ISSB-1 SERVICE MANUAL COMPLETE
Contents
1. q3HSINHA4 L3USVO G3HSINYNH S31OH G3TTIHA I3Yd Q3HSINHA4 LON i 1108 9v1 JWVH4 3Sv8 LINN ATENSISSV 9 dO YILINIYId JYILNI NO GITIVISNI 39 OL LIMSVD YIENINSSOYD G4ND 4004 6626 8465 HONOUHL 262 865 TVOIdA L 31 NGS E HVAC EEE P O Box 669 Hastings Nebraska 68902 0669 Phone 402 463 9821 Fax 402 462 8006 www hastingshvac com E mail sales hastingshvac com2. NOILOAS HdNuna ee NOILOAS SLNIOd NOISNHdSNS ANY SONT WHO4LV Id JOIAYIS ONIONTONI LINN G93AN3dSNS YOOONI 072 846 22 95 WOldAL 19 HIUNLOVANNVIN LINN AG GSHSINYNA LON SGOU NOISNIASNS SNOILdO GT1O4INVIN HLIM TIM SLNIOd NOISNAdSNS ALON NOILOAS HYIMO1A S ON 38NDI NOILOAS 831714 NOILOAS HINUNA SINIOd NOISNAdSNS ANY 59171 ONILANM ONIGMTONI 1AaNASSV LINN 812 95 ELL 4S WOIdAL 20 HAHN LOVAANVA LINN GAHSINYNA LON SQO4 NOISNAdSNS SNOLLdO GT1O4INVIN AHVA TIIM SLNIOd NOISNIASNS ALON NOILOAS 9 ON 44NDI4 NOILOAS YHINYNE SY NOILOAS 431714 SLNIOd NOISNAdSNS ANY SONT ONIGN TON ATANSSSV LINN 072 95 5 IWOIdAL 21 TYPICAL DUCT CONNECTION INDOOR UNITS Anchor To Wall Birdscreen Fresh Air Duct to unit intake Duct Liner Fresh Air Duct FIGURE NO 7 22 INTAKE HOOD AND BIRDSCREEN Air Flow NG ER NN ARR III AN AW AN 41 FIGURE NO 8 1 ES 23 G SUMMER D gt WINTER BLOWER SEASON FIGURE NO 9 TVPICAL REMOTE CONTROL PANEL REMOTE CONTROL PANEL D
3. Fi Uure 4 u uum 19 Unit Assembly and Suspension Figure 5 20 Unit Assembly and Suspension Figure 6 nana nrnnnnnnnna nana a 21 Duct Gonnections Figure ira ve 22 Intake Hood Figure J Mage 23 Remote Control Panel Figure SL ices a 24 Remote Control Panel Installation Figure 10 a 25 Vertical Unit Figure 11 seus a Adare ee A A et 26 Vertical Unit Base Frame Figure 12 isu sukai 27 Vertical Unit Base Frame Figure 13 L iii 28 Valve Adjustments a a eed 29 Roof Curbs Figure onto RE IE ina 30 Roof Gurbs iaia asili 31 SECTION 1 General Information A INSTALLATION AND SERVICE INSTRUCTIONS Installation and service manuals are made up for each individual order The purpose of the following instruction is to present guide for proper installation and operation of said equipment and to act as supplement to the services of qualified field service engineer at initial start up of Hastings piece of equipment We recommend that this manual be readily available to operating personnel for refer ence as an aid for troubl
4. Disconnect wire from amplifier terminal 2 8 this causes valve to go to continuous low fire Remove cap B and loosen lock screw C Turn D to desired low fire adjustment Clockwise rotation reduces minimum flow rate Tighten set screw C replace cap B and reconnect wire to amplifier terminal 8 29 continuous low fire Remove cap A and turn adjusting screw B to desired low fire adjustment Clockwise rotation reduces minimum flow rate Replace cap A and reconnect wire to amplifier terminal 8 vl ON 38N 913 YSTIVLSNI SONILSVH CISVHOYUNd SI SYND 01314 NI GA1GWASSv 38 OL SENO dI SONILSVH Ag Q3HSINHN4 LIUSVO 3LON NOLLOAHLSNOO Q3HSINHA4 LON dIHLS LNYO G3HSINYNH LON 1734 PNI4HOOH G3HSINYNH LON PT NOLLVINSNI dio 7 43HSINHN4 gyno ATAWASSV 8419 40 Garner H313WIH3d 3HILN3 NO CATIVISNI 38 OL LIMSVD HITIYN GOOM G3HSINHA4 LIASVO 5 88N9 40084 812 95 11 95 TVOIdA L 30 SONILSVH GSSVHOUNd SI guno St ON 38ND 4 dl SONILSVH Ad GSHSINYNA LIMSVD G3HSINYNH LON dIHLS INVO YSTIVLSNI 01313 NI CITANISSV 38 OL gano ALON NOILONYLSNOD G3HSINYNH LON 1734 PNI4OO4 Q3HSINHA4 LON NOILVINSNI CIDIY G3HSINYNH LON ONIHSVI4 q3HSINHN4 TVN GOOM
5. Steam or hot water valves linkage and valve motors are shipped for field mounting and wiring Control System The standard control system permits the unit to operate for make up air heating or heating and ventilating purposes or run the blower s only for summer ventilation Refer to the detailed sequence of operation in cluded with this manual for exact unit operation SECTION 2 E INSTALLATION PROCEDURE The following recommendations are not intended to supplant any requirements of federal state or local codes having jurisdiction This equipment shall be installed and wired in accordance with regulations of the National board of Fire Underwriters National Electric Code and local governing bodies In Canada equipment should be installed in accordance with the applicable provincial regulations 1 Handling the Equipment The SB unit has been designed for rigging and handling through the units channel base frame and or special lifting lug hooks installed on the unit All lifting operations must be accomplished with a load spreader of suf ficient width to insure that the lifting cables clear the side of the unit If this type of spreader is not available wood strips should be inserted between the cables and unit where necessary See Figure No 1 and No 2 in this manual Units are suspended from same lifting lugs as used for handling See Figure No 3 and Figure No 4 To be properly set the SB unit should be placed on a solid flat
6. Figure No 7 Insert insulated fresh air collar through the opening with flanges turned out to provide rigidity Anchor intake hood with birdscreen to outside of wall see dimensions for intake hoods on Figure No 8 Caulk perimeter of opening to make connection water tight Units with a vertical upblast discharge arrangement must have discharge ductwork supported from building support members and not supported from the equipment NO DISCHARGE DUCTWORK IS TO BE SUPPORTED BY EQUIPMENT DISCHARGE OPENING CONNECTIONS NOTE On indoor units intake hood and birdscreen and any appropriate ductwork must be full size of unit opening see Figure No 8 b Outdoor Units See Figures No 1 and No 2 1 Fasten intake hood and birdscreen directly to unit inlet Caulk perimeter of opening to make con nection watertight 2 Units with a vertical upblast discharge arrangement must have discharge ductwork supported from building support members and not supported from the equipment NO DISCHARGE DUCTWORK IS TO BE SUPPORTED BY EQUIPMENT DISCHARGE OPENING CONNECTIONS Connect discharge air duct or discharge grill to unit outlet If unit is installed outdoors be sure that duct opening to building is adequately flashed and sealed to prevent leakage All air to the heater must be ducted directly from the outdoors Recirculation of room air is not permitted Adequate instructions shall be provided to address heater installations where a duct work
