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NOTE - All economizer modes of operation will mod
ulate dampers to 55_F (13_C) supply air.
F-Gravity Exhaust Dampers
C1DAMP50C dampers (figure 20) are used in downflow
and LAGEDH are used in horizontal air discharge applica
tions. 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 LCM se
ries units. An exhaust hood is furnished with the gravity ex
haust damper.
Gravity exhaust dampers allow exhaust air to be dis
charged from the system when an economizer and/or pow
er exhaust is operating. Gravity exhaust dampers also pre
vent outdoor air infiltration during unit off cycle. See
installation instructions for more detail.
FIGURE 20
LAPEF
POWER EXHAUST
FAN ASSEMBLY
LAGED GRAVITY
EXHAUST DAMPERS
ECONOMIZER
FRESH AIR
HOOD
P18
LAGED AND LAPEF INSTALLATION
G-C1PWRE10 Power Exhaust Fans
C1PWRE10 power exhaust fans are used in downflow appli
cations only. C1PWRE10 fans require optional downflow gravi
ty exhaust dampers and E1ECON15 economizers. Power ex
haust fans provide exhaust air pressure relief and also run
when return air dampers are closed and supply air blowers
are operating. Figure 20 shows the location of the power ex
haust fans. See installation instructions for more detail.
H-Optional Cold Weather Kit (Canada only)
Electric heater is available to automatically control the
minimum temperature in the gas burner compartment.
Heater is C.G.A. certified to allow cold weather opera
tion of unit down to ‐60° F (‐50° C ).
The kit includes the following parts:
7- The strip heater (HR6) is located as close as possible
to the gas valve. The strip heater is rated at 500 Watts
(line voltage).
8- A thermostat mounting box is installed on the
vestibule of the heating compartment. Included in
the box are the following thermostat switches:
a - Thermostat switch (S59) is an auto‐reset SPST N.C.
switch which opens on a temperature drop. The
switch is wired in series with 24v power and the com
bustion air blower switch. When the temperature
drops below ‐30° F (-35° C) the switch opens and the
gas heat section is de‐energized. The switch auto
matically resets when the heating compartment tem
perature reaches -10° F (-12° C).
b - Thermostat switch (S60) is an auto‐reset SPST N.C.
switch which opens on a temperature rise. The
switch is wired in series with K125 coil. When the
temperature rises above 20° F (‐7° C) the switch
opens and the electric heater is de‐energized
through K125. The switch automatically resets when
the heating compartment temperature reaches
‐10° F (23.3° C).
c -Thermostat switch (S61) is an auto‐reset SPST N.O.
switch which closes on a temperature drop. The
switch is wired in series with K125 coil. When tem
perature drops below 20° F (‐7° C) the switch closes
and electric heater is energized through K125. The
switch automatically opens when heating compart
ment temperature reaches 76° F (24° C).
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