YORK INTERNATIONAL
26
Installation
FIG. 29 – JACK SHAFT CRANK ARM POSITION
FIG. 30 – TORQUE REQUIREMENTS TO OPERATE
VARIABLE INLET VAN (VIV)
TYPICAL CURBPAK OPERATION IN “HVAC” SYSTEM
The operation of these units can be divided into sys-
tems:
1. Ventilation system
2. Economizer system (return air/mixing box section)
3. Heating system
4. Cooling system
Economizer System - Typical
The Economizer System could typically consist of:
1. Outdoor and return air dampers
2. Damper Actuator
3. Enthalpy Control
4. Minimum outdoor air adjustment
5. Exhaust Air Control
The Economizer system provides the first stage of cool-
ing whenever the outdoor air is cool and dry enough to
satisfy the internal cooling demand. The outdoor and
the return air dampers are operated by individual ac-
tuators. As the outdoor air dampers are opened by the
damper actuator, the return air dampers are closed.
If the economizer operation cannot satisfy the space
demand for cooling, cooling stages can be energized as
needed.
Cooling Operation
Various types of cooling may be utilized. Factory
mounted chilled water coils or direct expansion refrig-
erant coils may be specified for the CurbPak unit.
Heating Operation
Various types of heating may be applied. Hot water or
steam coils maybe specified typically. Electric heat and
fuel burner heat are available.
ELECTRICAL INFORMATION
All wiring must conform to the Na-
tional Electrical Code (N.E.C.) and
possible local codes that may be in ad-
dition to N.E.C.
LD06348
LD06349
UNIT SIZE TORQUE (In/Lbs)
215 180
250 198
305 216
350 240
400 300
460 336
530 396
680 544
860 688
1030 824
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