7. heater a state ment that the heater be installed such that the gas ignition control system is not directly exposed to water spray rain or dripping water Identification of the entry location s for field installed wiring and control wiring Adequate instructions shall be provided for field wiring of equipment if applicable Information that an elec tric disconnect switch having adequate ampacity see marking on the heater for voltage and ampacity if not provided as part of the heater shall be installed in accordance with Article 430 of the National Electrial Code ANSINFPA 70 5 Piping Connections a All gas piping connections are not shown in this manual because of the many manifold arrangements available due to approval codes and types of gas modulation All gas piping must comply with Standard of National Board of Fire Underwriters and all applicable local codes Contact factory if exact gas piping dimensions are required Standard pipe caps are furnished on manifold for shipment from factory Run correctly sized gas line to unit Install manual shut off valve and regulator if not already installed Note gas line pressure must be as shown on specification plate when unit is operating at full input Vent pressure regulator s and vent valve if included with unit to outside of building With vent pipe out side install a proper vent cap and or screen to prevent entrance of foreign material and plugging The heater and its individual shut
8. in the field Start Up Service This service includes the presence of a service engineer to perform the initial start up and adjust ment of the equipment instruction of the owner s maintenance personnel in proper operation and maintenance and return calls for any adjustments required to particular unit within period of ninety 90 days after start up is complete Customer s loss of power or fuel will not constitute need for any return calls ROS Factory Operations Test All SB air handling heating ventilating and make up air units are given complete operations test and con trol circuit check out before final shipment copy of the flame test report and bill of material with testers certifications stamp is included with each unit shipped Inspection of Shipment Upon Arrival Shipments are made Hastings Nebraska by truck The unit is securely strapped tied and blocked to prevent shipping damage All shipments are checked by an inspector before they are accepted by the carrier Parts that are shipped unmounted are noted on the bill of materials These parts where feasible are packaged and shipped with the units Upon receipt of shipment all units should be checked against the bill of lading to insure all items have been received The units should be checked carefully for physical damage in the presence of the carriers representative If parts are missing or damage has oc curred a claim should be filed immediately wi
9. EPTH 3 1 2 LID IS 16 GAGE BRUSHED STAINLESS STEEL ALL LETTERS ARE SILKSCREENED BLACK NOTE FILTER LIGHT MAY NOT BE REQUIRED ON ALL APPLICATIONS 24 TYPICAL REMOTE CONTROL PANEL INSTALLATION Wall Stud or Support Installer to provide mounting iri holes amp conduit W hole s as field conditions require Typical installation in Web of Bldg Col Conduit or Flex not by unit manufacturer to main control panel Cut in wall 221 Control Panel Wiring Box Wall Plate Use only when Wiring Box is to be recess 0 Wall Plate optional Supplied on Request FIGURE NO 10 25 TYPICAL VERTICAL UNIT INSTALLATION INCLUDING B WEATHERPROOF CONSTRUCTION SB 222 THROUGH SB 240 SHOWN BLOWER SECTION TOP MOUNTING CHANNEL BASE CHANNEL FRAME 112 240 222 240 OR MOUNTING CHANNELS 112 218 Le BURNER SECTION SPLICE PLATES PROVIDED FOR FIELD ASSEMBLY FILTER SECTION BIRDSCREEN 20 MIN 42 MIN 240 FIGURE 11 BASE ASSEMBLY cl ON 38NDIH ATANISSY HINHYOO TVIIdAL vx LAN LL 8 9 1108 GV4H g l L LL 8 S HAHSVMMOOT 8 6 x o l ATENSSSV PNILIOA4 INVHA LINN IVOILUFA 812 95 GI 1 8S TVOIdA L 27 ATENSSSV dd3NdOO WOIldAL
10. HAHSVMMOOT 8 6 11098 GV4H X4H 2 1 1 LL 8 G EL ON 38NDIH ATANISSV ONILTOA 3INVdd LINN TYOILYIN 0 95 222 95 WOldAL 28 Valve Adjustments For 1014 Amplifier See bulletin MT2035 for additional M MR valve information NOTE Low fire adjustment should be checked whenever the high fire adjustment is changed MR 212 Valve M411 511 611 VALVE High Fire Manifold Adjustments 1 Disconnect wires from amplifier terminal 4 This causes the valve to call for continuous high fire 2 Remove seal cal a and turn regulator pressure adjusting screw to obtain desired mainfold pressure Clockwise rotation Reconnect the wires increases pressure to amplifier terminal 3 Reconnect hte wires to amplifier 2 kl LA 4 terminal 4 NOTE If low fire bypass is on maximum the desired high fire outlet pressure may not be achieved High Fire Manifold Adjustments Disconnect wires from amplifier terminal 4 this causes the valve to call for continuous high fire Adjust the pressure regulator to obtain the desired manifold pressure 7 w c maximum 1 Disconnect wire from amplifier terminal 8 this causes the valve to call for continuous low fire Remove cap A and turn adjusting screw B to desired low fire adjustment Clockwise rotation reduces minimum flow rate Replace cap A and reconnect wire to amplifier termi
11. ISSB 1 July 2007 mA HVAC Installation and Service Instructions DIRECT FIRED ELECTRIC STEAM AND HOT WATER SB 112 through SB 240 NOTICE Read These Instructions before installation Location Installer Phone No Date Installed FOR YOUR SAFETY If you smell gas Open windows 2 Don t touch electrical switches 3 Extinguish any open flame 4 Immediately call your gas supplier WARNING Improper installation adjustment alteration service or maintenance an cause property damage injury or death Read the installation operating and maintenance instructions thoroughly be fore installing or servicing this equipment FOR YOUR SAFETY The use and storage of gasoline or other flammable vapors and liq uids in open containers in the vicinity of this appliance is hazardous ADDENDUM NOTE A low temperature limit control is recommended in areas where freeze up protection is needed in the event of burner shutdown NOTE Install heater such that the ignition system is not directly exposed to water spray rain or dripping water NOTE If not supplied by the factory provide an electric switch having adequate ampacity see specifi cation plate on heater for voltage and ampacity and shall be installed in accordance with Article 430 of the National Electrical Code ANSI NFPA 70 NOTE Refer to markings on heater control box for loca
