P/N 66720401)
The fast, easy solution for temperature sensing problems.
• For tamper prone areas
• Poor airflow areas
• Troubled applications
• Foam gasket prevents drafts through
wall opening
• Mounts to standard 2" x 4" outlet
box
• 2¾"W x 4½"H
1 . Remove cover from remote sensor housing .
2 . Select an appropriate location for mounting the
remote sensor .
3 . Mount remote sensor unit using hardware provided .
4 . Install two strand shielded wire between remote
sensor and thermostat . Shielded wire must be used .
Do not run remote sensor wire in conduit with other wires .
• Wire 1 should run between the S1 terminal on the
thermostat and the S1 terminal on the remote sensor
• Wire 2 should run between the S2 terminal on the
thermostat and the S2 terminal on the remote sensor
• Connect the shielding of the wire to the S2 terminal
on the thermostat
5 . Disable the main sensor (R12) on the thermostat by
cutting it from the circuit board .
Motorized Isolation Valve & Relay
The motorized valve kit may be ordered as a field-
installed accessory .
Wired as shown in Figure 60, the motorized valve will
open on a call for compressor operation . Valves for unit
sizes 009 to 018 are 1/2" .
Using a Normally Closed (N/C), power open valve,
wire as illustrated in figure 61.
Figure 60: Normally Closed, Power Open Motorized Valve
& Relay Wiring
Figure 61: Normally Closed, Power Open Motorized Valve
& Relay Wiring Detail
Note: Connectors on valve must be cut off and
stripped back and the wires twisted to make
connections to the IV/PR Terminals
Pump Restart Relay Kit P/N 061419001
The MicroTech III unit controller has an internal Pump
Restart Relay connected to H8, Pin 2 for the Normally
Open (N/O) terminal of the internal relay .
Connect to H8, Pin 1 for the Normally Closed (N/C)
terminal of the internal relay .
The output of the internal pump restart relay is 24-
volts AC and the output is not available when the H8
connection is used to control a motorized valve .
Actuator &
Valve Assembly
Anti-short Bushing
Connector
Conduit
Pin(s), female
connect to terminal H8
Connector
Anti-short
Bushing
Summary of Contents for IM 986-2 VHC
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