Product Manual

TP-6946 3/1640 Section 4 Communication and Accessory Connections
4.4 Heater
Hazardous voltage.
Will cause severe injury or death.
Disconnect all power sources before
opening the enclosure.
DANGER
Servicing the transfer switch. Hazardous voltage can
cause severe injury or death. Deenergize all power sources
before servicing. Turn off the main circuit breakers of all
transfer switch power sources and disable all generator sets
as follows: (1) Press the generator set off/reset button to shut
down the generator set. (2) Disconnect power to all battery
chargers. (3) Disconnect all battery cables, negative (--) leads
first. Reconnect negative (--) leads last when reconnecting the
battery cables after servicing. Follow these precautions to
prevent the starting of generator sets by an automatic transfer
switch, remote start/stop switch, or engine start command
from a remote computer. Before servicing any components
inside the enclosure: (1) Remove all jewelry. (2) Stand on a
dry, approved electrically insulated mat. (3) Test circuits with a
voltmeter to verify that they are deenergized.
An anti-condensation heater kit is available. The strip
heater is controlled by a hygrostat to raise the
temperature inside the enclosure above the dew point to
prevent condensation. Figure 4-22 shows a typical
location of the heater kit components inside the
enclosure.
The installer must connect 120 VAC power to the
terminal block near the hygrostat. See Figure 4-23 and
Figure 4-24. The heater and hygrostat are connected to
power through a 15-amp circuit breaker.
The relative humidity setting on the hygrostat is
adjustable from 35% to 95%. A setting of 65% is
recommended.
1. Hygrostat assembly, see Figure 4-23
2. Strip heater with guard
1
GM69824
2
Right Side View
Figure 4-22 Heater Location, Typical
1. 120 VA C power connection terminal block
2. Circuit breaker
3. Relative humidity adjustment control
GM71056
3
2
1
Figure 4-23 Hygrostat Assembly, Typical