Chapter hvac engineering Fundamentals: Part 1 Introduction


Designing for Operation



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HVAC HANDBOOK

2.9
Designing for Operation
and Maintenance
Over the life of the HVAC system, the operating and maintenance
costs of installed systems will greatly exceed the initial cost. The sys-
tem design can have a substantial effect on both energy and labor
costs. A system that is difficult to maintain will likely not be properly
maintained, with a consequent increase in energy costs or loss of sys-
tem function. The HVAC designer should observe the following basic
criteria.
1.
Keep it simple.
Complexity breeds misunderstanding and is a
seedbed for dissatisfaction, even failure.
2.
Provide adequate space and accessibility for equipment.
This in-
cludes ease of access, space for maintenance and repair, and access for
removal and replacement of large equipment items. Because this in-
volves the cooperation of the owner and the architect, the HVAC de-
signer must be prepared to justify the needs on a long-term economic
basis that takes into account the life-cycle cost.
3.
In the specifications, require written maintenance and operation
procedures.
A collection of manufacturers’ descriptive and main-
tenance bulletins is useful as a reference but is not a procedure. A
well-written operating or maintenance procedure should be simple
and straightforward, not longer than one or two pages, and easy for
personnel to understand and even memorize. Anything more complex
or lengthy simply will not be used. The schematic flow and control
diagrams from the contract drawings become primary reference ma-
terial for these procedures.
4.
Require the contractor to provide basic training for opera-
tors.
List the items to be covered and the training procedures. In this
connection, the HVAC designer should remind the building owner or
manager of the need for continued training and retraining of operating
and maintenance personnel. The manager has an economic stake in
HVAC Engineering Fundamentals: Part 2
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