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3.2

15602-3
STEAM HEATING SYSTEMS
PIPING AND SPECIALTIES

be anchored where necessary to control expansion.

E. Install a sufficient number of unions for disassembling pipe around equipment of this
Division and other Divisions.

F. Install piping pitched for proper condensate drainage.

G. Install pipe hangers to properly support all equipment and piping. Maximum span
between hangers shall be 10 feet. Hangers shall be sized so insulation passes through
hangers.

H. Sleeves and Plates:

1. Pipes passing through masonry walls or floors shall have sleeves sized to
provide %4-inch minimum annular space, all insulation shall pass through
sleeves except where gas-tight calking is required.

2. All holes through concrete plank shall be drilled in such locations as not to
weaken plank structurally.

3. | Where exposed pipes pass through finished walls, floors, ceiling, etc. provide
and set split cover plates.

I. Provide adequate support for all heating equipment installed. Furnish and install any
required inserts, braces, hangers, miscellaneous steel, etc. as may be required for
installation.

J. Install dielectric unions at junction of pipes of dissimilar metals.

K. Install control measurement and valves in piping systems that are supplied by other
trades.

L. Provide unions to allow removal of all control valves.

TESTING AND BALANCING

A. Perform a hydrostatic pressure test on all piping and equipment.

B. Test pressure shall be 100 psi or 1-1/2 times the working pressure, whichever is
greater.

C. Repair, replace and rework as required to repair any defects and retest for approval.

D. All testing shall be performed prior to installation of insulation. Test systems in
sections as required to prevent delay of the project.

E. Operational Test: Upon completion of installation of all equipment and acceptance

of tests and balancing perform a 24-hour operational test in the presence of the
Engineers and Owner's representative to demonstrate proper operation of all functions
of the equipment and system.

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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

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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.

Other Trades: The automatic temperature control trades shall coordinate and
supervise other trades whose work affects the control systems.

Work Performed by Other Trades: The following incidental work shall be furnished
by the designated trade under the supervision of the automatic temperature control
(ATC) trade:

1. The heating/cooling trades shall:

a. Install automatic valves and separable wells that are specified to be
supplied as a portion of the control systems.

b. Furnish and install all necessary: valved pressure taps, water, drain and
overflow connections and piping.

2. The sheet metal trades shall:

a. Furnish and install all automatic dampers.

b. Provide necessary blank-off plates required to install dampers that are
smaller than duct size.

c. Assemble multiple section dampers with required interconnecting
linkages and extend required number of shafts through duct for external
mounting of damper motors.

d. Provide necessary sheet metal baffle plates to eliminate stratification and
provide air volumes specified. Locate baffles by experimentation and
affix and seal permanently in place only after stratification problem has
been eliminated.

e. Provide access doors or other approved means of access through ducts for
service to control equipment.

1.2 QUALITY ASSURANCE

A.

B.

The system shall be installed, tested, and balanced by competent mechanics regularly
employed by the temperature control manufacturer.
Acceptable Manufacturers:

1. Honeywell.

2. Johnson Service Co.
3. MCC Powers

4. Barber-Coleman

5. Robertshaw

6. or equal

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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.

Electric wiring diagrams showing all wiring, and equipment including all inter-
connections on a terminal to terminal basis. Refer to ladder wiring diagrams
shown on the Drawings. Note any discrepancies due to actual system
submitted.

Panel layouts for all local and central panels, and panel sizes.

Valve and damper operator schedule showing size, configuration, capacity and
location of all equipment.

A detailed explanation of any control system that is different, or will function
differently than that specified.

14 JOB CONDITIONS
Scheduling of Work: Schedule all work so as not to delay the work of other trades.

A.

PART 2 - PRODUCTS

2.1 MATERIALS

General: The control system shall consist of all thermostats, temperature transmitters,
controllers, automatic valves and dampers, damper operators, control panels, and
other accessory equipment to fill the intent of the specification and provide for a
complete and operable system. All 24 volt control wiring shall be provided by the
automatic temperature control contractor as shown or required to provide a complete
system. Refer to Drawings for electrical wiring and interlocks. All panels and
devices shall meet the NEMA electrical classification of the space in which they are
installed. See Drawing Sheet E-1 for NEMA schedule.

