H41.REV

ELECTRIC HEATING

NOTE: FINAL COPY: JUNE, 1988.

Part -	GENERAL

NOTE: THIS SECTION MUST BE CAREFULLY COORDINATED WITH THE ELECTRICAL DEPARTMENT. IT MAY BE DESIRABLE OR NECESSARY TO INCLUDE SOME OF THE EQUIPMENT UNDER THE ELECTRICAL WORK. LOCAL UNION REGULATIONS AND LOCAL ORDINANCES SHOULD BE CHECKED AS TO WHETHER CERTAIN EQUIPMENT SHOULD BE INCLUDED UNDER MECHANICAL OR ELECTRICAL WORK

NOTE: REVIEW WIRING DIAGRAMS WITH ELECTRICAL DEPARTMENT TO CLARIFY RESPONSIBILITY OF EACH DEPARTMENT

NOTE: WATER TREATMENT SECTION SHOULD CONTAIN TREATMENT SUITABLE FOR ELECTRODE AND RESISTANCE TYPE BOILERS

WORK INCLUDED

Work included in this Section includes the providing of labor, materials, equipment and services necessary for a complete and safe installation in accordance with the contract documents and all applicable codes and authorities having jurisdiction for the following

NOTE: EDIT AS REQUIRED.

Steam boiler - electrode type.

Steam boiler - resistance type.

Hot water boiler - electrode type

Hot water bioler - resistance type.

Electric resistance heating coils.

Forced flow heaters.

Unit heaters.

Cabinet heaters.

Direct radiation.

Cabinet convectors.

RELATED WORK AND REQUIREMENTS

Requirements of GENERAL CONDITIONS DIVISION No. 1 and Section GENERAL PROVISIONS FOR HEATING, VENTILATING AND AIR CONDITIONING WORK apply to all work in this Section

NOTE: EDIT TO SUIT PROJECT REQUIREMENTS. INCLUDE ONLY SECTIONS DIRECTLY AFFECTING WORK OF THIS SECTION

Related work in the following Sections:

PACKAGED ROOF-TOP UNITS.

AIR HANDLING SYSTEM EQUIPMENT.

AUTOMATIC CONTROL SYSTEMS.

WATER TREATMENT.

INSULATION.

MOTORS.

MOTOR CONTROLLERS.

-----.

REFERENCE STANDARDS

Published Specifications' standards, tests or recommended methods of trade, industry or governmental organizations apply to work in this Section

ASME Pressure Vessel Code.

National Electric Code.

Underwriters Laboratories Inc.

Comply with all applicable national, state and local codes and refer to Section GENERAL PROVISIONS FOR HEATING, VENTILATING AND AIR CONDITIONING WORK for additional Reference Standards

QUALITY ASSURANCE

Equipment, material and installation shall be in accordance with NEC, local codes and shall be UL listed or labeled

NOTE: IF ELECTRIC BOILERS ARE SPECIFIED.

Electric boilers shall be designed in accordance with ASME, State Boiler Code and authorities having jurisdiction

Refer to Section GENERAL PROVISIONS FOR HEATING, VENTILATING AND AIR CONDITIONING WORK for Guarantee and other Quality Assurance requirements

SUBMITTALS

Submit shop drawings, including catalog cuts, schedules and wiring diagrams, for the following

Boilers, including operating and maintenance manuals.

Heating coils.

Forced Flow heaters.

Direct radiation.

Unit heaters.

