Specifications

Zone Thermostat - ModStat

Installation

Wiring

All 24-volt and communication wiring connections are made to terminal blocks on the thermostat

sub-base. The communication terminal block (RX TX/RX TX) is designed as a junction for two sets

of 22 ga. solid copper, twisted pair communications cable. The cable should be daisy chained from

thermostat to thermostat (use Belden 8740).

1. Install the thermostat sub-base on an interior wall away from direct sunlight, supply air currents,

or any heat generating source. Mounting screws and anchors are provided. The sub-base

may be installed on a vertical 2x4 electrical box.

2. Connect the control wires from the ModStat's R & C, to the GEN II controller (F). Verify R & C

polarity is the same on each thermostat (18 ga. Thermostat wire).

3. On the ModStat, connect the damper output wires from C-MC, RC and RO to the actuator

motor terminals. NOTE: For MODS2, terminal RO is not used.

4. Connect the RX TX communication wires on the right hand terminal block; there are 2 sets of

RX TX terminals to make the daisy chain wiring easier.

NOTE: The communication wire must be twisted pair Belden 8740, 8450 (shielded) or

82442 (plenum rated).