Electric Line- Voltage Industrial Thermostat:

A.

Furnish and install industrial/heavy commercial grade, Line-Voltage type
thermostats in NEMA 12, 3R, 4/4X process and production areas capable of
directly activating heating or cooling equipment.

Thermostat shall be wall mounted in a heavy duty metal enclosure. The
enclosure shall meet the NEMA requirements of the are in which they are
installed. Minimum rating shall be dust tight, NEMA 12.

Switching shall be SPST with a minimum rating of 16 Full Load Amps (FLA)
and 80 Locked Rotor Amps (LRA) at 120 VAC or the full load rating of the
device(s) to be activated, whichever is greater.

Differential shall be fixed 3-5 deg. F.

Bulbs shall be corrosion resistant, shielded and either locally or remote mounted
as required.

Covers shall have temperature set point adjustment knob except when
concealed or removable key adjustment is noted. Scale range shall be 40 to 100
°F unless described otherwise in the control description under paragraph 3.1.

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Police

The undersigned CLIENT acknowledges that he/she has thoroughly read, approved and accepted
each of the provisions contained herein and acknowledges receipt of a copy hereof. This is a legally
binding Contract. If the CLIENT does not understand any part of it, CLIENT should consult an
attorney before execution.

CLIENT POLICEAPP.COM

Signature of Authorized Representative date Signature of Authorized Representative date

Sean Cassidy President

Print name Title

Print name Title

Nashua Police Department
28 Officer James Roche Drive

Nashua, NH 03062 5 Brookside Drive
Wallingford, CT 06492

URL: www.policeapp.com

* By signing, the above individual represents that he/she is a duly
authorized representative of the CLIENT having the requisite
authority to enter into this Agreement.

POLICEAPP.COM / Nashua, NH agreement - PAGE 6 of 8

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.

The temperature controller shall be programmable for staged on-off heating and
cooling control with front mounted program pushbuttons with LCD backlit
display to show current temperature, setpoint and programming modes.
Temperature controller shall be wall mounted in a metal enclosure. The
enclosure shall meet the NEMA requirements of the area in which they are
installed. Minimum rating shall be dust tight, NEMA 12.

Power shall be 120 VAC with battery backup or programmed parameter stored
in non-volatile memory.

The controller will include a minimum of four (4) form C contacts rated a
minimum of 5 amps at 120 VAC.

Differential shall be programmable from 1-5 °F.

Temperature sensor shall be a shielded and water tight platinum RTD
temperature sensor mounted external to the control enclosure or remotely
mounted as required.

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.
Equivalent to:

a. Honeywell Model T775

b. Or equal

Commercial Room Thermostat:

l.

Furnish and install commercial grade thermostats in office and administrative
areas capable of controlling heating, cooling and ventilation. Provide cover
guards in publicly accessible areas.

Low voltage temperature controllers shall be programmable for multistage 7-
day heating and cooling control with front mounted program pushbuttons and
LCD backlit display to show current temperature, setpoint and programming
modes.

Temperature controller shall be wall mounted.

Power shall be 24/120 VAC with real time clock and battery backup or
programmed parameter stored in non-volatile memory.

Temperature sensor shall be a thermistor or RTD sensor internal to the unit.

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.

Duct and Immersion Thermostats:

l.

Duct and immersion thermostats of the single input type shall have integral
setpoint adjustments and throttling ranges adequate for the application. Duct
thermostats shall have sensing elements of sufficient length and accuracy to
measure average duct temperature in each location.

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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.

4. — Sensors shall be of corrosion resistant construction, tamper proof, suitable for
mounting on a vibrating surface. If capillary, shall be temperature compensated
and armored or installed in protective tubing.