12. air check to see if a Modulating valve is functioning properly b All gas cocks are in full open position Inlet pressure to unit agrees with unit specification plate d Gas pressure at burner is 4 1 2 W C If not adjust main gas pressure regulators on unit until there is 4 1 2 W C at burner If unit is designed for reduced manifold pressure correct pressure to agree with that shown on unit specification plate If burner ignites but modulating valve fails to open check to see if a Temperature selector dial is set at proper temperature range b Motor and controller are wired properly Setting of discharge temperature selector dial or modulating room thermostat If unit is equipped with motorized pre mix burner and burner does not operate check to see if a Burner relay or starter coil energized b Burner starter if required needs resetting c Differential burner proving switch closing blower must run for switch to close L TROUBLE SHOOTING THE ELECTRIC SB UNIT If blower fails to operate check to see if a Optional main disconnect switch or circuit breaker closed b All main fuses if disconnect switch used are in line c Control transformer is supplying 115 volts to control circuit d Blower switch in remote control panel is on if unit used for make up air or in the on or auto position if unit is being used for space heating or heating ventilating NOTE If blower switc
13. and level foundation and set exactly as de tailed later in the installation guide During the transit unloading and setting of the unit bolts and nuts may have become loosened particularly in the pillow block ball bearing assemblies on blower section It is recommended that all nuts and set screws be tightened Turn blower fan shaft by hand to make certain that no rubbing occurs and to check that bear ing lock rings are tight Open the cover on the electrical control box located at the top on the side of the burner blower section if air handling unit only section Box can be opened by turning main fused disconnect switch to the off position disconnect is optional on air handling equipment Inspect all wire terminals and wiring terminations to en sure connections are tight If unit is supplied with an electric heating section check the separate electrical terminal box for any loose connections Locating the Unit Prior to locating the unit authorities having jurisdiction should be consulted before installations are made Approval permits should be checked against the unit received Locate the SB unit exactly level making certain there is enough clearance for opening and removing access doors Special attention should be given to supply if required and discharge duct connections Electrical power and control hook up points and steam or hot water supply and return lines if required should also be noted This information should be cro
14. crew type All terminals are numbered according to corresponding wiring diagram Wiring All wiring is 16 AWG 16 30 standard 105 C thermoplastic or equivalent Wiring is color coded per corresponding wiring diagram Remote Control Panel Installation a Refer to Figure No 10 Align box with spirit level If box is to be surface mounted three 3 mounting holes in back of box are recommended One in each top corner and one at bottom center d mounting holes are to be located in side of box as shown four 4 holes are recommended Two at top and two at bottom e If wiring box is to be recessed install so that open edge of box will be flush with finish wall Install optional flush mounting wall plate f Examine wiring box and control panel for clearance before providing conduit hole s wiring must comply with applicable electric codes h Control panel is furnished with components wired to coded terminal strip Installer to connect num bered terminal blocks on remote control panel to corresponding terminal block s in master control panel on unit i The following table should be followed for proper low voltage wiring of remote control panel based on a maximum voltage drop of two 2 volts Wire Size Maximum Wire Length in Feet Mii 160 MA EE 245 A hen AR koia 395 j See Wiring diagram level referencing shielded cable for remote temperature dial connection 10 Miscellaneous Installation Guideline
15. cure and drive belts are tight 12 Check filters for cleanliness and in the case of throw away filters make certain that they are free of moisture Note Wet filters will collapse under static pressure and the media will be sucked into the downstream sections of the unit 13 If any optional dampers are supplied make certain that all dampers linkage is free to move and that no binding will occur If dampers are of the modulating type check control capillary tubes to insure that the tubes will not rub against any stationary objects 14 Check all areas for cleanliness 15 Secure all access doors 16 Check all canvas connectors where used between the unit and any duct work used 17 Instructions specifying that service personnel shall perform a gas leak check during heater start up to verify the gas tightness of the heater s components and piping under normal operating conditions 18 Adequate instructions shall be provided for adjusting the pilot flame 19 Adequate instructions shall be provided for checking the gas tightness of the safety shut off valve s G START UP All safety and operating controls have been checked during the factory test period however it is advisable to complete a similar check when first operating the unit 1 Remove shipping blocks from gas units only a High limit switch if mercury bulb type mounted on burner cabinet Remove limit switch cover re move paper blocking and tilt mercu
16. d Blower switch in remote control panel is e High limit control is in circuit manual reset switch f Magnetic motor starter is in circuit manual reset starter g There are any loose wires or connections in blower circuit at either terminal block or control com ponents Also check the following optional controls if used to see if a Main gas cock is open units equipped with manual reset low gas pressure switch must have gas at switch for proper switch operation b Low gas pressure switch in circuit manual reset switch c High gas pressure switch in circuit manual reset switch d Damper motor end switch is closed damper motor must be full open e Low limit temperature control setting too high or n c over riding timer contacts open f Access door switch es open NOTE If other optional controls are supplied on special applications check to see if they are in the electrical circuit If blower runs but remote control panel blower light doesn t come on air proving switch is faulty dis charge is blocked belt s loose and slipping or blower is running backwards Also check to see if air proving switch sensing tube is plugged or has been crimped Also check to see if RPM and CFM re quired match specification plate on unit a lf a pre purge timer separate from programming relay is used blower light won t come on until unit has purged b Blower light in remote panel will not function until al
