Section 2: General Information and Setup
Owner’s/Installation Manual for SMM 3
Section 2: General Information and Setup
Load Management Options
Load management systems are designed to work
together to prevent a generator from being overloaded by
large appliance loads. Options include:
• Smart Management Modules (SMM)
• Smart A/C Module (standard in single-phase 100-
800 Amp RTS transfer switches)
These options can be used in conjunction or separately.
Application Considerations
Generator overload condition is determined by generator
frequency. Loads are shed when frequency drops below
a preset value for a predetermined time.
A Smart Management Module (SMM) can be used
individually or in conjunction with a Smart A/C Module to
manage a combined total of eight loads. Smart
Management Modules operate independently when used
in conjunction with the Smart A/C module.
• Use Priorities A/C 1-4 on the Smart A/C Module as
the top priorities, then up to four Smart
Management Modules as Priorities 5-8.
• Use only select A/C priorities on the Smart A/C
Module as the top priorities, then use additional
Smart Management Modules as the remaining
priorities.
• To reduce the loads returned to the generator all at
once, it is best to set the SMM priorities to follow
after the last HVAC load has returned. This allows
the generator to accept loads gradually, reducing
the potential for additional nuisance load shed
events.
• A Smart Management Module can share a priority
with an A/C priority on the Smart A/C Module
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 2-1.
NOTE: For digital thermostats where a 24 VAC
thermostat wire is not available, an SMM must be used to
break the power at the HVAC load itself.
Smart Management Module
Any loads, including central air conditioners, can be
managed using a Smart Management Module (SMM).
The system can accommodate up to eight individual
SMM modules.
NOTE: SMM modules are self-contained and have
individual built-in controllers.
Smart A/C Module
(Inside Transfer Switch)
Up to four air conditioner loads can be managed by the
Smart A/C Module. The Smart A/C Module 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.
Priorities A/C 1-4 (A in Figure 2-1) 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 Smart A/C Module (B in
Figure 2-1), illuminate when the output is activated to
enable the load.
The Smart A/C Module has a test button used to simulate
an overload condition (A in Figure 2-2). This button
operates even when the transfer signal is inactive.
Smart Management
Module
<58 Hz for 3.5 seconds
or <50Hz for 1 second
Smart A/C Module
<58 Hz for 3 seconds or
< 50Hz for 0.5 seconds
Table 2-1. Priority Settings
Priority Recovery Time
Smart A/C
Module
Smart
Management
Module
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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