Load Management Devices; Power Relay Module - Kohler 14/20RESAL Installation Manual

2.3 Load Management Devices

Two optional load management devices are available
for use with single-phase generator sets and a model
RXT or RDT transfer switch:
The optional Load Shed Kit mounts inside a Model
D
RDT or RXT transfer switch. Figure 2-3 shows the
load shed assembly.
The combined interface/load management board is
D
available for the Model RXT transfer switch.
The devices provide an automatic load management
system to comply with Section 702.5 of NEC 2008. The
installer is responsible for ensuring that the power
system installation complies with all applicable state
and local codes.
Note: The load management devices are only
compatible with single-phase generator sets.
With a load management system, less critical
appliances can be powered by the generator set when
the more important appliances are not running, allowing
the use of a smaller generator set than would be needed
to run all of the building's electrical equipment at the
same time.
The load shed kit automatically manages up to six
residential loads:
Up to four normally closed power relays can be
D
connected through normally open relay contacts on
the circuit board. See the load shed kit installation
instructions for relay specifications. Kohlerr Power
Relay Modules are recomended.
Two relays are included on the load management
D
device to control
ventilation, and air conditioning (HVAC) loads.
Note: Connect only non-essential loads to the load
shed kit.
The load management device receives commands from
the RDC2 or DC2 generator controller and energizes or
de-energizes the appropriate load relays to add or shed
non-critical loads according to their priority.
An adequate electrical supply is required for operation
of the customer-supplied power relays connected to the
load shed kit. Check the electrical requirements of the
customer-provided equipment prior to installation to
determine the wire size and circuit protection required.
36 Section 2 Accessories
two independent heating,
Verify that customer-provided equipment complies with
applicable local and national electrical codes.
For detailed installation and connection instructions,
see the installation instructions provided with the load
shed kit or the Operation/Installation Manual for the
Model RXT transfer switch.
3
1. Terminal block TB10
2. Load control circuit board
3. Mounting bracket
Note: Kit includes current transformer (CT), not shown.
Figure 2-3 Load Shed Assembly GM88281-1
(mounts inside the transfer switch
enclosure)
2.3.1

Power Relay Module

The power relay module kit contains one 50 amp
normally closed relay with connecting lugs in a NEMA
type 3R enclosure. Connect up to four (4) power relay
modules to the load management devices listed above.
The power relay modules can be mounted indoors or
outdoors. Two (2) 120 VAC loads (shed simultaneously)
or a single 240 VAC load can be wired to each relay.
For detailed installation and connection instructions,
see the installation instructions provided with the power
relay module kit.
Figure 2-4 Power Relay Module
1
2
GM88281
TP-6803 6/15