17. dulating step controller has power check to see if 1 Step controller power transformer fuses in electrical circuit 2 Power transformer supplying 115 volts 3 Automatic reset thermal cutout is closed Step controller is functioning Any or all sub circuiting heating element fuses in circuit Magnetic heating element contractor coils are energized and contacts are closed Thermally operated heat limiters are in power legs to heating elements If unit does not heat air check to see if Modulating step controller is operating through all heating steps Sub circuit heating element fuses in circuit All magnetic heating element contactors are operational Heat limiters are n c and in the electrical circuit NOTE Electric heating SBE units may not be furnished with a disconnect switch or circuit breaker If any service work is to be required opening more than one disconnect switch may be required to com pletely de energize system Make no attempt to re wire any heating element circuits if a failure oc curs Contact home office M TROUBLE SHOOTING THE STEAM OR HOT WATER SB UNIT 1 b f If blower fails to operate check to see if Main disconnect switch or circuit breaker closed All main fuses if disconnect switch used are in line Control transformer is supplving 115 volts to control circuits Season switch in remote control panel in summer position or if in winter position
18. e diagnosis and proper maintenance Information for installation of the heater 1 in airplane hangars in accordance with the Standard for Aircraft Hangers ANSI NFPA 409 and 2 public garages in accordance with the standard for Park ing Structures ANSI NFPA 88A or the Standard for Repair Garages ANSI NFPA 88B and with CAN CGA B149 Installation Codes The installation shall conform with local codes or in the absence of local codes in accordance with the National Fuel Gas Code ANSI Z223 1 or the CAN CGA B149 Installation Codes Instructions requiring that if the failure or malfunction of this heater creates hazard to other fuel burning equipment in the building e g when the heater is providing the make up air to boiler room the unit is to be interlocked to open inlet air dampers or other such devices Authorities having jurisdiction should be consulted before installations are made Local codes may require additional safety controls and or interlocks B IMPORTANT NOTICE TO EQUIPMENT USERS Models SBD 112 through SBD 218 are shipped with burner section and blower section assembled Intake hood and birdscreen filter section intake or discharge damper sections or other large acces sories are assembled but shipped as individual items Models SBD 222 through SBD 240 are shipped as separate sections SBE SBDR SBS SBW and vertical units are shipped in the same manner as explained above All options and accessories are
19. east twice yearly Blower motor has sealed bearings thus eliminating the need for periodic oiling Motor bearings vary with size and type of application Refer to motor instructions for proper maintenance schedule Belts must be tightened as explained previously if so required Check pulleys for proper alignment J INSTALLATION OF ROOF CURBS The SB unit can be supplied with an optional roof curb The curb greatly facilitates installation thereby reducing installation costs All connections to the unit ductwork piping and electrical power and control wiring can be made through the roof opening The curb may be shipped prior to unit shipment or may accompany the SB unit to the jobsite All SB curbs are shipped knocked down from factory The curb is 3 1 2 thick and includes a 2 high wood nailer strip curb adaptor and sealing tape Curb is made from 18 gauge galvanized steel and painted Curb does not include insulation or can t strip may be required to adapt to all types of roofing including gyp sum See Figure No 21 and Figure No 22 Use extreme caution in handling the curb Proper handling and positioning will insure a water tight curb unit installation Re check approval prints prior to installation Be sure that there are no obstructions to ducting and that proper planning has been exercised in connection of piping and or electrical services The curb assembly must be supported by roof trusses at intervals no greater than eigh
20. equipment should not attempt the initial adjustment and check out procedure essen tial before such installations may be considered as ready for operation F PRE START INSPECTION D M B N This inspection is extremely important and should be completed with greatest care given to detail good pre start inspection will insure against possible unit damage on start up and will save valuable analysis time in the event malfunctions occur on start up and check out Check to see that all factory installed pipe plugs have been removed Again check supply voltage against unit voltage If an electric heating section is supplied check supply voltage against element voltage Check all electrical connections in the main control panel and remote control panel Check that all fuses are installed and that fuse sizing agrees with the unit bill of material If optional steam hot water or chilled water coils are supplied check to see that all piping connections are secure and that face areas of coil s have not been damaged or blocked Check to see if all gas connections are tight and that all joints have been properly lubricated Check to see if all condensate drain piping has been completed if required Insure that all insulation is fastened securely to walls ceiling and floor areas 7 10 Check blower supply area to insure freedom of shaft rotation and proper belt tension 11 Check blower motor to insure that pulleys are se
21. h is auto position blower will operate for approximately 90 seconds after switch is turned off e Blower start relay coil energized and contact closed mh Fan delay timer heating element energized and contacts closed g Magnetic motor starter is in circuit manual reset starter h There are any loose wires or connections in blower circuit at either terminal block or control components Also check the following optional controls if used to see if a Damper motor and end switch is closed damper motor must be full open b Low limit temperature control setting too high or n c over riding timer contacts open c Access door switch es open NOTE If other optional controls are supplied on special applications check to see if they are in the electrical cir cuit 2 If blower runs but remote control panel blower light doesn t come on auxiliary starter contact in magnetic motor starter not closing Units equipped with filter sections will have a clogged filter or blocked intake light in remote control panel If blower operates but electric heater fails to operate check to see if a Season switch in remote control panel is in winter position 13 Air proving switch is closed check to see if 1 Discharge is blocked 2 Belt s are loose and slipping 3 Blower is running backwards 4 Sensing tube is blocked or crimped Heating relay coil is energized and contacts closed Standard mo