Part -	PRODUCTS

BASE BID MANUFACTURERS

Boilers - Electrode type: Cam Industries, Inc., Coates. Electric Products Div

Boilers - Resistance type: Edwin L. Wiegand Div. Emerson Electric Co. (Chromalox), Heat Timer Corp, National Steel Construction Co., Industrial Engineering and Equipment Co. (Indeeco), Precision Parts Corp and Brasch Manufacturing Co

Heating coils: Edwin L. Wiegand Div. Emerson Electric Co. (Chromalox), Electric Heaters, Inc,. Industrial Engineering and Equipment Co. (Indeeco), Brasch Manufacturing Co. and Singer Co., Climate Control Div

Unit heaters: Edwin L. Wiegand Div., Emerson Electric Co. (Chromalox), Berko Electric, (a Marley Company), Singer Co., Climate Control Div. and Brasch Manufacturing Co

Unit heater-cabinet type: Berko Electric, (a Marley Co.), Singer Co., Climate Control Div. and Emerson Environmental Products Div., Emerson Electric Co. (Chromalox)

Fin tube radiators: Berko Electric, (a Marley Co.), Singer Co., Climate Control Div. and Emerson Environmental Products Div., Emerson Electric Co. (Chromalox)

Cabinet convector: Emerson Environmental Products Div., Emerson Electric Co. (Chromalox), Climate Control Div., Singer Co. and Berko Electric, (a Marley Co.

NOTE: CONSIDER ELECTRODE TYPE BOILER ONLY FOR LOADS OVER 3000 KW. USABLE ONLY FOR WYE CONNECTED LOADS. REVIEW WITH ELECTRICAL DEPARTMENT BEFORE SPECIFYING

NOTE: EDIT AS REQUIRED.

STEAM BOILER - ELECTRODE TYPE

Package-type boiler shall be complete and ready for operation including steam generator, boiler feed water system, controls, minimum 18 guage sheet metal external casing and accessories. Boilers shall be factory assembled, prewired and tested, with power leads brought to single terminal location. Control and auxiliary power supplies shall be derived from this location

Steam generator shall be designed for working pressure of 125 psig and ASME stamped. Electrode surface area shall be of sufficient area to generate the minimum capacity. The level of water shall be maintained and conductivity shall be limited to 700 micromho-cm. The boiler shall be thermally insulated for a maximum 90 deg. F surface temperature. Terminals shall be copper. Rating shall be as follows

Evaporate ----- lbs. of water per hour with feed water temperature of 50 deg. F and boiler operating pressure of ----- psig. (----- KW)

NOTE: CHECK WITH EQUIPMENT MANUFACTURER WHETHER NEUTRAL AND GROUND WIRES ARE REQUIRED. NORMALLY WYE CONNECTED FEEDERS ARE REQUIRED. INFORM ELECTRICAL DEPARTMENT OF THESE REQUIREMENTS

Electrical supply: ----- volts, 3 phase, ----- wire, plus ground wire, 60 Hz

Boiler feed water system:

NOTE: IF STREET WATER PRESSURE IS LESS THAN 10 PSIG ABOVE BOILER OPERATING PRESSURE, A FEED WATER PUMP MUST BE PROVIDED. IT SHOULD NOT BE SPECIFIED AS PART OF BOILER PACKAGE

NOTE: CHECK IF FEED WATER CONDENSATE TANK, AS REQUIRED, IS FURNISHED AS PART OF BOILER ASSEMBLY. COORDINATE WITH MANUFACTURER

EED

Provide feed water tank.

Provide feed water and condensate tank and make-up water regulator

NOTE: USE AUTOMATIC BLOWDOWN WHEN A MINIMUM OF 90 PERCENT OF STEAM CONDENSATE IS RETURNED TO BOILER; OTHERWISE USE CONDUCTIVITY CONTROLLER

NOTE: INFORM ELECTRICAL DEPARTMENT TO WIRE UP AND GIVE THEM QUANTITIES

EED

Solid state controls for automatic and safe operation of boiler shall include modulating pressure control, load control, with load setting switch, emergency stop switch, starting relay, water level controller, contactors for local and remote alarm indications, low water cut-off pilot light and alarm with manual reset, high water cut-off pilot light and alarm with manual reset and high pressure limit cut-off pilot light and alarm with manual reset. Restart at zero load in the event of loss of power or interruption safety circuit. Control circuit shall be 120 volt, 1 phase, 60 Hz., with control transformer fused on secondary side and grounded

