Lennox GCS16 Series

Page 48
compartment. All connections are made with quick
connect type harness connectors. For specific de
tails of economizer wiring and operation, refer to the
sequence of operation section of this manual.
Figure 51 shows how an REMD16 is installed in a
GCS16 cabinet. Figure 52 shows how an EMDH16
is installed in a GCS16 cabinet. For detailed installa
tion and maintenance instructions, refer to the
REMD16-41/65 Installation Instruction Manual or
the EMDH16-41/65 Installation Instruction Manu
al.
FIGURE 51
REMD16 INSTALLATION
BLOWER
COMPARTMENT
DOWNFLOW
RETURN AIR
OPENING
REMD16
or
REMD16M
FIGURE
52
EMDH16 INSTALLATION
UNIT
EMDH16
or
EMDH16M
f-Modulating Damper Motor Check
Honeywell W7459A
1- Disconnect main power to the GCS16.
2- Turn thermostat control to OFF position (oc
cupied mode).
3- Install jumper across terminals 6-9 on blower
relay in unit control box.
4- Install jumper across enthalpy control termi
nals T and T1. See figure 53 for terminal loca
tion.
5- Restore power to unit. Outdoor damper
should drive to fully open position (60 to 90
sec. required for full travel). Observe travel for
proper damper operation.
6- Disconnect power to the unit. Outdoor damp
er should spring return to closed position.
7- Remove T and T1 jumper then restore power to
the unit. Outdoor damper should drive to mini
mum position. Adjust minimum damper position
pot located on control. See figure 53.
8- Disconnect power to unit and remove jumper
on blower relay terminals 6-9. Replace all
panels. Restore power to unit.
FIGURE 53
MODULATING
SOLID STATE ENTHALPY CONTROL
TR TR1
A
BC
D
+
+
5
2
4
T1
P1P
T
1
MINIMUM
POSITIONER
LED
3
g-ThreePositionDamperMotorCheck
Honeywell W7459C
1- Disconnect main power to the GCS16.
2- Remove the control access cover (see figures
46 and 47).
3- Install jumper across enthalpy control termi
nals D and TR1. See figure 54 for terminal
location.
4- Restore power to unit. Outdoor damper
should drive to fully open position (requires
approximately 90 seconds for full travel). Ob
serve travel for proper damper operation.
5- Disconnect power to unit. Damper should
spring return to closed position.
6- Remove jumper installed in step 3. Install
jumper across enthalpy control terminals X
and TR1. See figure 54 for terminal location.