It is abbreviated as Heating, Ventilation,
and Air Conditioning System.
Being interconnected and grouped
together, this mechanical system
provides thermal comfort and air quality
in an indoor space.
The System includes Boilers, Heat
Pumps, Chillers and Air Conditioners
and Packaged System.
HVAC operations and maintenance
These are the practices, which keeps
the mechanical systems to work at a
high performance during the life time of
A perfect designer can make the
process easy the maintain the
comfortable thermal system.
HVAC O&M is measured in terms of
The HVAC system must offer thermal comfort
continuously, at the energy use specified in
the design for the building.
Continuous commissioning is the best
operation that improves the energy
performance by 20%.
It also improves the comfort at the equivalent
But, the main thing is design of the HVAC
system. The perfect design will make the
system to execute properly.
As the technology improves, performance can
High quality operations are ensured by good
design process and regular maintenance.
The designer first of all have to create a
manual for the operating staffs which specifies
the intent clear design, maintenance list,
replacement palms and all other necessary
The manual should clearly explain the
parameters that are conducted during
Without manual, the work is never effective as
it may cause many troubleshoot to the
Maintenance plays the important role in O&M
Schedules for duct filer and all other
component cleaning, replacing must be
specified and followed to have ensure better
energy use and comfort as well.
Performance of the system have to be
measured monthly or quarterly, which helps
the operators to collect information for the
Some buildings are built up with the
automation systems, which records status of
Flexibility and Occupant
It is important to cope with the
requirements of the users by ensuring
the safety and efficiency.
Arrival heater and desk fans to the
customer’s place is an indication of the
failure of the HVAC system, which fails
to satisfy the customer’s need.
This denotes the faults or changes in the
original HVAC design and finally results
in the product change for the occupant’s
Filter Cleaning &
Filters plays the important role in the Air
They must be cleaned periodically to keep the
energy and indoor air quality in a high range.
Some filters can be cleaned in simple ways
like spraying water or vacuuming.
Rest of them, needs replacement. Like filters
in the ducts, filters of the furnace, heating
pumps and other parts must be checked.
Filters requires regular cleaning in the HVAC
system, for a long time efficient performance.
Like filters, other components in the system
needs regular cleaning as well.
Ducts must be inspected regularly for the
accumulation of the mold, dust and other
For best indoor air quality, they must cleaned
and inspected for the leakage, as it may
cause energy loss.
Coils with dust particles restricts the air flow
which in turn reduces the convective cooling
of the system.
Drains of the dehumidifying parts must be
checked, as it may cause the condensed
water to pool up and leaks in the building.
mold and mildew.
Operation of Control Systems
Programmable Thermostat schedule the
heating and the cooling of the HVAC System.
Those Schedules must match the occupancy
and the activity of the system and must be
changed in accordance to the age of the
Temperature, Occupancy, Humidity calculating
sensors should be checked regularly for the
Improper working Sensors may be
inconvenience to the users.
Improperly tuned control system are manually
disable by the HVAC system, as the energy
Diagram for Duct routing and control should
be created and kept for the assurance of
It also helps in resolving troubleshoot
problems and improving the system
performance by regular upgrades.
HVAC units, sensors, ducts, air handling
components, controllers, and their
interconnection are specified in the system.
For better readability, sensors and control
diagrams are separated often.
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