Chapter hvac engineering Fundamentals: Part 1 Introduction

11.3.2
Split-system AHU
The split-system AHU consists of two packages. The outdoor section
includes a refrigeration compressor, condenser (usually air-cooled),
and condenser fan. The indoor section includes the evaporator cooling
coil, heating element, supply fan, and air filter. Control of outside air
for ventilation is not usually included. The two sections are field-
connected through refrigerant piping and electric wiring. Controls are
included, but some field wiring is necessary. Heating may be obtained
by means of any conventional fuel, usually gas, oil, electricity, or
rarely, hot water from a central plant. Split-system heat pumps are
common. Split systems are usually small, ranging up to 15- or 20-ton
capacity.
Equipment: Part 3
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