Page 42
NOTE - All economizer modes of operation will modulate
dampers to 55 F (13 C) supply air.
F-Gravity Exhaust Dampers
and LAGEDH are used in horizontal air discharge appli-
cations. LAGEDH gravity exhaust dampers are installed
in the return air plenum . The dampers must be used any
time an economizer or power exhaust fans are applied to
LGM series units. An exhaust hood is furnished with the
gravity exhaust damper.
Gravity exhaust dampers allow exhaust air to be dis-
charged from the system when an economizer and/or
power exhaust is operating. Gravity exhaust dampers also
installation instructions for more detail.
LAPEF
POWER EXHAUST
FAN ASSEMBLY
LAGED GRAVITY
EXHAUST DAMPERS
ECONOMIZER
FRESH AIR
HOOD
P18
LAGED AND LAPEF INSTALLATION
FIGURE 31
G-C1PWRE10 Power Exhaust Fans
applications only. C1PWRE10 fans require optional down-
-
mizers. Power exhaust fans provide exhaust air pressure
relief and also run when return air dampers are closed
and supply air blowers are operating. Figure 31 shows
the location of the power exhaust fans. See installation
instructions for more detail.
Electric heater is available to automatically control the
minimum temperature in the gas burner compartment.
The kit includes the following parts:
1 -
possible to the gas valve. The strip heater is rated
at 500 Watts (line voltage).
2 - A thermostat mounting box is installed on the
vestibule of the heating compartment. Included in
the box are the following thermostat switches:
a.
which opens on a temperature drop. The switch is wired in
series with 24v power and the combustion air blower switch.
switch opens and the gas heat section is de-energized. The
switch automatically resets when the heating compartment
b.
which opens on a temperature rise. The switch is wired in
series with K125 coil. When the temperature rises above
energized through K125. The switch automatically resets
c.
which closes on a temperature drop. The switch is wired in
through K125. The switch automatically opens when heating
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