22. ing switch AP and auxiliary starter contacts IMI are closed power is supplied to burner protectorelay PR If entering air temperature is below the setting of the entering air temperature controller AT protectorelay powers ignition transformer GN and pilot valve PV opens When pilot is lit flame rod FR detects pilot flame and ignition transformer drops out of electrical circuit Main gas solenoid valve MV opens and pilot lights main burner The alarm safety switch lockout terminals AS will close if detection of flame or flame simulating conditions occur if there is a failure to ignite or main flame or on a loss of flame while burner is running The alarm lockout terminals will energize the safety lockout relay 2R which will open the lockout relay contacts 2R1 and shut down the blower and burner Safety lockout light R in remote control panel will be operational Burner flame is controlled by the modulating valve MR and discharge air controller TD Flame is increased and decreased as discharge temperature rises and falls above and below setpoint of dis charge air controller Typical sequence of operation electric units see attached wiring schematic EHV ACD2T Figure No 20 Closing optional main disconnect switch FD supplies 115 volt power to control circuit through 115 volt control transformer T2 Unit is ready for operation Summer Operation If three position season switch SW is in the summer pos
23. itch to on position White signal light marked blower should indicate that the blower is operating If blower runs but light does not come on blower may be running in reverse direction All applicable safety controls are in series with blower motor starter coil and must be in the electrical circuit for proper unit operation see appropriate electrical wiring schematic All three phase motors were properly phased during factory testing If rotation is reversed interrupt main power supply and interchange any two of the incoming power leads Re establish power and re check blower operation On three phase unit the starter contacts should pull in and hold quietly without clatter relays serve as starters on single phase units If they do not operate quietly check immediately for proper line voltage Even temporary low voltage at start up will cause constant operating trouble and must be corrected be fore SB unit is placed in service 8 10 11 12 Re check all set screws on motor sheave blower sheave and blower wheel s Check alignment of belts and pulleys Run blower for few minutes and adjust motor take up if necessary see Figure No 14 Do not over tighten belts since excessive tension will reduce belt life and cause excessive load on bearings After initial start has been made give the belts few days running time to become seated in pulley grooves re adjust take up bolt s as necessary Run drive a
24. ition and the three position blower switch BL is in the on position power is supplied to the blower motor starter IM Blower relay 6R and blower delay timer DT must be operational Blower motor will run if blower motor overloads OL s are not tripped Heater is inoperative System white light W in remote control panel will be on if auxiliary blower motor starter contacts IMI are closed Optional clogged filter light B in remote control panel will be operational if a blocked intake or clogged filter situation occurs Winter Operation If three position season switch is in the winter position heating control relay 7R is operational and air flow through unit has been proven by blower air proving switch AP the electronic sequencer SE will modulate for desired heat if power is supplied to sequencer through sequencer control transformer T2 and automatic reset thermal cutout AR Heating is controlled by the modulating sequencer through the action of the over riding modulating room thermostat MB If the discharge temperature of the unit falls below the setting of the modulating discharge air controller MD the over riding room thermostat is over ridden and heating output is increased until the modulating discharge air controller is satisfied If the discharge temperature of the unit rises above the setting of the modulating high limit control MC the over riding room thermostat is over ridden and heating out
25. l air proving safety controls are operational Units equipped with filter sections will have a clogged filter or blocked intake light in remote control panel If filter light is on and blower light is off check for a Dirty filters b Blocked intake If blower starts and remote control panel blower light comes on operates for a short time and then stops check a Starter reset and possible motor overloading b To see if unit equipped with low outlet temperature shut off with cold start time delay 1 Low limit control setpoint too high 2 Over riding timer completing its cycle before burner operates 3 Burner fails to operate If blower operates and blower signal light is on but burner fails to operate check to see if a Season switch in remote control panel is in winter position b Auxiliary starter contact in magnetic motor starter closed c Programming relay in safety lockout e Intake air temperature controller set point above outdoor ambient temperature e Ignition transformer functioning properly f Spark gap is approximately 3 8 g Flame rod wire and spark ignition wire for loose connections and or reversed wires h Any electrode insulators are cracked replace as required i Pilot gas valve is open and that pilot has been lit purge pilot gas line to eliminate any air 12 j three to four micro amp reading fof pilot is being attained k Main gas valve s open If unit does not heat
