HomeMy WebLinkAboutB14-0240_2014-130.230993 Sequence of Operation for HVAC Controls_1411771260.pdf CCD-2 18 SEPTEMBER 2014
SECTION 230993 - SEQUENCE OF OPERATIONS FOR HVAC CONTROLS
PART 1 - GENERAL
1.1 DESCRIPTION OF WORK:
A. Sequence of operation is hereby defined as the manner and method by which controls function.
Requirements for each type of control system operation are specified in this section.
B. Operating equipment, devices, and system components required for control systems are
specified in other Division 23 Controls' sections of these specifications.
PART 2 - PRODUCTS
2.1 SYSTEM REQUIREMENTS:
A. Provide control systems consisting of thermostats, control valves, dampers, operators,
indicating devices, interface equipment, and other apparatus required to operate mechanical
system and to perform functions specified.
B. Provide necessary materials and field work necessary to connect control components factory
supplied as part of equipment controlled, unless specified otherwise. Generally, self-contained
valves, filter gauges, liquid level controllers and similar instruments, are not to be installed under
this section.
C. Unless specified otherwise, provide fully proportional components.
D. Provide all necessary relays and signal boosters to make the system a full and operable system
as required by the sequence of operation.
PART 3 - EXECUTION
3.1 TERMINAL UNITS' CONTROL SEQUENCES:
A. Hot Water Heating Finned Tube/Baseboard: Provide wall mounted thermostat to automatically
modulate a normally open two-way control valve to maintain the thermostat setting. In rooms,
which also have a terminal-heating coil, thermostat shall sequence the FTR valve with the
heating coil valve to maintain stat set temperature.
B. Hot Water Heating Duct Coil: Provide wall-mounted thermostat to automatically modulate a
normally open two-way valve to maintain the thermostat setting.
C. Hot Water Heating Duct Coil HC-5: See Air Handler Control Sequences
D. Hot water Unit Heater: Provide unit-mounted thermostat to automatically modulate a normally
open two way control valve to maintain the thermostat setting.
3.2 TERMINAL BOX CONTROL SEQUENCES:
A. Constant Air Volume With Reheat(CURRENT OPERATION): The terminal box shall be utilized
for reheat only. On a drop in temperature below set point, the thermostat shall modulate the
reheat coil normally open two-way control valve to meet set point.
B. Variable Air Volume Without Reheat (FUTURE OPERATION): The thermostat shall control the
damper operator on the variable volume, pressure independent terminal box. On a drop or rise
13026.01 /Vail Valley Medical 230993 - 1 SEQUENCE OF OPERATIONS
Center Cath Lab FOR HVAC CONTROLS
CCD-2 18 SEPTEMBER 2014
in temperature below or above set point, the thermostat shall modulate the airflow between
minimum and maximum scheduled air quantities to satisfy the thermostat set point.
3.3 AIR HANDLER CONTROL SEQUENCES:
A. Air Handling Units:
1. The air-handling unit shall be controlled by a local DDC control panel interfaced with the
Building Automation System. The system shall be complete with access through local or
remote terminals.
2. The supply fan speed shall be modulated by the duct static pressure controller through
the local control panel and the variable frequency drive.
3. Duct heating Coil HC-5 serves as the heating coil for this system. Integrate heating coil
with air handling unit controls to operate utilizing the same thermostat for heating and
cooling.
4. When the room air temperature rises above room thermostat setpoint(adjustable), the
DX system shall enable to meet set point.
5. When the room air temperature falls below room thermostat setpoint (adjustable)the duct
heating coil shall enable to meet set point.
6. On detection of smoke from the unit mounted smoke detectors or on signal from the fire
alarm system, the supply and return fans shall cycle off and the outside air, return air and
exhaust air dampers shall close, and an alarm shall be sent to the Engineer's office.
7. On detection of high static pressure in the supply air or return air ductwork, the supply
and return fans shall cycle off, the outside air and exhaust air dampers shall close 100%
the return air damper shall open 100% and an alarm shall be sent to Engineer's Office.
3.4 SMOKE EXHAUST (ANESTHETIZING LOCATIONS)
A. Upon activation of two detectors in an anesthetizing location (cath lab), the smoke exhaust fan
EF-2 shall enable and AHU-1 shall disable. Provide a fire alarm system indication and control
panel where required by authority having jurisdiction.
3.5 EXHAUST FANS:
A. Exhaust air fan(s) shall run continuously with manual ON/OFF control through the Building
Management System.
3.6 HUMIDIFIERS:
A. On call for humidity from a system humidistat, the packaged humidifier steam generate will
operate under its own internal sequence to provide humidification to satisfy set point.
B. On high humidity, as sensed by a duct humidistat, the two-way modulating control valve shall
close and an alarm sent to the Engineer's Office.
3.7 PACKAGE TERMINAL UNITS CONTROL SEQUENCE:
A. Provide unit mounted thermostat to provide automatically change over cycling of the fan motor,
cycling of the refrigeration system for cooling, cycling of the electric heating element for heating
and night setback controls.
END OF SECTION 230993
13026.01 /Vail Valley Medical 230993 -2 SEQUENCE OF OPERATIONS
Center Cath Lab FOR HVAC CONTROLS