5. All sensing elements for water pipe mounting shall be furnished complete with
separable protecting wells filled with heat conductive compound. Sensors shall
be factory calibrated and tamper proof. If easily adjustable sensors are
provided, they shall be located inside metal enclosures with cylinder lock and
key to prevent unauthorized setting.

Low Temperature Safety Thermostat:

1. Electric: Low temperature safety thermostats shall have 20 ft. low point
sensitive elements (not averaging type) installed to cover the entire duct
area. These thermostats shall be two position manual reset type. Devices used
on integral coil face and bypass units shall have remote thermostat, and have
bulb in accordance with manufacturer's requirements.

High Temperature Safety Thermostat:

1. Electric: High temperature safety thermostat shall be duct mounted manual
reset type with adjustable setpoint. (75-165 degrees F).

Smoke Detectors:

1. Electric: Smoke detectors shall be of the duct-mounted, photo-electric
type. The units shall be of 120 volts with contacts or additional relays suitable
for the required safety shutdown sequence. The units shall have local alarm
indication, be of the manual reset type have an extra set of normally open and
normally closed contacts for use by the building fire detection system and be
compatible with the building fire detection system.

Thermometers:

1. A thermometer shall be located adjacent to each rigid stem thermostat. A dual
thermometer with liquid-filled remote system shall be mounted adjacent to each
remote bulb thermostat. Averaging bulb thermometers shall be used where
averaging bulb thermostats are required.

2. Provide duct-type thermometers in all fresh air intake, mixed air, return air, and
all supply fan discharges and elsewhere where noted or shown. Thermometers
shall have the proper range scales for the locations where installed.

3. Panel-mounted indicating thermometers shall be minimum two inches’
diameter.

Differential Pressure Controllers:

1. Static pressure regulators shall be direct or reverse acting as required with
adjustable setpoint and throttling range with field calibration capability.

Control Valves: Three-way, two-way, mixing, or diverting service as

required. Operator shall be electric. Valve pressure drop shall not exceed 7 feet water

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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.

2. Linkages shall be suitable to connect operator to damper leaves and transmit
full torque of motor. All necessary hardware shall be included with the
linkages.

3. Damper motors shall be quiet in operation and shall have ample power to
overcome friction of damper linkage and air pressure acting on louvers to
position dampers accurately and smoothly. The damper operator mounting
arrangement shall be outside the airstream wherever possible.

4. The operators shall be capable of operating at varying rates of speed to
correspond to the dictates of the controllers and variable load
requirements. The operators shall be capable of operating in sequence when
required by the sequence of the operation. The operators shall have external
adjustable stops to limit the stroke in either direction. The operator linkage
arrangement shall be such as to permit normally open or normally closed
positions of the dampers as required.

5. — Electric Operators:

a. On-off, reversing, or proportional as required.
b. Spring return to closed or open position as required.

6. Dampers associated with emergency generator cooling shall fail open on loss
of electrical power.

Miscellaneous Devices:

1. Provide all the necessary relays, positioners, clocks, transformers, etc. to make
a complete and operable system.

2. Locate these devices on local panel unless specified otherwise.

Miscellaneous Hand Switches and Indicator Lights:

1. Size: 30 mm

2. All indicator lights shall be 120V AC, LED with push to test option.

3. Reference Section 16900 for additional specifications.

4. Number of positions and nameplate legends shall be as indicated in Paragraph
3.1 of this specification.

Relays:

1. Pilot duty relays shall be Form C, UL listed, two (2) to four (4) pole relay with
DIN rail mounted base rated a minimum of 5 amps at 120 VAC. Relay shall
have indicator and mechanical test pushbutton.

2. Industrial relays or contactors shall be used to directly drive 120 VAC single
phase equipment.

3. Refer to Section 16900 for additional requirements.

Panels:

1. Panels shall be provided to enclose all relays, switches, and controllers as
required.

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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.

R. Gauges: Thermometers and pressure indicating gauges shall be provided as shown
on the Drawings and other points throughout the system where the visual indication
of temperature or pressure is required or will prove beneficial to operating personnel
in the operation of the control system. Gauges will not be required on room type
thermostats.