26. m terminal 8 in the amplifier see Figure No 15 This causes the valve to call for continuous low fire 2 Remove seal cap B and loosen lock screw C Turn D to desired low fire adjustment Clockwise rotation reduces minimum flow rate See Figure No 17 3 Tighten set screw C replace cap B and reconnect wire to terminal 8 c MR611 valve high fire manifold adjustment 1 Disconnect wires from terminal 4 in the amplifier see figure 15 This causes the valve to call for continuous high fire 2 Adjust the pressure regulator to obtain the desired manifold pressure 7 WC Max 3 Reconnect the wires to terminal 4 d MR611 valve low fire or by pass adjustment 1 Disconnect wire from terminal 8 the amplifier see figure No 15 This causes the valve to call for continuous high fire 2 Remove cap A and turn adjusting screw B to desired low fire adjustment see Figure No 18 3 Replace cap A and reconnect wire to terminal 8 NOTE If calibration of the amplifier or remote temperature selector is necessary place an accurate temperature measuring device as near the discharge air sensor as possible Set the remote tem perature at least 10 F above the outside air temperature 1 If calibrating at the amplifier adjust calibration potentiometer A Figure No 15 until tem perature reads the same as the set temperature If the temperature is below the set point then rotate calibration p
27. n mains Most of the common causes of trouble have been covered and one of more remedies suggested to correct the malfunction but if SB unit still fails to operate properly notify the nearest Hastings service representative 15 BLOWER SECTION TYPICAL SB 112 THROUGH SB 218 UNIT ASSEMBLY INCLUDING WEATHERPROOF CONSTRUCTION LIFTING LUGS LINE BURNER BURNER SECTION WEATHERPROOF ENCLOSURE AM 4 CONTROL INTAKE HOOD AND BIRDSCREEN FIGURE NO 1 ON 34NDIH VIVO IVNOLLIGGV 94 OL NOILOAS FDVd 338 SNOILOAS 3719 9557 OL GAYINDAY STANNVHO 321146 GATIVLSNI 07313 NI9HOSCUIA GOOH IMVINI AOOYdYAHLVAM 47 NOILOAS HINUNA NOILOAS 7 HINYNE INIT NOILONHYLSNO9 JOOHAHAHLVAM SON ONILAN ONIGN TON ATANISSYV LINN 072 95 5 WOIdAL ON SNOILdO ANY GIOJINVAI HLIM AHVA TIIM SLNIOd NOISNAdSNS WYOHLV Id FIIAHIS NOILOAS NOILOAS YHINYNE NOILOAS 431713 SLNIOd NOISNIdSNS SONT ONILSN WHO4LV Id JOIAYHIS ONIONTONI LINN 5 5 HOOQNI 812 95 211 95 WOIdAL 18 ON SYNDIA HAHN LOVAHANVA LINN AG GAHSINHA4 LON SQO4 NOISNIASNS SNOLLdO TOHLNOQ GIOJINVAI HLIM AHVA SLNIOd NOISNIASNS WYHOHLV 1d FIINHIS ALON NOILOAS
28. nal 8 Valve Adjustments For A1044 Amplifier See bulletin MT2035 for additional M MR valve information NOTE Low fire adjustment should be checked whenever the high fire adjustment is changed MR 212 VALVE Low Fire or Bypass Adjustments Disconnect wire from amplifier terminal 8 this causes valve to call for continuous low fire Remove cap B and loosen lock screw C Turn D to desired low fire adjustment Clockwise rotation reduces minimum flow rate Tighten set screw C replace cap B and reconnect wire to amplifier termnial 8 M411 511 611 VALVE High Fire Manifold Adjustments High Fire Manifold Adjustments 1 Disconnect wires from amplifier terminal 2 amp 4 1 Disconnect wires from amplifier terminal 2 and 34 this This causes the valve to go to continuous high fire causes the valve to go to continuous high fire 2 Remove seal cap a and turn MODULATOR 2 Adjust the pressure regulator to obtain the desired regulator pressure adjusting manifold presure screw to obtain desired manifold 7 w c maximum pressure Clockwise rotation Reconnect the wires increases pressure to amplifier terminal 3 Reconnect the wires to amplifier terminal 2 amp 4 A NOTE If low fire bypass is on maximum the desired high fire outlet pressure may not be achieved Disconnect wire from amplifier terminal 8 this causes the valve to go to Low Fire or Bypass Adjustments 1
29. off valve must be disconnected from the gas supply piping system during any pressure testing of that system at test pressures in excess of 1 2 psi 3 5 kPa The heater must be isolated from the gas supply piping system by closing its individual manual shutoff valve during any pres sure testing of the gas supply piping system at test pressures equal to or less than 1 2 psi 3 5 kPa b If steam hot water or chilled water coils are used all piping connections must be made according to accepted trade practices or the general arrangement drawings furnished with the unit Because of the many variations of supply and drain connections required it is not possible to include all piping connec tions in this manual Piping must comply with Standards of National Board of Fire Underwriters and all applicable local codes Standard pipe caps are furnished on manifold for shipment from factory c Pipe couplings for connection of condensate drains on applicable units are furnished Standard pipe caps are furnished for shipment from factory A trap must be installed in the drain line to minimize the loss of conditioned air 6 Duct Connection s a Indoor Units See Figures No 3 and No 4 1 Lifting lugs serve as suspension points on all indoor type units see Figures No 5 and 6 2 Make required opening in wall and line with an angle frame Inside should be completed before out side is started to avoid any crumbing of penetrated wall see
30. om the coil Do not bush or reduce return trapping size Do not drain steam mains or branch lines through coils Steam lines should always be drained ahead of control valves When more than one coil section is installed a separate steam trap must be provided for each Use only bucket or float and thermostatic traps for condensate removal Use thermostatic traps for vent ing only Steam traps should be sized for three 3 times the calculated condensate load at coil design conditions Traps should be selected for the pressure differential across the trap not boiler pressure Strainers should be installed ahead of traps to prevent dirt and sludge from affecting operation Vacuum breakers should be provided 1 2 15 degree swing check valve is recommended installed as close to the coil as possible The vacuum breaker line can be vented to atmosphere or connected into the return line on the distant side of the steam trap on low pressure systems On steam systems at 15 PSIG and above air and non condensable gases should be continuously vented from the return by a 1 4 pet cock in a riser off the condensate return ahead of the trap The petcock should be left open for continuous venting Vent air lines should not be returned to the condensate return main If condensate must be lifted above coil return level into overhead mains or if return mains are pressurized a pump and receiver should be installed between condensate traps and retur