Accessories shall include load control solenoid valve, safety valves, blowdown valve and tank, automatic blowdown with motor driven ball valve and timer, conductivity controller and timer with motor driven ball valve, water gauge glass and test cocks, steam valve, steam pressure gauge with siphon, gauge cock and inspection cock, ammeter and pilot light for on-off switch. Boiler similar to Coates Model No. BAS or BAHS

STEAM BOILER - RESISTANCE TYPE

Packaged type boiler shall be complete and ready for operation including steam generator, boiler feed water system, controls, minimum 18 gauge steel sheet metal external casing and accessories. Boilers shall be factory assembled, pre-wired and tested with power leads brought to single terminal location. Control and auxiliary power supplies will be derived from this location

NOTE: 250 PSIG BOILER IS ALSO AVAILABLE.

Steam generator shall be designed for working pressure of 125 psig and ASME stamped. The immersion elements shall be the bolt on flanged type with stainless steel bolts. Overcurrent protection for each branch conductor. Nickel chrome coiled wire shall be imbedded in magnesium oxide refractory material and enclosed in incoloy sheath with minimum 0.03 inch. wall thickness. Maximum density for element diameter greater than 0.400 inch shall be 100 watts per square inch. Maximum density for element diameter less than 0.400 inch shall be 50 watts per square inch. Thermally insulate generator with fiberglass to achieve a maximum 90 deg. F surface temperature. Terminals shall be stainless steel or nickel plated steel. Rating shall be as follows

NOTE: CHECK WITH EQUIPMENT MANUFACTURER WHETHER NEUTRAL AND GROUND WIRES ARE REQIRED. INFORM ELECTRICAL DEPARTMENT OF THESE REQUIREMENTS

Electrical supply: ----- volt, 3 phase, 3 wire, plus ground wire, 60 Hz

Evaporate ----- lbs. of water per hour with feed water temperature of 50 deg F and boiler operating pressure of ----- psig. (------- KW)

NOTE: IF STREET WATER PRESSURE IS LESS THAN 10 PSIG ABOVE BOILER OPERATING PRESSURE, A FEED WATER PUMP MUST BE PROVIDED. IT SHOULD NOT BE SPECIFIED AS PART OF BOILER PACKAGE

NOTE: CHECK IF FEED WATER AND CONDENSATE TANK, AS REQUIRED, IS FURNISHED AS PART OF BOILER ASSEMBLY

EED

Boiler feed water system with condensate tank and make-up water regulator

Feedwater tank.

EED

Controls for completely automatic and safe operation of boiler shall be as follows

Pressure actuated step controller with ----- steps. Time interval between step actuation shall be minimum 9 seconds and maximum 18 seconds

Contactors with minimum rating 100,000 cycles and on-off switch, pre-wired to energize control circuit

NOTE: INFORM ELECTRICAL DEPARTMENT TO PROVIDE WIRING AND GIVE THEM QUANTITY

Starting relay to re-start at zero load, water level controller, contactors for local and remote alarm indications, low water cut-off with pilot light and alarm with manual reset, high water cut-off with pilot light and alarm with manual reset and high pressure limit cut-off with pilot light and alarm with manual reset. Cut-out all steps of load and restart at zero load in the event of loss of power or interruption of safety circuit. Control circuit shall be 120 volt, 1 phase, 60 Hz. with control transformer fused on secondary side and grounded

Accessories shall include ammeter, pressure gauge, temperature gauge, pilot ligert for on-off switch, safety valves and blow down valves and tank and as follows

NOTE: USE AUTOMATIC BLOWDOWN WHEN A MINIMUM OF 90 PERCENT OF STEAM CONDENSATE IS RETURNED TO BOILER; OTHERWISE USE CONDUCTIVITY CONTROLLER

