Page 49
7- Restore power to unit. Outdoor damper
should drive to mid (minimum) position (re
quires approximately 90 seconds for full trav
el). Adjust minimum position by turning thumb
wheel on damper motor.
8- Disconnect power to unit and remove jumper.
Replace all panels. Restore power to unit.
FIGURE 54
THREE POSITION
SOLID STATE ENTHALPY CONTROL
TR TR1
A
BC
D
+
+
5
2
4
X
D6
1
LED
3
S
O
S
R
h-Warm Up Kit
An optional warm up kit may be added to either
REMD16 or EMDH16 economizer (except GCS16s
using a Honeywell W7400 Control System). The
Warm Up Kit holds the dampers closed during night
setback and morning warm up. When the first ther
mostat demand of the day is satisfied, the warm up
kit opens the outdoor dampers to minimum position.
The warm up kit mounts to the GCS16 in the control
mounting area of the blower compartment. The kit
plugs into the unit wiring harness inline between the
unit and the economizer. For detailed wiring and op
eration, refer to the sequence of operation section of
this manual.
i-Night Relay
Optional night relay must be added to economizer
when night setback functions are desired with W973
or electromechanical control systems. Kit includes a
DPDT relay which is hardwired to the economizer
harness.
If a W973 system is used, the relay holds the out
door dampers closed during setback. If an electro
mechanical thermostat system is used, the relay
holds the outdoor dampers closed during setback,
deenergizes the indoor thermostat and energizes
the setback thermostat. Night relay is not required
for any other control system. Field wiring is shown in
the following section section of this manual. Night
relay wiring diagram designation is K11.
D-OAD16 Outdoor Air Damper
The OAD16 outdoor air damper section (figure 55) installs
in the GCS16R or GCS16 to allow a fixed amount of out
side air into the system. The OAD16 replaces the unit side
panel where a downflow economizer would normally be
installed. The dampers may be manually adjusted and
locked in place to allow up to 25 percent outside air into the
system at all times. Refer to the OAD16 installation in
struction manual for specific installation procedure. The
washable filter supplied with the OAD16 can be cleaned
with water and a mild detergent. It should be sprayed with
Filter Handicoater when dry prior to reinstallation. Filter
Handicoater is R.P. Products coating no. 418 and is avail
able as Lennox Part No. P-8-5069.
FIGURE 55
OAD16 FRESH AIR DAMPER
LOOSEN SCREWS AND
SLIDE DOWN TO ALLOW
MORE AIR INTO SYSTEM
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