General Information
Automatic Transfer Switch Owner’s Manual 7
Smart A/C Module (SACM)
Up to four air conditioner loads can be managed by the
SACM. The SACM manages the loads by “shedding” the
connected loads in the event of a drop in generator
frequency (overload). Loads to be “shed” are in 4 priority
levels on the module.
See Figure 2-3. 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.
See Figure 2-3. The SACM has a test button (C) used to
simulate an overload condition. This button operates
even when the transfer signal is inactive. The Generator
Control Wiring is connected to terminals (D).
Figure 2-3. Smart A/C Module (SACM)
Smart Management Module (SMM)
(sold separately)
Any loads, including central air conditioners, can be
managed using a Smart Management Module (SMM).
The system can accommodate up to eight individual
SMMs.
NOTE: SMMs are self-contained and have individual
built-in controllers.
Figure 2-4. 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 ½ second
(for 60 Hz systems).
The SACM can be used in conjunction with individual
SMMs to manage a combined total of eight loads.
• 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: Priority Settings
.
Refer to the SMM Owner’s/Installation Manual for
detailed characteristics and specifications of that product.
1
1
1
1
2
2
2
2
T1N1N2
0 DC GROUND
194 +12 VDC
N1
N2
T1
23 TRANSFER
Replace with Littelfuse 021606.3XHP,
Optifuse FCD-6.3A or
Generac 10000005117 250 vac, 6.3A
®
®
Table 1. Priority Settings
Priority Recovery Time SACM SSMM
1 5 minutes Yes Yes
2 5 minutes 15 seconds Yes Yes
3 5 minutes 30 seconds Yes Yes
4 5 minutes 45 seconds Yes Yes
5 6 minutes NA Yes
6 6 minutes 15 seconds NA Yes
7 6 minutes 30 seconds NA Yes
8 6 minutes 45 seconds NA Yes
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