Carrier EconoMiser X - Economizer Controller and Installation; W7220 Economizer Controller; Unit Installation

3
48HCDD24A3A5- 6U 0 G 0
Product Type
Product Series
1
Example:
Position: 2 3 4 5 6 7 8 9
10
11 12 13 14 15 16 17 18
Sensor Options
Indoor Fan Options & Air Flow Configuraitons
Coil Options (RTPF) (Outdoor - Indoor - Hail Guard)
Electrical Options
G = 2-Speed Indoor Fan (VFD)
Controller
Heat Options
Refrig. Systems Options
Cooling Tons
Packaging
Voltage
Design Revision
Base Unit Controls
0 = Base Electromechanical Controls
1 = PremierLink Controller
2 = RTU Open Multi-Protocol Controller
6 = Electromechanical Controls for Low Leak
Economizer Only
Service Options
Intake / Exhaust Options
A = None
B = Temp Economizer w/ Baro Relief
F = Enthalpy Econoizer w/ Baro Relief
K = 2 Position Damper
U = Temp Low Leak Economizer w/ Baro Relief
V = Temp Low Leak Economizer w/ PE (cent)
W = Enthalpy Low Leak Economizer
w/ Baro Relief
X = Enthalpy Low Leak Economizer w/ PE (cent)
C11547
Fig. 1 -- Model Number Nomenclature Example
EconoMi$er X
EconoMi$er X is a low leak economizer system which is
available for 2--stage cooling units equipped with the
Staged Air Volume (SAV) 2--speed Variable Frequency
Drive (VFD).
The factory--installed option consists of:
S Low leak economizer damper assembly
S Direct--drive damper actuator with local equipment bus
communications
S W7220 economizer controller with keypad and display
S Supply Air Temperature sensor (20K ohm)
S Outdoor changeover condition sensor (either 20K ohm
dry--bulb or enthalpy sensor)
Unit Installation
All damper hardware and standard economizer control
components except the enthalpy sensor are
factory--mounted in their operating location. Complete the
unit installation by relocating the enthalpy sensor (when
provided; see below), then assembling and mounting the
unit’s outside air hood. Refer to the base unit’s installation
instruction manual for directions on locating the hood
parts package and assembling the hood with filters.
Enthalpy Sensor Relocation –
See Fig. 10 for view of the enthalpy sensor. Locate the
enthalpy sensor on the side of the economizer housing;
remove mounting screws and save screws. Confirm the
DIP switches are set at OFF, OFF, OFF (see Table 9).
Move the enthalpy sensor to the front face of the
economizer housing and mount per label.
W7220 Economizer Controller
The economizer controller used on electro mechanical units
is the Honeywell W7220.
The W7220 provides typical economizer functions,
including:
S Management of outside air damper for base unit
Occupied (damper open and modulating) and unit OFF
or Unoccupied status (damper closed)
S Free--cooling using all outside air when outdoor
conditions permit Integrated cooling operation using
outside air and mechanical cooling when required
S Demand Control Ventilation (DCV) for modulating
ventilation airflow according to space CO
2
level
(requires factory--option or field--installed CO
2
sensor)
The W7220 control also includes a new capability that will
adjust the damper control points during DCV or minimum
ventilation operation as the indoor fan speed is changed.
This control function ensures that required space ventilation
airflow quantities are maintained during reduced fan speed
operation.
LLECON--02SI
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