Lennox GCS16-823

POWER EXHAUST
FAN PERFORMANCE
Air
Volume
(cfm)
4200
3800
3500
3200
2700
2200
Return Air System
Static Pressure
(inches Water Gauge)
0
.05
.10
.15
.20
.25
Exhausted)
TABLE 10
Page 50
2-EMDH16M Horizontal Economizer
(823, 953, 1353, 1603 only)
A separate horizontal economizer is available for 12.5 ton
and smaller units which require the use of an economizer
in combination with horizontal air discharge. Although the
EMDH16M is physically different than the REMD16M (fig
ure 52) both economizers are wired the same and are
identical in terms of function.
FIGURE 52
AVAILABLE FOR
12.5TON AND SMALLER
UNITS ONLY
OPTIONAL GED16
GRAVITY EXHAUST DAMPER
EMDH16M HORIZONTAL ECONOMIZER
FIGURE 53
TYPICAL EMDH16M SHOWN INSTALLED
Unit
EMDH16M
3-Economizer Accessories
a-GED16 Gravity Exhaust Dampers
(economizers not equipped with PED16)
Optional GED16 gravity exhaust dampers may be
connected to REMD16M or EMDH16M economiz
ers. Automatic exhaust dampers provide positive
pressure relief in return air duct. See figure 52.
b-PED16 Power Exhaust Damper
(1853, 2553, 2753, 3003 only)
Optional PED16
power exhaust
fans (figure 54) are
used in conjunction
with REMD16M
economizer to pro
vide forced ex
haust of return air.
PED16 consists of
two fans (figure 54)
which install in the
return air portion of
the economizer
and a control kit which installs in the unit filter section.
The PED16 is operated by a relay control kit (figure
55) located in the unit filter access section. A mercury
switch located on the damper blades senses econo
mizer operation. As the damper blades open the mer
cury switch (figure 58) closes and energizes a relay in
the control kit. When the relay is energized a set of
normally open contacts close and the PED16 ex
haust fans are energized.
PED16 fan motors use unit line voltage except in
575V units. 575V units use 460V fan motors. A 575V
to 460V transformer and fuse are provided in the
PED16 control kit to provide stepped-down voltage to
the fan motors.
The PED16 control kit (figure 55) and the economizer
enthalpy control (figure 63) are designed to be located
in the same area of the unit filter section simultaneous
ly. The enthalpy control is attached to a standoff
bracket which allows the PED16 control kit to be
installed behind as shown in figure 56.
FIGURE 54
PED16 POWER EXHAUST DAMPER
J18
P18
PED16
REMD16M
REMD16M
PED16
CONTROL KIT