15619-2
GAS FIRED SEPARATED COMBUSTION AIR HANDLING UNITS
blower assembly, and electrical control unit with all specified components and
internal accessories factory installed and tested and prepared for single-point high
voltage connection.
2.3 CABINET
A. Materials: Formed, double wall insulated metal cabinet, fabricated to permit access
to internal components for maintenance.
15619-1
SECTION 15619
GAS FIRED SEPARATED COMBUSTION AIR HANDLING UNITS
PART 1 - GENERAL
1.1 DESCRIPTION
A. Work Included: Provide and install pad-mounted natural gas fired, separated
combustion makeup air unit of the type, size and performance as shown on the
Drawings and specified herein.
15604-12
AUTOMATIC TEMPERATURE CONTROL (ELECTRIC)
ATC SYSTEM TRAINING CERTIFICATION
Owner: Date:
Project:
Contractor:
ATC System Provider
Representative:
Equipment:
1. I have trained the Owner's personnel in the proper operation and maintenance of the above
equipment.
(Authorized Representative (Date)
of the ATC System Provider)
2. The personnel listed below attended the training session.
(Owner's Representative) (Date)
3. Witnessed by
3.5
3.6
3.7
15604-11
AUTOMATIC TEMPERATURE CONTROL (ELECTRIC)
Provide combined training and operational assistance for plant operators in the proper
operations of the ATC system equipment, and in the techniques, methods, schedules,
etc. associated with maintenance.
15604-10
AUTOMATIC TEMPERATURE CONTROL (ELECTRIC)
(4) The integral motorized backdraft dampers on each exhaust
fan shall open.
iii. Inactive:
(1) The fans shall be de-energized.
(2) Damper GD-1 shall open.
(3) | Damper GD-2 shall close.
(4) The integral motorized backdraft damper on each exhaust
fan shall close.
(5) The three-way heating control valve shall modulate as
necessary to maintain the heating coil discharge air
temperature setpoint (55°F adj.).
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.
