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Fig. 31 — Auxiliary Control Box Location
(50MP70M Unit Shown)
VARIABLE
FREQUENCY
DRIVE
DUCT PRESSURE
TRANSDUCER
BUILDING PRESSURE
TRANSDUCER
(HIDDEN)
Fig. 32 — Auxiliary Control Box
FACTORY
INSTALLED
TUBING
DPC
BPC
LO
HI LO HI
TO
BUILDING
PRESSURE
TO SUPPLY
DUCT
FIELD
INSTALLED
TUBING
TO OUTDOOR
REFERENCE
PRESSURE
PORT
LEGEND
BPC — Building Pressure Controller
DPC — Duct Pressure Controller
Fig. 33 — Air Pressure Tubing Locations
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