15604-9
AUTOMATIC TEMPERATURE CONTROL (ELECTRIC)
G. Circulating Pump (GCP-1)
1. |The pump shall be energized and operate continuously when either GSF-1 is
energized and the outside air temperature is less than 50°F (adj.).
H. Heat exchanger (CHX-1 & GHX-1)
1. |The associated steam control valve shall open as necessary to maintain a heating
leaving water temperature in accordance with the following temperature
15604-8
AUTOMATIC TEMPERATURE CONTROL (ELECTRIC)
b. Unoccupied operation: The outside air dampers shall be closed and the
return air damper shall open fully.
c. The exhaust air damper shall be closed at all times unless economizer
operation is available and the outside air damper is open beyond the
required position for ventilation.
Cooling: When the outside air temperature rises above 60°F (adj.), or when the
outside air temperature is above 50°F (adj.) and the outside enthalpy is greater
5.
15604-7
AUTOMATIC TEMPERATURE CONTROL (ELECTRIC)
b. Economizer cooling: When the temperature at the outside air temperature
sensor falls below 60°F and the outside air enthalpy is less than the return
air enthalpy during occupied periods; the supply fan shall be in the
occupied mode; and the outside air, exhaust air, and return air dampers
shall modulate from minimum to 100% as necessary to maintain a
discharge air temperature of 60°F (adj.) at the discharge air temperature
sensor.
Safeties:
15604-6
AUTOMATIC TEMPERATURE CONTROL (ELECTRIC)
Required indicating and control devices shall be installed in the cover.
Terminal strips shall be provided for all electrical connections.
Panels shall be central and/or local as indicated or required.
5. Control Panels shall be provided in accordance to Section 16160.
Q.
15604-5
AUTOMATIC TEMPERATURE CONTROL (ELECTRIC)
column (w.c.). Control valves shall be sized by the ATC contractor.
Dampers:
1. All control dampers shall be furnished as part of Section 15862.
2. All dampers shall be installed by sheet metal trades.
Damper Operators and Linkages:
1. Damper operators shall be electric open-close or fully proportioning as
indicated or required.
15604-4
AUTOMATIC TEMPERATURE CONTROL (ELECTRIC)
2. Controllers shall be designed and constructed for equipment room use and shall
not be affected by ambient temperature and humidity.
3. | Duct mounted or immersion type shall have spans of one hundred degrees or
two hundred degrees Fahrenheit as required. Averaging element sensors shall
have a minimum nine-foot capillary element. Temperature sensors shall be of
rigid stem using bimetallic sensing elements except where averaging is
required.
7.
15604-3
AUTOMATIC TEMPERATURE CONTROL (ELECTRIC)
In areas of a building that comply with the Americans with disabilities act,
thermostats shall be mounted at a height of 48" above a finished floor.
Industrial Temperature Controller:
l.
Furnish and install industrial/heavy commercial grade, Temperature Controllers
in NEMA 12, 3R, 4/4X process and production areas capable of controlling
heating and cooling equipment through motor starters, variable speed drives,
industrial relays or other equipment control devices.
15604-2
AUTOMATIC TEMPERATURE CONTROL (ELECTRIC)
1.3 SUBMITTALS TO THE ENGINEER
A.
Shop drawings shall be submitted for approval as required by the General
Conditions. Shop drawings shall consist of, but not be limited to, the following:
l.
2.
3.
Manufacturer's literature for all equipment including maintenance and
operating instructions and parts lists.
Description of operation for all systems.
15604-1
SECTION 15604
AUTOMATIC TEMPERATURE CONTROL (ELECTRIC)
PART 1 - GENERAL
1.1 DESCRIPTION
A. Furnish, install and test an Automatic Temperature Control (ATC) system of the type
and function required on the Drawings and as herein specified.
1. Type of System: Electric.
Related Work Specified Elsewhere: "HVAC - General" is specified in this Division.
"Cabinets and Enclosures" is specified in Section 16160.
15602-4
STEAM HEATING SYSTEMS
PIPING AND SPECIALTIES
3.3 PAINTING AND IDENTIFICATION
A. All heating system piping, valves, pumps and equipment shall be painted and labeled
in accordance with Specification Section 09900.
END OF SECTION
13089K
