Installation Instructions

3
• 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 (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
controller 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 below
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 (indoor/outdoor rated) 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.
Three 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.
2.1 INTRODUCTION TO
INSTALLATION
This equipment has been wired and tested at the factory. Installing
the switch includes the following procedures:
• Mounting the enclosure.
• Connecting power source leads and load leads.
• Connecting the generator sensing and transfer relay circuits.
• Connecting any auxiliary contact (if needed)
• Connect Overload Prevention Control Board loads (as required)
• Testing functions.
2.2 MOUNTING
Mounting dimensions for the transfer switch enclosure are in
this manual. Enclosures are typically wall-mounted. See the
“Installation Diagram”.

Handle transfer switches carefully when install-
ing. Do not drop the switch. Protect the switch
against impact at all times, and against con-
struction grit and metal chips. Never install a
transfer switch that has been damaged.
Installation