LOW

Automatic blowdown with motor driven ball valve and timer

Conductivity controller and timer with motor driven ball valve

LOW

Water gauge glass and test cocks, steam valve, steam pressure gauge with siphon, gauge cock and inspection cock and pilot light for on-off switch

Boiler similar to Chromalox Model No. CHS or CHPES

NOTE: CONSIDER ELECTRODE TYPE BOILER ONLY FOR LOADS OVER 3,000 KW., USABLE ONLY FOR WYE CONNECTED LOADS. REVIEW WITH ELECTRICAL DEPARTMENT BEFORE SPECIFYING

HOT WATER BOILER - ELECTRODE TYPE

Boiler shall be package-type complete and ready for operation including hot water generator, controls, minimum 18 gauge steel sheet metal external casing and accessories. The boiler shall be factory assembled, pre-wired and tested with power leads brought to a single terminal location. Control and auxiliary power supplies will be derived from this location.

Hot water generator with design working pressure of 125 psig shall be ASME stamped. Electrode surface area shall be of sufficient area to generate the minimum capacity. The boiler shall be thermally insulated to a maximum 90 deg. F surface temperature. The level of water shall be maintained and conductivity shall be limited to maximum 700 micrombo-cm. Terminals shall be copper

NOTE: CHECK WITH EQUIPMENT MANUFACTURER WHETHER NEUTRAL AND GROUND WIRES ARE REQUIRED. INFORM ELECTRICAL DEPARTMENT OF THESE REQUIREMENTS

Electrical supply: ----- volt, 3 phase, ----- wire, plus ground wire, 60 Hz

Boiler shall be capable of heating ----- gpm of water from ----- deg F to ----- deg F. (------ KW)

NOTE: ADDITIONAL CONTACTOR IS REQUIRED TO CONTROL THE POWER OUTPUT FROM 0 TO 100%. STANDARD CONTACTORS MAINTAIN HOOD BETWEEN 5% TO 100% MAXIMUM. COORDINATE WITH THE MANUFACTURER

Controls for automatic and safe operation of boiler shall include temperature control, load control with load setting switch, contactors for local and remote alarm indication, high and low pressure limit cut-off, pilot light and alarm with manual reset, and temperature limit cut-off, pilot light and alarm with manual reset. Contactors with minimum rating of 100,000 cycles shall start and stop boiler when boiler load is below minimum required for shield control; provide start and stop sequence interlock circuit for operation of contactors

NOTE: INFORM ELECTRICAL DEPARTMENT TO PROVIDE WIRING AND GIVE THEM QUANTITIES

Restart at zero load in the event of loss of power or interruption of safety circuit. Control circuit shall be 120 volt, 1 phase, 60 Hz with control transformer fused on secondary side and grounded

Accessories shall include safety valve, blowdown valve, ammeter, pressure gauge, temperature gauge, shield position indicator and pilot light for on-off switch

Provide boiler similar to Coates Model No. BAW or BAHW.

HOT WATER BOILER - RESISTANCE TYPE

Boilers shall be package type complete and ready for operation including hot water generator, controls, accessories and minimum 18 gauge steel external casing. Boilers shall be factory assembled, pre-wired and tested with power leads brought to single terminal location. Control and auxiliary power supplies will be derived from this location

Hot water generator shall be designed for working pressure of 125 psig, and ASME stamped. The immersion elements shall be the bolt-on flanged type with stainless steel bolts with over current protection for each branch conductor. Nickel chrome coiled wire shall be imbedded in magnesium-oxide refractory material and enclosed in incoloy sheath with minimum 0.03 inch wall thickness. Maximum density for element diameter greater than 0.400 inch shall be 100 watts per square inch. Maximum density for element diameter less than 0.400 inch shall be 50 watts per square inch. Thermally insulate to a maximum 90 deg. F surface temperature. Terminals shall be stainless steel or nickel plated

NOTE: CHECK WITH EQUIPMENT MANUFACTURER WHETHER NEUTRAL AND GROUND WIRES ARE REQUIRED. INFORM ELECTRICAL DEPARTMENT OF THESE REQUIREMENTS

Electrical supply: ----- volt, 3 phase, 3 wire, plus ground wire, 60 Hz

Boiler shall be capable of heating ----- gpm of water from ----- deg F to ----- deg F. (----- kw)

Controls for automatic and safe operation of boiler shall be as follows

Step controller, temperature actuated, with ----- steps. Time interval between step actuation shall be minimum 90 seconds and maximum 18 seconds

Contactors with minimum rating of 100,000 cycles.