31. ons not shipped attached must be assembled in the field with splice channels and 1 2 bolts that are provided Models SB 112 through SB 218 are shipped with burner section and blower section assembled Intake hood and birdscreen filter section intake or discharge damper sections or other large accessories are assembled but shipped as individual items Models SB 222 through SB 240 are shipped as separate sections All sections are shipped in horizontal position SB 112 through SB 218 has top mounting channel and base channel shipped assembled with blower burner section SB 222 through SB 240 has top mounting channel shipped as one section but not physically attached to either blower or burner sec tion see Figure No 11 Unit base assembly is shipped separately for field connection to mounting channels and anchoring to floor Optional filter and or inlet damper section s mount in base assembly see Figures No 12 and 13 All 1 2 bolts and splice plates for unit assembly in the field are included with each unit The vertical SB unit is designed to simplify field installation All parts have been designed in module form to facilitate field installation of parts and accessories The purpose of this manual is to supple ment but not to replace the services of qualified field personnel to supervise the initial start up and adjustment of vertical SB unit Persons without previous experience with large commercial and indus trial make up air
32. otentiometer A clockwise If the temperature is above the set point rotate the calibration potentiometer counter clockwise 9 2 Ifcalibrating the remote temperature selector rotate the calibration potentiometer Figure No 16 until the correct temperature is obtained If the temperature is above the set point the cali bration potentiometer A should be turned counter clockwise H SEQUENCE OF OPERATION 1 Typical sequence of operation gas units see attached wiring schematic SBD S2 AD Figure No 19 Closing fused disconnect switch FD supplies 115 volt power to control circuit through 115 volt control trans former T2 Unit is ready for operation Summer Operation If three position season switch SW is in the summer position and two position blower switch BL is power is supplied to the two position fresh air discharge air damper motor DM After approximately one minute the damper motor has reached its full open position closing the damper proving switch DP Power is supplied to blower motor starter IM Blower motor MI will run if blower motor overloads OL s are not tripped Burner is inoperative System white light W in remote control panel will be operational Winter Operation If three position season switch is in the winter position and if the high limit switch HL is operational blower starts as explained in summer operation above If air flow is sensed by the air prov
33. power to the unit visually inspect all nameplates control voltage wiring control transformer and main fused disconnect switch on the unit cross check with bill of material to insure that the voltage option on the order is the voltage option received If optional motorized dampers are used connect electrical wires supplied in factory furnished conduit with unit to damper motor as shown on electrical wiring diagram Adjust linkage so that damper will close when blower switch in remote control panel is in off position If unit includes selectra modulation with discharge temperature selector dial the discharge temperature selector dial may be moved from shipping position in side master control panel on the unit to desired location Run wires in separate conduit above is required Complete all wiring to any optional accessories as shown on unit bill of material and electrical wiring diagram as required before applying voltage to the unit The total of the main fused disconnect switch blower motor and control circuit transformer fusing is affected by the addition of 25 to the full load amps as required by the National Electric Code Check the supply voltage before energizing the unit The maximum voltage variations should not exceed 10 Phase voltage unbalance must not exceed 2 Use proper wire sizing practices when running wires for the remote control panel If the automatic gas ignition control system is exterior to the
34. put is decreased until the modulating high limit control is satisfied The sequencer automatically recycles to the off position on any interruption of power System heating light A in remote control panel will be on when season switch is in the winter position 10 MISCELLANEOUS MAINTENANCE 1 Filters check filters at least once each season and clean or replace as necessary Standard filters are of the heavy duty fiberglass mesh throw away type No attempt should be made to clean and re use these filters Replacement filters should be an equivalent to the type supplied standardly with the unit See bill of material for size type and number required The optional cleanable filters are of the high velocity aluminum mesh type These filters may be washed with water as the mesh is originally coated with water soluble oil solution The filters should be dried and recoated with oil solution such as Evans Filter Fluid Replacements for damaged filters should be of an equivalent type as originally supplied with the unit See bill of material for size type and number re quired The oil coating solution is available from the filter manufacturer Filter racks as supplied with some sizes of SB units may have at least one filter spacer to eliminate the by passing of unfiltered air These spacers if used must be re installed after the completion of any mainte nance work Blowers check blower and related components at l
35. ry bulb to reset b Gas pressure switch es if required may have shipping screws Remove screws if supplied Unit programming controller may be shipping with paper shipping block Remove programmer cover and remove paper shipping block re install cover and adjust manual reset Open pilot cock and purge air from gas line through plugged tee in pilot line only if Gas Pilot Ignition was provided Check setting of inlet air controller This is factory set at 65 F to shut down burner when outside tem perature rises above 65 If unit is to be test run when outside temperature is above 65 this setting will have to be raised for burner to operate After unit has been test run reset controller at 65 F If 70 F discharge temperature is not desired move appropriate discharge selector dial to new position and set inlet air controller to a temperature at least 5 F below this setting Note No adjustment re quired on modulating gas valve High and low fire positions are factory set for proper operation In some cases it may be possible or desirable to reduce the low fire be sure to keep continuous flame the full length of burner Close main disconnect switch Standard units are operated from the toggle switches in the remote control panel If it is necessary to check blower motor rotation from the unit jumper the respective electrical terminals at the unit as shown on the electrical wiring diagrams Move blower sw
