Economi$Er Systems - Carrier 48HC D17 Series Service And Maintenance Instructions

ECONOMI$ER SYSTEMS

IMPORTANT: Any economizer that
economizer requirements as laid out in California's Title
24 mandatory section 120.2 (fault detection and
diagnostics) and/or prescriptive section 140.4 (life- - cycle
tests, damper leakage, 5 year warranty, sensor accuracy,
etc), will have a label on the economizer.
economizer without this label does not meet California's
Title 24. The five year limited parts warranty referred to
in section 140.4 only applies to factory installed
economizers. Please refer to your economizer on your
unit.
The 48HC units may be equipped with a factory- - installed
or accessory (field- - installed) EconoMi$er system. Two
types are available: with a logic control system
(EconoMi$er IV) and without
(EconoMi$er2). See Fig. 63 and Fig. 64 for component
locations on each type. See Fig. 65 and Fig. 66 for
EconoMi$er section wiring diagrams.
Both EconoMi$ers use direct- - drive damper actuators.
LEGEND
DCV— Demand Controlled Ventilation
IAQ — Indoor Air Quality
LA — Low Ambient Lockout Device
OAT — Outdoor-Air Temperature
POT — Potentiometer
RAT — Return-Air Temperature
meets the
Any
a control system
FOR OCCUPANCY CONTROL
REPLACE JUMPER WITH
FIELD-SUPPLIED TIME CLOCK
8
7
Potentiometer Defaults Settings:
Power Exhaust Middle
Minimum Pos. Fully Closed
DCV Max. Middle
DCV Set Middle
Enthalpy C Setting
Fig. 65 - - EconoMi$er IV Wiring
WIRING
HARNESS
ACTUATOR
Fig. 63 - - EconoMi$er IV Component Locations
ECONOMI$ER2
PLUG
BAROMETRIC
RELIEF
DAMPER
Fig. 64 - - EconoMi$er2 Component Locations
NOTES:
1. 620 ohm, 1 watt 5% resistor should be removed only when using differential
enthalpy or dry bulb.
2. If a separate field-supplied 24 v transformer is used for the IAQ sensor power
supply, it cannot have the secondary of the transformer grounded.
3. For field-installed remote minimum position POT, remove black wire jumper
between P and P1 and set control minimum position POT to the minimum
position.
53
ECONOMI$ER IV
CONTROLLER
OUTSIDE AIR
TEMPERATURE SENSOR
LOW AMBIENT
SENSOR
C06021
OUTDOOR
AIR HOOD
HOOD
SHIPPING
BRACKET
GEAR DRIVEN
DAMPER
C06022
C06028