OPTIONAL	10 May 1999	15915opt

UPDATES -

10 May 99	-	Added North Carolina equipment supplier.

2 Sep 98	-	Incorporated sequence of control, Section 15940, into this Section.

3 Jun 98	-	Deleted sensor guards, except in Cultural Center.

The standard Honeywell T7300 programable thermostat system is preferred in all cases. Adapt if necessary to fit the heating / cooling system used on the Projects other than Standard Plans. On addition / remodel Projects, the system for the new addition should generally use the T7300 system rather than extending the old system. It is also generally preferred that the existing system be replaced with the T7300 system rather than fixing up an existing system. Check with the Area Representative to establish scope of work before proceeding too far. Use the Church standard ATC diagrams, edited to fit Project requirements, in all cases.

This Section is used on the LEGACY 96 Standard Plan.

SECTION 15915

ELECTRIC AND ELECTRONIC CONTROL

PART 1 GENERAL

1.1	SUMMARY

A.	Includes But Not Limited To

1.	Furnish and install automatic temperature control system as described in Contract Documents.

2.	Furnish and install all raceway, conduits, and conductors and make connections to control devices and equipment as required to provide a complete and operating system.

3.	Furnish and install exposed raceway and conduit in Mechanical Rooms.

4.	Assist in air test and balance procedure.

B.	Related Sections

1.	Division 13 - Air Test & Balance	13352opt.a 13352opt.b

2.	Section 15051 - General Mechanical Requirements	15051

3.	Section 15816 - Furnishing and installing of temperature control dampers	15816

4.	Division 16 -

a.	Power wiring to magnetic starters, disconnect switches, and motors.

b.	Motor starters and disconnect switches, unless integral with packaged equipment.

1.2	SYSTEM DESCRIPTION

A.	Performance Criteria - Install line and low voltage electrical wiring, raceway, conduit, and boxes in accordance with Division 16 of these Specifications.

1.3	SUBMITTALS

A.	Closeout

1.	Project Record Documents - Provide two copies of record ATC diagrams.

Record Drawings

PART 2 PRODUCTS

2.1	COMPONENTS

A.	Room Thermostats

1.	Programable low voltage type provided with automatic change over feature for both heating and cooling stages, seven day program with two starts and stops per day, and provisions for damper operators.

2.	Approved Manufacturer And Model -	Approved Products

a.	Honeywell T7300F2010

B.	Remote Room Sensor

1.	Approved Manufacturer And Models -	Approved Products

a.	Single element with 3 Push Buttons, OVERRIDE, WARMER, COOLER - Honeywell T7147A2018

b.	Dual element with 3 Push Buttons, OVERRIDE, WARMER, COOLER - Honeywell T7147G2023

c.	Single element with Push Button Override - Honeywell T7147A2000

d.	Dual Element Without Push Button - Honeywell T7047G2008

2.	Switch SW-1 -

a.	SPDT sub-miniature switch

b.	Approved Manufacturers And Models -	Approved Products

1)	Radio Shack 'Archer', Cat. No. 275-635A, 6 amp / 125 v

2)	Sprague No Q5P-111701, 5 amp/120 v

C.	Safety Controls

1.	Ionization smoke detector mounted in supply and return air streams. Detector to operate on 24 volts AC.

2.	Install on systems greater than 2000 CFM.

3.	Approved Models And Manufacturers -	Approved Products

a.	Series 2650-450 ionization type, duct mounted smoke detector by Robertshaw.

b.	MS Series ionization type duct mounted smoke detector by Air Products Controls Ltd.

c.	Model DH400 ACDC duct mounted smoke detector by System Sensor, a Division of Pittway

d.	Model 0550 duct smoke detector by Maple Chase Co

D.	Sub-Base

1.	Approved Manufacturer And Models -	Approved Products

a.	Honeywell - Q7300D2010 - two stage heat and one stage cool.

b.	Honeywell - Q7300D2002 - three stage heat and two stage cool.

E.	Transformer

1.	120 / 24 volt, 50VA, foot mount

2.	Approved Manufacturer And Model -	Approved Products

a.	Honeywell AT87A1106

F.	Damper Actuators

1.	Electric type equipped for Class I wiring.

2.	Shall not consume power during UNOCCUPIED cycle and shall not use chemicals or expandable media.

3.	Have built in spring return.

4.	Approved Manufacturer And Model -	Approved Products

a.	Honeywell ML8175F1004 with end stop kit 205850B

G.	Conductors

1.	Color coded and No. 16 and No. 12 AWG Type TWN, TFN, or THHN, stranded.

2.	Thermostat Cable - 12, 8, or 4 conductor, 18AWG solid copper wire, insulated with high density polyethylene. Conductors parallel enclosed in brown PVC jacket.

H.	Obtain pre-built panels, thermostats, and other control equipment from following approved suppliers	Approved Products

Delete those suppliers who are a great distance from the Project site, leaving in at least three. No others are to be added without prior written approval of the Mechanical Group of A & E Services.

1.	Georgia - Stromquist & Co Inc, 4620 Atlanta Road, Smyrna, GA 30080 (404) 794-3440

PART 3 EXECUTION

3.1	INSTALLATION	Installation

A.	Interface With Other Work

1.	Calibrate room thermostats as required during test and balance procedures.

2.	Instruct test and balance personnel in proper use and setting of control system components.

B.	Run conductors and thermostat cable in conduit. No exceptions.

C.	Safety Controls

1.	Mount smoke detector in supply ducts of each heating and / or cooling system as shown on Control Drawings and interlock to keep heating and cooling from operating if detector is energized.

2.	Fresh air dampers shall close on fan shut-down, power failure, open fan motor disconnect switch, and when thermostat is in UNOCCUPIED mode.

3.	Low limit freeze protection to shut down fan operation when activated.

D.	Sequence of Control

1.	Roof Top Units -

a.	Programmable thermostat shall control unoccupied and occupied status of fan system based on adjustable seven day program and remote room sensor / push button. Fan shall cycle in unoccupied and occupied modes.

b.	Auxiliary fan cycle switch is provided by thermostat sub-base and is to be used to cycle fan in Occupied mode on both heating and cooling.

c.	Adjustable heating and cooling set points shall control space temperature by activating either heating or cooling equipment. Programmable thermostat provides automatic change over between heating and cooling.

d.	Remote room sensor with three pushbuttons provides optional override of thermostat program by allowing three hour timed override of thermostat program at any time by pushing selected point on remote room sensor cover. This shall activate thermostat to occupied mode and system shall control to occupied set point. The cooler and warmer buttons may be pressed to change the setpoint to a minimum pre-programmed temperature difference.

e.	Minimum outside air damper (spring return type) shall open in occupied mode and remain closed in unoccupied mode in zones using outside air.

f.	See drawings for locations of sensors.

E.	Laminate and paste record control wiring diagram on wall near thermostat location.

3.2	FIELD QUALITY CONTROL

A.	Field Service - Calibrate, adjust, and set controls for proper operation, operate systems and be prepared to prove operation of any part of control system. This work is to be completed before presubstantail completion inspection.

3.3	ADJUSTING

A.	Program minimum of one day's operation into thermostat's memory function.

END OF SECTION