CEMP-E
TI 810-11
30 November 1998
b. The HVAC control system specification.
(1) Because the HVAC control system designer has the responsibility to completely design the
control system, the specification requires more technical detail than would be required if the designer
needed to specify only the end performance result of control.
(2) The designer must specify extensive vendor submittal requirements. The submittals required
are shop drawings, commissioning procedures, operating and maintenance instructions, training course
documentation, a calibration/ commissioning/ adjusting report, testing documentation, and a list of
service organizations.
(3) The control devices to be used must be specified in detail.
(4) Because the control system is electronic and can interface with various EMCS, the
requirements for electrical surge protection devices installed in the system wiring must be specified, both
to protect the HVAC control system and to prevent surges on HVAC control system wiring from adversely
affecting the EMCS.
(5) Each control system must have a sequence of operation and a commissioning procedure.
c. Sequence of operation. Each control system will have a sequence of operation. The sequences
will be included in the project specification or they may be shown on the contract drawings. Where the
project HVAC systems are similar, the control loops and logic having identical control functions will be
described identically in the sequences. The text of the sequences will vary only to the extent necessary
to describe the operation of dissimilar control loops and logic.
d. Commissioning procedure. On projects that include HVAC system or building commissioning,
the contract specifications and requirements for control system commissioning and other commissioning
requirements shall be coordinated to support each other and ensure effective and accurate system and
subsystem operation in accordance with the design with minimum duplication or conflict. The project
specification for each control system will include a commissioning procedure. The commissioning
procedure is a four-step process that details how the vendor will inspect, calibrate, adjust, and
commission each HVAC control system. The types and quality of calibration instrumentation to be used
in the procedure and the extent of documentation of the procedure will be specified. Where project
HVAC systems are similar, the requirement for applying the procedure to control loops and logic will be
described identically in each procedure. The text of the procedures will vary only to the extent necessary
to describe the application of the commissioning procedure to dissimilar loops and logic. The four steps
of the commissioning procedure are as shown in table 1-1.
TABLE 1-1 - COMMISSIONING PROCEDURE
HVAC-System
Step
Activity
Condition
Purpose
1
System
Shut down
Observe system for position of valves and dampers, and
inspection
readiness of HVAC control panel.
2
Calibration
Shut down
Collect one data point for each sensing element,
accuracy
transmitter, and controller combination under steady-state
check
conditions.
1-10
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