Complete Compiled Specification.pdf - Peck Ormsby Construction

4.3 BOILER OPERATION - HOT WATER SYSTEM
1. Boiler and associated pumps are enabled when OAT is less than 60 Deg F.
(adjustable). HW pumps shall be monitored with Current Transformers (CT) and
controlled by the BAS. HW supply and return temperature shall be monitored by a
stainless steel temperature sensor mounted in a Stainless Steel thermal well.
2. System Operation
a. There are 2 hot water heating pumps. Pumps ‘P-1’ and ‘P-2’ operate during the
OCCUPIED and WARM-UP modes and are each rated at 50% of the building load.
b. When the panel mounted toggle HAND-OFF-AUTO (H-O-A) switches are in the
AUTO position, these pumps will be controlled by the building energy management
system. During the OCCUPIED or WARM-UP modes, if the outside temperature is
below 72 degrees F., pump P1 will start. If the outside temperature is below 40
degrees F., both pumps P1 and P2 will start.
c. When the panel mounted toggle HAND-OFF-AUTO (H-O-A) switch is in the AUTO
position, the boiler is enabled by the building management system. The boiler will
be enabled whenever one or more of the heating pumps is running. Once
enabled, the boiler operates from its factory-furnished and installed operating and
safety controls. The DDC system will modulate boiler leaving hot water
temperature.
d. When the central air handling unit is off, the BAS shall command the hot water
valve closed.
e. If the room temperature falls below 50 Deg F. (adjustable), the BAS shall generate
an alarm.
f. A local DDC controller with analog temperature sensors located in both the supply
water and the outdoor air shall modulate thru the boiler control system the hot
water temperature to maintain building supply water temperature (reset from
outdoor temperature) as follows:
4.4 CULINARY HOT WATER SYSTEMS
OUTDOOR TEMPERATURE HOT WATER TEMPERATURE
70 degrees F. 90 degrees F.
0 degrees F. 180 degrees F.
A. When the starter or MCC mounted (H-O-A) switches are in the AUTO position, and any
of the fan systems is running in the OCCUPIED mode, a strap-on thermostat mounted on
the culinary hot water return line shall cycle domestic hot water pump to maintain 120 F
(initial setting) culinary return water temperature.
4.5 CHILLED WATER SYSTEM
A. When the starter or MCC mounted (H-O-A) switches are in the AUTO position, the chilled
water pumps shall be controlled by the building energy management system.
B. When the outdoor temperature is above 55 F, the chilled water pump shall start and run
continuously whenever a fan system is in OCCUPIED mode and the chilled water valve
is open more than 10%.
C. When the starter or MCC mounted (H-O-A) switches are in the AUTO position, the chiller
shall be enabled to operate under its factory supplied controls to maintain the discharge
water temperature as reset by the building energy management system.
D. The chiller will not start unless the chilled water pump is running and chilled water flow
has been proven by a paddle type water flow switch. A BTU meter will measure the
SEGO LILY ELEMENTARY SCHOOL CLASSROOM ADDITION
AUTOMATIC TEMPERATURE CONTROLS 15900-13