Smart A/C Module (Sacm); Smart Management Module (Smm) (Sold Separately); Application Considerations - Generac Power Systems RTG24SHA1 Owner's Manual

Smart A/C Module (SACM)

See Figure 2-2. Up to four air conditioner loads can be
managed by the SACM. The SACM manages, or
temporarily disconnects, the connected loads in the
event of a drop in generator frequency (overload). Loads
to be managed are in 4 priority levels on the module.
Priorities A/C 1-4 (A) have connections for an air
conditioner. To control an air conditioner, no additional
equipment is required. Internal normally closed relays
interrupt the 24 VAC thermostat control signal to disable
the air conditioner load.
Four LEDs, located on the SACM (B), illuminate when a
load is connected and powered.
The SACM has a test button used to simulate an
overload condition. This button operates even when the
transfer signal is inactive.
0 GROUND
194 +12V
23 TRANSFER
A/C 1
A/C 2
B
A/C 3
A/C 4
Figure 2-2. Smart A/C Module (SACM)
Smart Management Module (SMM)
(Sold Separately)
See Figure 2-3. Any loads, including central air
conditioners, can be managed using a SMM. The system
can accommodate up to eight individual SMMs.
NOTE: SMMs are self-contained and have individual
built-in controllers.
Automatic Transfer Switch Owner's Manual
T1
NEUTRAL
A/C 1
A/C 2
A
A/C 3
A/C 4
000802
Figure 2-3. Smart Management Module (SMM)

Application Considerations

Generator overload condition is determined by generator
frequency. Loads are shed when frequency is less than
58 Hz for three seconds or less than 50 Hz for one-half
second (for 60 Hz systems).
The SACM can be used in conjunction with individual
SMMs to manage a combined total of 12 loads: eight
SMMs and four SACMs.
• Use Priorities A/C 1–4 on the SACM as the top
priorities, then up to four SMMs as Priorities 5–8.
•
Use only select A/C priorities on the SACM as the top
priorities, then use additional SMMs as the remaining
priorities.
• A SMM can share a priority with an A/C priority on
the SACM provided the generator is sized to handle
the combined surge load from both appliances.
Sharing priorities can allow up to 12 loads to be
managed in a properly sized system.
In any combination of modules, the recovery times after a
loss of utility power or shutdown due to overload are
shown in Table 1.
Table 1. Priority Settings
Priority Recovery Time
1 5 minutes
2 5 minutes 15 seconds
3 5 minutes 30 seconds
4 5 minutes 45 seconds
5 6 minutes
6 6 minutes 15 seconds
7 6 minutes 30 seconds
8 6 minutes 45 seconds
Refer to the SMM Owner's/Installation Manual for
detailed characteristics and specifications of that product.
General Information
000106
Smart
Smart A/C
Management
Module
Module
Yes Yes
Yes Yes
Yes Yes
Yes Yes
NA Yes
NA Yes
NA Yes
NA Yes
7