Carrier 50CD - Page 10

vent air needed and record quantity for vent
adjustment in step 11.
5. R e move jumper plug from base unit receptacle
and discard. Insert economizer plug into recep¬
tacle. See Fig. 15.
Steps 6 thru 8 involve releasing and adjusting
indoor damper blades from factory set position.
Fig. 14 — Outdoor Air Hood Details
ECONOMIZER
PLUG
CLS — Cooling Lockout Switch
EC — Enthalpy Control
OAT. — Outdoor Air Thermostat
OUTDOOR AIR
INLET SCREENS (2)
Fig. 15 — Economizer Installed in Unit
6. R e lease indoor blades’ drive linkage by loosen¬
ing linkage connector setscrew at indoor crank-
arm on drive shaft. See Fig. 16.
Remove pink wire from economizer damper
motor terminal D and temporarily tape bare
wire end.
Remove violet wire from economizer damper
motor and connect to terminal D on economizer
damper motor. See Fig. 17.
OUTDOOR BLADES(2)
DRIVE
SHAFT
OUTDOOR DRIVE LINKAGE
Fig. 16
INDOOR
BLADES (3)
Economizer Details
ECONOMIZER
DAMPER MOTOR
PINK WIRE
VIOLET WIRE
TERMINAL D
Fig. 17 — Economizer Motor Connections
7. Jumper red (base unit 24-v power) and black
(evaporator fan motor) wires in 24-volt control
box compartment. See Fig. 10.
Turn on base unit power to energize evap¬
orator fan. The economizer’s outdoor blades
should open completely.
8. Adjust the indoor blades’ drive linkage so that
indoor blades are fully closed. Tighten the
linkage connector setscrew. Turn off base unit
power. Reconnect pink and violet wires to
economizer motor, as shown in Fig. 17.
9. If vent air is required, leave red and black wires
jumpered. If vent air is not needed, remove
jumper between red and black wires.
10. Fasten baffle to left side of damper plate with
round head screws provided. See Fig. 18.
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