18 August 1998
a. Piping systems which require addition of flow measuring devices will have pump characteristics
verified to determine that any additional pressure drops will not affect the system performance.
b. New valves required to implement UMCS application programs will include installation of any
isolation valves needed to provide for valve maintenance and service. Valves for UMCS include chilled
water valves, hot water valves, and steam valves. Two position valves installed in steam lines will be
provided with bypass lines or other means to keep sufficient heat in the piping to prevent thermal shock
when the valves are reopened. Operators installed on steam line valves will have the capability for
manual operation, such as a handwheel. Pumps will be added and piping modified to zone particular
areas for night setback and summer-winter operation, depending on the site specific requirements. For
example, domestic hot water pumps would continue to operate during the summer while space heating
pumps would be shutdown.
a. Chiller enable/disable and multiple chiller selection by UMCS must be coordinated with the
installation following the chiller manufacturer's guidelines and system specific operating constraints.
b. The implementation of UMCS applications such as chiller water temperature reset and condenser
water temperature reset require interfacing with existing controllers which may need to be replaced to
provide the CPA function.
c. Monitoring of chiller operating parameters can be accomplished either by interfacing with an
existing control panel (via a communication interface or a hardwired interface) or by adding specific
UMCS sensors (such as refrigerant pressures). The sensor selection will be made after consulting with
the chiller manufacturer. In some cases it may be more practical to install a new chiller control panel
provided by the chiller manufacturer than to install UMCS specific sensors.
d. All chiller installations must have refrigerant-specific leak detection monitoring systems that also
provide local and visual indication and alarm. The UMCS designer must coordinate with the installation in
the selection of the appropriate leak detection system taking into consideration planned phasing out of
existing refrigerants and their replacement.
a. Boiler enable/disable (either automatic or manual based on UMCS program outputs) and multiple
boiler selection must be coordinated with the installation for the specific needs of the boiler installation
and safety codes. Some installations will not allow remote start of boilers.
b. Control of boiler bypass control valves must be coordinated with the boiler manufacturer for
reduced flow operation limits.
c. Monitoring of boiler operating parameters can be accomplished by either interfacing with an
existing control panel or by adding interposing relays in series with existing boiler monitoring panel
annunciator lights for common or specific alarm conditions.
d. Selection and installation of boiler specific flue gas analytical instrumentation must be coordinated
with the boiler manufacturer.
a. Air handling systems to which the economizer program is applicable must have 100 percent OA
intake and relief air capabilities. New OA intakes will be provided for systems which do not have the
capability to handle the 100 percent OA flow. New return and relief air fans will also be required to pull
the air back from occupied spaces. The cost of HVAC equipment modifications will be compared with the
cost savings from the economizer program to determine if the economizer program is cost effective.