Prewired on-off switch to energize control circuit

NOTE: INFORM ELECTRICAL DEPARTMENT TO PROVIDE WIRING AND GIVE THEM QUANTITIES

Contactors for local and remote alarm indication.

Low water cut-off, pilot light and alarm with manual reset

High temperature cut-off, pilot light, and alarm with manual reset

Loss of power or interruption of safety circuit shall cut-out all steps of load and restart at zero load. Control circuit shall be 120 volt, 1 phase, 60 Hz with control transformer fused on secondary side and grounded

Accessories shall include safety valve, blowdown valve, pressure gauge, temperature gauge and pilot light for on-off switch

Provide boiler similar to Chromalox Model No. CEW or CHW

ELECTRIC RESISTANCE HEATING COILS

NOTE: CHECK WITH EQUIPMENT MANUFACTURER WHETHER NEUTRAL AND GROUND WIRES ARE REQUIRED. INFORM ELECTRICAL DEPARTMENT OF THESE REQUIREMENTS

NOTE: FOR HEATERS LOCATED ABOVE AREAS WITH LOW NOISE LEVEL RATINGS, USE MERCURY CONTACTORS OR REMOTE LOCATION OF STANDARD CONTACTORS. MERCURY CONTACTORS ARE EXPENSIVE

Electric resistance heating coils shall be of minimum capacities and number of stages as noted and in compliance with U.L. & NEC requirements. The coils shall be factory assembled, wired and tested and designed to eliminate 60 Hz hum. Electric supply shall be ----- volt, ----- phase, ----- wire, plus ground wire, 60 Hz. Threaded stud terminals, bolts, nuts and washers shall be stainless steel or monel. Contactors for 3 phase heaters, 1 phase heaters exceeding 15 amps, with rating 125 percent of heater current, 100,000 cycle service and mercury type where noted. Air flow across entire face of coil shall be uniform. Internal connections with bus bars shall be not less than 1/2 inch. wide or 1000 amps per sq. inch. Provide 221 deg F insulation and quick make, quick break, heavy duty type disconnect switch enclosed in control cabinet

Open element type heating elements shall be nickel chrome (80 percent nickel, 20 percent chrome) coiled wire. Open space between adjacent forms shall be minimum one wire diameter. Wire density shall not exceed 37 watts per square inch and wire surface temperature shall not exceed 1400 deg F

LIP

Slip-in frame with integral NEMA 1 terminal and splice box shall be heavy gauge steel construction with corrosion resistant coating

Slip-in frame with remote terminal and splice box shall be heavy gauge steel construction with corrosion resistant coating

NOTE: FOR AIR HANDLERS WITH ELECTRIC HEATING.

LIP

Coordinate frame configuration with packaged air handler manufacturer

NOTE: TERMINAL UNITS WITH ELECTRIC REHEAT.

