Generac Power Systems Automatic Transfer Switch Owner's Manual page 7

Control of Air Conditioner Load
1. Route the thermostat cable (from the furnace/thermostat to
the outdoor air conditioner unit) to the transfer switch.
2. Connect the wire to the terminal strip terminals (Air 1) on
the OPCB as shown in Figure 2.2. These are normally closed
contacts which open upon load shed conditions. Route ther-
mostat wire away from High voltage wires.
3. If required, connect the second air conditioner to the terminal
strip terminals (Air 2).
Contact Ratings
Air 1 & 2
These instructions are for a typical air conditioner installation.
Control of heat pump and 2-stage air conditioners will require
special connections or the use of Power Management Modules
to control the loads.
24 VAC, 5.0 Amps Max
NOTE:
Figure 2.2 — Overload Prevention Control
Y wire
A/C 1 & LOAD 1
A/C 2 & LOAD 2
LOAD 3
LOAD 4
Control of a Separate Contactor
A separate contactor relay module can be purchased from the
manufacturer. This model is supplied in a 24 VAC (tequires a
starter kit, which includes a field installed 24VAC transformer and
the first 50 amp, 24V actuated module) or 120 VAC coil version.
1. Mount the contactor module and connect the load to the main
contacts.
2. Connect the contactor coil to the desired OPCB (contactor 1,
2, 3 or 4) terminals on the terminal strip.
3. Connect additional Power Management Module contactors in
a similar fashion.
It will be necessary to determine the order of "shedding" the
connected loads and connect the loads to the OPCB in that
order. One is the highest priority and four is the lowest priority.
LOAD
1
0 Ground
SUPPLY
194 +12V T1
NEUTRAL
23 Transfer
LOAD
2
SUPPLY
A/C 1
1
24V
LOAD 1
2
1A MAX
A/C 2
1
24V
LOAD 2
2
1A MAX
1
LOAD 3
2
1A MAX
1
4
LOAD
2
1A MAX
Installation
NOTE:
Supply
PMM #1
Supply
PMM #2
Coil wires
Supply
PMM #3
Supply
PMM #4
Load #1
Load #2
Load #3
Load #4
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