Installation Instructions

3
1.3.3 LOAD SHED MODULE (LSM)
The Overload Prevention Control Board is designed to prevent an
overload on the generator when it is supplying the customer loads.
See Figure 1.2. Up to six loads can be managed by the OPCB; 2
air conditioner loads and 4 other loads. The OPCB manages the
loads by “shedding” the connected loads in the event of a drop in
generator frequency (overload). Loads to be “shed” are grouped in
4 priority levels on the OPCB.
• Priority 1 and 2 has connections for both one air conditioner
and one contactor. Both an air conditioner and a contactor
can be used at the same time if desired. To control an air
conditioner, no additional equipment is required. Internal relays
interrupt the thermostat 24VAC control signal to disable the air
conditioner load.
• Priority 3 and 4 have connections for one contactor only.
• Four LEDs, located on the Overload Prevention Control Board,
will indicate when a load priority level is enabled. When loads
are connected, the LEDs will be illuminated.
• Any loads, including central air conditioners, can be controlled
via a contactor that must be purchased separately. Up to four
contactors can be controlled by the Overload Prevention Control
Board. (The 24 VAC or 120 VAC is supplied through the OPCB
to energize each contactor coil).
• Generator overload condition is determined by generator fre-
quency. Loads are shed when the frequency is <58Hz for 3
seconds or <50Hz for ½ Second (for 60Hz).
The OPCB has a Test button which forces the unit to act as if an
overload has occurred. This button operates even when the trans-
fer signal is inactive.
Figure 1.2 — Overload Prevention Control Board
0 Ground
194 +12V
23 Transfer
T1
NEUTRAL
A/C 1
24V
A/C 2
24V
LOAD 1
LOAD 2
LOAD 3
LOAD
4
A/C 1 & LOAD 1
LOAD
SUPPLY
LOAD
SUPPLY
1
2
1
2
2
2
2
1
1
1
1A MAX
1A MAX
1A MAX
1A MAX
A/C 2 & LOAD 2
LOAD 3
LOAD 4
Air Conditioner Connections:
Up to two A/Cs can be
controlled here via their low
voltage thermostat wires
Status LEDs: Shows which
loads are currently allowed to
run
Load Connections: Up to four
loads of any type can be
controlled via these
connections. A separate
contactor module is required
2
2
1
2
1
2
1
2
2
1
1
1.4 TRANSFER SWITCH DATA DECAL
A DATA DECAL is permanently affixed to the transfer switch enclo-
sure. Use this transfer switch only with the specific limits shown
on the DATA DECAL and on other decals and labels that may be
affixed to the switch. This will prevent damage to equipment and
property.
When requesting information or ordering parts for this equipment,
make sure to include all information from the DATA DECAL.
Record the Model and Serial numbers in the space provided for future
reference.
MODEL #
SERIAL #
1.5 TRANSFER SWITCH ENCLOSURE
The standard switch enclosure is a National Electrical
Manufacturer’s Association (NEMA) and UL 3R type. UL and
NEMA 3R type enclosures primarily provide a degree of protection
against falling rain and sleet; undamaged by the formation of ice
on the enclosure.
1.6 SAFE USE OF TRANSFER SWITCH
Before installing, operating or servicing this equipment, read the
SAFETY RULES (inside front cover) carefully. Comply strictly
with all SAFETY RULES to prevent accidents and/or damage to
the equipment. The manufacturer recommends that a copy of the
SAFETY RULES are posted near the transfer switch. Also, be sure
to read all instructions and information found on tags, labels and
decals affixed to the equipment.
Two publications that outline the safe use of transfer switches are
the following:
• NFPA 70; National Electrical Code
• NFPA 70E; Standard for Electrical Safety in the Workplace
• UL 1008, STANDARD FOR SAFETY-AUTOMATIC TRANSFER
SWITCHES
NOTE:
It is essential to use the latest version of any standard to ensure
correct and current information.
General Information