For reheat coils on terminal units, coordinate size and configuration with terminal unit manufacturer

NOTE: WHERE REQUIRED, THE FOLLOWING ITEMS SHALL BE SUPPLIED IN CONTROL CABINET INTEGRAL WITH HEATER, OR REMOTELY LOCATED, DEPENDING ON HEATER SIZE, SPACE CONDITIONS AND TYPE OF CONTROLS: STAGING (STEP CONTROL) CONTACTORS, SCR'S SAFETY CONTACTORS, INDIVIDUAL CIRCUIT FUSING AND TRANSFORMER

NOTE: CHECK SPACE CONDITIONS CAREFULLY. INFORM ELECTRICAL DEPARTMENT WHETHER CONTROL CABINETS ARE INTEGRAL WITH HEATER OR REMOTELY LOCATED, AND WHETHER HEATERS HAVE STEP OR SCR CONTROL, OR BOTH

NOTE: INFORM ELECTRICAL DEPARTMENT TO PROVIDE THE FOLLOWING: 1. FOR HEATERS WITH INTEGRALLY MOUNTED CONTROL CABINETS: WIRE FROM LOCAL JUNCTION BOX TO CONTROL CABINET OF HEATER 2. FOR HEATERS WITH REMOTELY MOUNTED CONTROL CABINETS: INSTALL CONTROL CABINET. POWER WIRING TO CONTROL CABINET. POWER AND CONTROL WIRING FROM CONTROL CABINET TO HEATER. (INDICATE NUMBER OF CONTROL STEPS REQUIRED FOR MULTIPLE POWER LEADS BETWEEN CONTROL CABINET AND HEATER)

The following controls shall be furnished as part of unit:

Differential pressure air flow switch operable at minimum and maximum air flow, high-limit, automatic and manual reset thermal cutouts, staging contactors as part of unit, SCR's where specified under Section, "AUTOMATIC CONTROL SYSTEMS", safety contactors and overcurrent protection. Control circuit shall be 120 volt, 1 phase, 60 Hz, with control transformer fused on secondary side and grounded. Control cabinet shall also include staging and safety contactors, individual circuit fusing and control transformer, with terminal strips and required contacts

Provide heating coils similar to Indeeco Model No. QUA.

NOTE: FOR RECESSED WALL MOUNTED HEATERS.

FORCED FLOW HEATERS

Forced flow heaters with minimum capacities as noted and based on laboratory tests in accordance with IBR Code. Heaters shall be factory assembled, wired and tested and designed to eliminate 60 Hz hum and suitable for ----- volt, single phase, ----- wire plus ground wire, 60 Hz. Heating elements shall be nickel chrome (80 percent nickel, 20 percent chrome) coiled wire imbedded in magnesium-oxide refractory material and enclosed within sheath and spirally wound steel fins shall be furnace brazed to steel sheath. Finish on sheath and fins shall be heat resistant non-oxidizing finish on copper plating, high temperature ceramic coating or high temperature aluminum finish. Terminal end shall be fixed and other end shall be free to expand. Finish shall be maximum 6 fins per inch and surface temperature shall be maximum 550 deg F. Maximum air leaving temperature shall be 140 deg F. Motor with combination disconnect switch and controller shall be wired within unit to electric heating coil power supply, permanently sealed-in lubricating system and continuous duty sleeve bearings. Heaters similar to Chromalox Model AWH 4000 Series

NOTE: EDIT AS REQUIRED.

Unit heaters with propeller type fan, aluminum blades, zinc-plated steel spider and hub, factory balanced. Motor shall be enclosed, single speed, with guard. 18 gauge enclosure furniture quality steel shall be die-formed in sections, chemically treated to resist corrosion, with baked enamel finish and adjustable louvers and rubber isolation between motor - fan assembly and unit enclosure. Heating element shall be with steel sheath and fins. Controls furnished as part of unit shall include high limit thermal cut-out, automatic-reset type, wired to each heating element. Unit heaters similar to Chromalox Model LUH

Cabinet heaters shall be blow thru type, with direct driven double inlet foward curved centrifugal fans, two speed permanent split capacitor motor with overload protection, 16 gauge furniture quality steel internally insulated, inlet and outlet dicharge grilles, heating fins, throw-away type filters and as follows

NIT

Unit surface mounted.

Unit recessed.

Ceiling mounted.

NIT

Electrical thermostat with capillary tube as follows:

HERM

Remotely mounted by contractor.

Integrally mounted in cabinet.

