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Section 3
Thermostat Installation
Horizontal 2" x 4"
Junction Box
Step 1. Install the Wiring Mount in the desired location using the junction box screws provided, making
sure the wires go through the center opening . An optional wall plate (sold separately) is available for
mounting to other junction box configurations .
Step 2. Connect the wiring to the ST100ZB Back Plate . Use the chart below to identify the desired
configuration . Schematic diagrams for 4-Pipe, 2-Pipe and 2-Pipe Applications are provided on the
following page .
Table 3.2: Wiring Configuration Checklist
Configuration
2-Pipe Heat Only
2-Pipe Cool Only
2-Pipe Heat/Cool
Manual Changeover
2-Pipe Heat/Cool
Seasonal Changeover
2-Pipe Heat/Cool
w/Auxiliary Heat
4-Pipe Heat/Cool w/Manual
or Auto Changeover
=Required / o=Optional / W=Heat Valve Actuator / Y=Cool Valve Actuator / A=Auxiliary Heat
* If using more than one (Tp/Tx/Ts) terminal, it may be necessary to splice Tc.
Module 5 – Connected Fan Coil Controls
ST100ZB Line Power Fan Coil Thermostat
Vertical 2" x 4" Junction Box
(wall plate sold separately)
L
N
WY
W
Y
W/Y
W/Y
W/Y
W
YA
Gl
Gm
Gh
A
Y
4" x 4" Junction Box
(wall plate sold separately)
Ac
Ac
Tp
Tx
o
o
o
o
o
o
o
o
o
o
o
o
o
o
o
o
o
o
o
o
o
o
Ts
Tc*
o
o
o
o
o
o
o
o
o
o
3-3
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