CEMP-E
TI 811-12
18 August 1998
(d)
The type of controls used on the systems.
(e)
Method of condenser temperature control.
(f)
Chiller alarms and interlocks (if any exist) for future monitoring by the UMCS.
Survey Sheet 4, Refrigeration Equipment Survey Observations, lists noteworthy data.
(5) Domestic Hot Water. Domestic water heaters may be either direct fired using fossil fuels,
electric resistance, or receive heat from a central plant. Note the tank capacity, setpoint, heating input
and peak use periods. Survey Sheet 5, Domestic Hot Water Survey Observations, lists noteworthy items.
(6) Lighting. To accomplish lighting control through the UMCS, the power distribution system
configuration for the lighting circuits must be known. Identify the branch circuits in a building and note
local switching arrangements. Determine the lighting wattage for the building. Field verify the electrical
plans to make sure the lighting layout has not changed. Note whether delamping (which will reduce the
overall light wattage and potential UMCS savings) has been implemented. Survey Sheet 6, Lighting
Survey Observations, lists noteworthy data.
(7) Miscellaneous Equipment. There are a few systems which may be analyzed during the
survey which were not included in the above system descriptions. These systems include: (1) exhaust
fans, (2) water pumping systems, and (3) miscellaneous loads which could be cycled on predetermined
time schedules. Survey data required for exhaust fans include: (1) fan use (i.e. laboratory, toilet, etc.),
(2) horsepower, (3) capacity in cubic feet per minute (cfm), and (4) present and required operating
schedule. Other miscellaneous electrical or thermal equipment may not be routinely identified, but could
offer the potential for energy savings through UMCS control. For such equipment note the capacity and
present and required schedule of operation. There may be savings by shutting the equipment off during
hours when it is not required.
c. Verify Present and Required Operating Schedules. After inspecting the energy using equipment,
the most critical data to retrieve are operating schedules of the equipment. Most of the savings estimated
depend heavily on this information. Building and operational and maintenance personnel should be
interviewed to determine how the systems are currently operated. Are the fan systems deenergized
during unoccupied hours? Are the thermostats setback at night? Are there any existing timeclock
devices, and if so, do they work? Next, interview the building manager to determine the actual required
hours of operation for each system. If, for example, an AHU is only providing conditioning to spaces for
occupant comfort, then the system could be shut off during unoccupied hours. However, if the AHU is
providing ventilation for special equipment (i.e., laboratory, computer, or special process area) or
providing make-up air for exhaust systems, the AHU may need to operate 24 hours a day. See Survey
Sheet 7, Building Data Survey Observations, for a list of what data should be recorded for operating
schedules.
d. Identification of Equipment Modifications. If the implementation of the UMCS requires
modification of a piece of mechanical or electrical equipment, adequate information must be obtained
during the survey to develop a budgetary estimate of the cost for the modification. Areas where
mechanical and/or electrical modifications may be necessary include things such as:
(1)
Duct work additions or changes.
(2)
Piping additions or changes.
(3)
Additional fans or pumps.
(4)
Control circuit components.
(5)
Disconnect switches.
C-9
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