General Information; Introduction; Unpacking; Equipment Description - Generac Power Systems rtsy100a3 Owner's Manual

General Information

1.1

INTRODUCTION

This manual has been prepared especially for the purpose of familiar-
izing personnel with the design, application, installation, operation
and servicing of the applicable equipment. Read the manual carefully
and comply with all instructions. This will help to prevent accidents or
damage to equipment that might otherwise be caused by careless-
ness, incorrect application, or improper procedures.
Every effort has been expended to make sure that the contents of this
manual are both accurate and current. The manufacturer, however,
reserves the right to change, alter or otherwise improve the product
or manual at any time without prior notice.
1.2

UNPACKING

Carefully unpack the transfer switch. Inspect closely for any damage
that might have occurred during shipment. The purchaser must file with
the carrier any claims for loss or damage incurred while in transit.
Check that all packing material is completely removed from the switch
prior to installation.
1.3

EQUIPMENT DESCRIPTION

The automatic transfer switch is used for transferring electrical
load from a UTILITY (NORMAL) power source to an GENERATOR
(STANDBY) power source. Such a transfer of electrical loads occurs
automatically when the UTILITY power source has failed or is sub-
stantially reduced and the GENERATOR source voltage and frequen-
cy have reached an acceptable level. The transfer switch prevents
electrical feedback between two different power sources (such as
the UTILITY and GENERATOR sources) and, for that reason, codes
require it in all standby electric system installations.
The transfer switch consists of a transfer mechanism, UTILITY SER-
VICE DISCONNECT circuit breaker, a control relay, fuses, terminal
strip, and fuse holder for connection of sensing wires.
This transfer switch is suitable for use as service equipment.
1.3.1 TRANSFER SWITCH MECHANISM
These switches (Figure 1.1) are used with a single-phase system,
when the single-phase NEUTRAL line is to be connected to a Neutral
Lug and is not to be switched.
Solderless, screw-type terminal lugs are standard.
Switch Wire
Rating Range
100A #14-1/0 AWG
200A #6-250 MCM
This transfer switch is suitable for control of motors, electric discharge
lamps, tungsten filament and electric heating equipment where the
sum of motor full load ampere ratings and the ampere ratings of other
loads do not exceed the ampere rating of the switch and the tungsten
load does not exceed 30 percent of the switch rating.
This UL listed transfer switch is for use in optional standby systems
only (NEC article 702).
2
Conductor Tightening
Torque
50 in-lbs.
275 in-lbs.
This transfer switch is suitable for use on a circuit capable of 22,000
rms (200A) and 10,000 (100A) symmetrical amperes, 240 VAC
maximum.
Figure 1.1 — Typical ATS Transfer Mechanism
UTILITY
CLOSING
COIL
GENERATOR
CLOSING
COIL
1.3.2 UTILITY SERVICE DISCONNECT CIRCUIT BREAKER
The utility service and generator disconnect circuit breakers for the
100 amp models are:
• Type BQ, 2-pole
• 120/240VAC, 100A
• 50/60 Hertz
• Heating, Air Conditioning and Refrigeration (HACR) rated
• Wire range: #1 - #8 AWG.
• The conductor tightening torque is 50 in-lbs.
The utility service circuit breaker for the 150/200 amp models are:
• Type 225AF, 2-pole
• 120/240VAC, 150A/200A
• 50/60 Hertz
• Wire range: 300 MCM - 6 STR (Line), 250 MCM - 6 STR (Load
- ATS)
• The conductor tightening torque is 375 in-lbs. (Line), 275 in-lbs.
(Load - ATS)
1.3.3 OVERLOAD PREVENTION CONTROL BOARD
(OPCB)
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.
UTILITY LUGS
GENERATOR
LUGS (E1 & E2)
LOAD LUGS (T1 & T2)