Control Of Air Conditioner Load; Control Of A Separate Contactor; Load Shed Module Connections - Generac Power Systems RTS automatic Technical Manual

Control of Air Conditioner Load

1. Route the thermostat cable (from the furnace to the outdoor
air conditioner unit) to the transfer switch.
2. Connect the wire to the terminal strip terminals (Air 1) on
the LSM 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.
Figure 2.1 — Load Shed Module Connections
Y wire
Priority 1 Priority 1
Priority 2 Priority 2
Priority 3 Priority 3
Priority 4 Priority 4
24 VAC, 5.0 Amps Max
NOTE:
0 Ground 0 Ground
194 +12V 194 +12V
T1 T1
23 Transfer 23 Transfer
NEUTRAL NEUTRAL
AIR 1 AIR 1
CONTACTOR CONTACTOR
1 1
AIR 2 AIR 2
CONTACTOR CONTACTOR
2 2
CONTACTOR CONTACTOR
3 3
CONTACTOR CONTACTOR
4 4

Control of a Separate Contactor

A separate contactor relay module can be purchased from the
manufacturer. If a different relay is used it must have a 120 Vac
coil voltage. The LSM supplies a fused (5A) 120 Vac to energize
the coils of the relay contactors (L1, L2, L3 and L4).
1. Mount the contactor module and connect the load to the main
contacts.
2. Connect the contactor coil to the desired LSM L1-L4 terminals
on the terminal strip.
3. Connect additional load shedding contactors in a similar fash-
ion.
It will be necessary to determine the order of "shedding" the
connected loads and connect the loads to the LSM in that order.
One is the highest priority and four is the lowest priority.
Supply
Contactor #1
Supply
Contactor #2
Coil wires
Supply
Contactor #3
Supply
Contactor #4
NOTE:
Installation
Load #1
Load #2
Load #3
Load #4
5