S. Timer/Controller: Repeat Reset Cycle Timers shall be rated 120 volts. The cycle
shall automatically reset to origin upon loss of power. The "ON" timing circuit shall
be continuously adjustable up to a period of 60 minutes. The "OFF" timing circuit
shall be continuously adjustable up to a period of 10 hours. Both circuits shall have
a minimum setting of 3% of range. Setting accuracy shall be 10% of range maximum.
Timer life shall have a warrantee through 10,000,000 operations (no load). An LED
cycle progress annunciator shall be provided with each timing circuit. Contacts shall
be NO and/or NC as detailed on the Drawings, and shall be rated 7 amperes at 125
volts. Repeat, Reset Cycle Timers shall be suitable for recessed panel mounting, and
shall be Automatic Timing Controls 342 series, or equal.

FY

PART 3 - EXECUTION

3.1 DESCRIPTION OF OPERATION
A. Packaged VAV Cooling Air Handling Unit (CRTU-1):

1. | Occupied/unoccupied schedule shall be programmed as provided by the owner.

2. Supply fan:

a. Occupied operation: The fan shall be energized and the integral variable
frequency drive shall modulate the fan speed as necessary to maintain a
0.75” WG static pressure in the supply duct upstream of the VAV terminal
boxes..

b. Unoccupied operation: The fan shall be de-energized.

3. Ventilation:

a. Occupied operation: The outside air damper shall be open to minimum
position and the return air damper open to maximum position to provide
ventilation air.

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.

4. Cooling: When the temperature rises above 60°F at the outside air temperature
sensor, or when the temperature at the outside air temperature sensor is above
50°F and the outside enthalpy is greater than the indoor enthalpy, CRTU-1 shall
be in cooling mode.

a. Occupied operation: The compressors and hot gas reheat shall
stage/modulate as necessary to maintain a discharge air temperature of
55°F (adj.) at the discharge air temperature sensor.

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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:

a. Smoke: If the associated duct smoke detector senses smoke in the air
stream; the RTU fans and compressors shall be de-energized; the return,
exhaust, and outside air dampers shall close; and an alarm and detailed
notification shall be sent to the SCADA system alerting the operator to the
condition.

b. Freeze protection: When the temperature at the discharge air temperature
sensor falls below 45°F (adj.), the outside air and exhaust air dampers shall
close, the return air damper shall open fully, and an alarm and detailed
notification shall be sent to the SCADA system alerting the operator to the
condition. When the temperature at the discharge air temperature sensor
rises above 45°F (adj.), normal operation shall resume.

B. Variable Air Volume Terminal Units (VAV):

1.

Integral digital controls shall operate the unit per the following sequence:

a. Occupied/unoccupied schedule shall be interlocked with CRTU-1.

b. Heating: When the temperature falls below 50°F at the outside air
temperature sensor, the VAV units shall be in heating mode.

i. Occupied operation: The primary air damper shall open to minimum
position.

ii. | Unoccupied operation: The primary air damper shall be closed.

c. Cooling: When the temperature at the outside air temperature sensor rises
above 50°F, VAV units shall be in cooling mode.

i. Occupied operation: The primary air damper shall modulate
between minimum and maximum position as necessary to maintain
the cooling setpoint, 74°F (adj.), at the zone temperature sensor.

ii. | Unoccupied operation: The primary air damper shall be closed. If
the temperature at the zone temperature sensor rises above 85°F
(adj.) The primary air damper shall open to maximum position and
a signal shall be sent to CRTU-1 that unoccupied cooling is required.

C. Packaged Heat Pump Air Handling Unit (CRTU-2&3):

l.
2.

Occupied/unoccupied schedule shall be programmed as provided by the owner.
Supply fan:
a. Occupied operation: the fan shall be energized and operating

continuously.
b. Unoccupied operation: the fan shall be de-energized.
Ventilation:

a. Occupied operation: The outside air damper shall be open to minimum
position and the return air damper open to maximum position to provide
ventilation air.

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