HERM

Overheat cut out.

Bulb and capillary type thermostat shall sense temperature along entire length of heating elements. Adjustment range shall be 46 deg to 75 deg F. Thermostat shall be factory installed in enclosure terminal box and factory wired to heating element

Manual 2-speed switch, fan delay switch and high limit thermal cut-out, automatic reset type, wired to each heating element

Cabinet heater similar to Chromalox Model CU.

DIRECT RADIATION

NOTE: REVIEW WITH ELECTRICAL DEPARTMENT.

Direct radiation with minimum capacities as noted on laboratory tests in accordance with IBR Code. Unit shall be factory assembled, wired and tested, designed to eliminate 60 Hz hum with automatic reset type high limit thermal cut-out. Disconnect switch, and thermostat, wire plus ground wire, 60 Hz. Heating element shall be nickel chrome (80 percent nickel, 20 percent chrome) coiled wire imbedded in magnesium-oxide refractory material enclosed within steel sheath and aluminum fins with heat resistant non-oxidizing finish on sheath and fins. Terminal end shall be fixed; other end shall be free to expand. Maximum surface temperature shall be 750 deg F and maximum fins shall be 6 fins per inch

Enclosure 16 gauge, furniture quality steel, reinforced, all welded construction, chemically treated to resist corrosion, baked enamel finish with color as selected by Architect, and steel discharge louver. Bottom air inlet shall have small perforated openings and back panel shall be slotted along top and bottom for attachment to wall without removal of heating assembly. End caps for free standing installation, corner and filler pieces for continuous wall to wall installation and hinged access door to thermostat.

NOTE: REVIEW ABOVE MOUNTING WITH ARCHITECT.

Electric thermostat furnished as part of unit: provide capillary tube and bulb, adjustment range 50-100 deg F , manually set NO-HEAT position

NSTAL

Thermostat shall be factory installed in enclosure terminal box and factory wired to heating element

Thermostat shall be remotely mounted by Contractor

Pedestal mounted radiators shall be similar to Chromalox Model CSH or CPH

NSTAL

Cabinet convectors: 16 gauge, furniture quality steel enclosure, chemically treated to resist corrosion, with baked enamel finish, color as selected by Architect and inlet and outlet grilles.

NST

Surface mounted unit.

Recessed unit.

NST

Electric thermostat shall be furnished as part of unit shall have adjustment range between 50-100 deg F with manually set NO-HEAT position

INST

Factory installed in enclosure terminal box and factory wired to heating element

Remotely mounted by Contractor

INST

Unit shall be similar to Chromalox Model No. KSF or KFR.

Part -	EXECUTION

INSTALLATION

Coordinate with electrical work.

Electrical work is based on electrical equipment and wiring required for equipment of one base bid manufacturer. Provide any additional electrical equipment or wiring which may be required for equipment of any other base bid manufacturer

Wiring shall be in conduit and in strict conformance with specifications for Electrical Work

Install boilers in accordance with manufacturer's recommendations. Provide services of factory trained representatives for minimum of three (3) days to supervise initial start-up and instruct owner in operation

NOTE: INFORM ELECTRICAL DEPARTMENT OF REMOTE LOCATION OF CONTROL CABINETS

Install heating coils in accordance with manufacturer's recommendations. Provide mimimum of 48 inches between heater and duct elbow, transition or other piece of equipment. Install terminal box on side of duct where possible; otherwise, install on top or bottom according to accessibility. Install control cabinets remotely where indicated

Install unit heaters on hanger rods or wall brackets as required. Where overhead construction does not permit fastening of rods, provide additional framing

Provide recessed, semi-recessed and/or free standing cabinet type unit heaters as noted or indicated

Mount finned tube radiation in accordance with manufacturer's recommendations. Bottom of unit shall be a minimum of 3 inches above finished floor or as indicated on drawings

Install recessed, semi-recessed and/or free standing cabinet convectors, as noted or indicated