Technical Requirements -
Mechanical/Plumbing/Electrical
8. A separate hot water boiler may be employed to heat the building, when it is not
economical to receive steam from the medical center boiler plant.
9. Electrical and Telephone/Data closets must be ventilated to maintain
temperatures below 90 degrees Fahrenheit. Passive ventilation dampers/fire
dampers vented to the above ceiling return or exhaust air plenum with suction in
the lower door are a minimum requirement. Mechanical cooling is required for
the main Telephone Equipment Room - this shall be powered from an automatic
transfer switch (ATS) from emergency generators if available. See Power and
Electrical for further details.
10. Computer room HVAC shall be by two (2) CRAC units (raised plenum floor
mandatory) with underfloor discharge to the plenum air space. Each CRAC unit
shall have capacity as described in the HVAC section above. A 12" minimum
(18" preferred) raised floor shall provide a plenum air space for cooling of the
computer room. A minimum of one perforated vent tile is required per ton of air
conditioning capacity (2x first stage compressor rating) to ensure adequate air
flow of approx. 500 CFM / ton of cooling. CRAC units shall be balanced to
provide design air flow and adequate humidification and shall release
accumulated heat to a closed loop cooling system (cooling towers, drycoolers or
chiller system may be utilized). This closed loop cooling system shall have built-
in redundancy (pumps/fans) and shall be backed up via an ATS switch to
backup emergency power if available. The two CRAC units shall be placed as
near as possible to opposite ends of the computer room and will have adequate
clearance for maintenance and door swing as a minimum. Placing the units on
opposite sides of the computer room allows for an even pressure distribution
and airflow and allows maximum space in the rest of the room for ADP
equipment. Consult Hines VABDC Engineering for specifications and
manufacturer information. CRAC units shall be powered from emergency power
via an ATS switch if available.
Plumbing and Fire Sprinkler
Provide complete plumbing and fire sprinkler systems to comply with applicable
codes and the current editions of VA Plumbing Design Manual, VA Fire Protection
Design Manual, VA Plumbing Master Specifications, and VA Construction
Standards for VA Regional Offices.
VBA Design Guide
Page 4-11
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