36. s a All sections not shipped attached must be assembled in the field by 1 4 20 x 5 8 sheet metal screws provided in the cloth bag with each ship along section See previous instructions Important Notice to Equipment Users or follow general arrangement drawing provided for this unit to determine which items are crated and shipped separately Figure No 1 through Figure No 4 show typical unit assem blies For outdoor or weather proof models water proof caulking is provided to seal all joints between op tional sections as they are bolted together Perimeter caulking on each ship along section must be completed to insure a water tight unit If filter section is used bolt to appropriate section by sheet metal screws provided Provide caulking as required Filters and filter spacer s if required will be shipped installed in filter rack wherever pos sible If filters are shipped separately install filters and filter racks see filter maintenance for details Filter spacer s will be banded to filter channel where shipping necessitates filters going separately from filter section If intake or discharge dampers are used bolt to appropriate section with sheet metal screws provided Provide caulking as required Re connect conduit and wiring to damper motor s as required Electri cal wires for damper motor s have been tagged for ease in connecting in the field Vertical Unit Installation see Figure No 11 All secti
37. shipped mounted and wired whenever possible within the limita tions of shipping and handling Any accessories which include wiring that are shipped separate intake or discharge dampers require no additional conduit or wiring in the field All wire leads will be tagged for reconnection in the field The SB unit is designed to simplify field installation All parts have been designed in module form to facilitate field installation of parts and accessories The purpose of this manual is to supplement but not to replace the services of qualified field service personnel to supervise the initial start up and adjustment of the SB unit Persons without previous experience with large commercial and industrial make up air equipment should not attempt the initial adjustment and check out procedure essential before such installations may be considered as ready for operation C EQUIPMENT SERVICING AND SHIPPING INFORMATION 1 Periodic Service Periodic service on any piece of mechanical equipment is necessary for efficient operation Hastings has nationwide service organization available to make quick and dependable servicing of make up air return air heating ventilation or air handling type equipment Representatives of this service organization are trained at the factory by qualified engineering and service personnel In addition the company has trained service engineers who are always available for consultation on any service problems
38. ss checked with the position of support beams and stand pipes to in sure that support structure dimensions coincide with those of the unit Under structure beam spacing should also be checked to preclude any interference with air ducts Allow adequate clearance on both sides of unit for access to bearings motor and all internal components The heater inlet shall be located in accordance with the applicable building code provisions for ventilation air Location of Accessories The remote control panel will be located in the burner or electric section of the unit and must be removed and installed by the electrical contractor Remote control panels for air handling units will be located in the blower section for shipment See remote control panel details in this bulletin Field constructed intake acces sories should be properly designed to minimize the entry of snow and rain Instructions that adequate build ing relief shall be provided so as to not over pressurize the building when the heating system is operating at its rated capacity It should be noted that this can be accomplished by taking into account through standard engineering methods the structure s designed infiltration rate by providing properly sized relief openings or by interlocking a powered exhaust system or by a combination of these methods Electrical Connections All wiring must comply with all applicable local state provincial and national electric codes Prior to running
39. system is attached to the inlet of the heater to purge the volume of the duct system with at least four air changes prior to an ignition attempt If in doubt regarding the application consult the heater manufacturer Remote Control Panel a Standard remote control panel This panel is furnished with two heavy duty toggle switches and three 115 volt signal lights The switches control the blower blower switch and the burner season switch The signal lights indicate supply blower operation white light marked blower burner op eration amber light marked heating and safety lockout red light marked lockout See typical remote control panel illustrated in Figure No 9 in this manual b Optional remote control panel s Same as described above but with the addition of lights and switches depending upon options ordered Remote Control Panel Specifications Signal Lights Pilot lights are rectangular neon type for 115 V A C service Lights are UL approved and have 18 AWG 16 30 standard 105 C plastic wire leads Bezel is chrome finished Switches On Off and On Off ON switch action with screw terminals Rated at 15 AMPS at 115 V A C service with 3 4 HP rating at 115 V A C Lids and Cover Remote control panel lids are 16 gauge brushed stainless steel 1 8 high letters are screen painted using Wornoy Duwell Enamel series 10 000 ink Wiring box dimensions are 8 x 5 x 3 1 2 deep Terminal Blocks Blocks are medium duty 15 AMP s
40. t feet It may be bolted or welded to either trusses or roof decking however connection to roof trusses is recommended The curb is designed to carry the weight of the unit Additional support is required for certain applications Placement of the curb is critical in squareness and leveling Shims for leveling must be applied to the curb application of shims to the unit will tend to destroy the sealing effect after installation Make sure sealing tape and adaptor strip are in place before unit is set A bubble level must be used in the leveling process Squareness must be checked by measuring diagonals Allowable tolerance is 1 4 difference between diagonal measurements Double check approval prints before setting of unit Upon completion of setting the curb apply roofing material and flashing as required The unit manufacturer will not assume responsibility for leaks if the curb adaptor strip and sealing tape are not used Be careful not to allow gaps where two pieces of sealing tape meet Unit is now ready for set ting on the roof SBD 222 227 233 and 240 require a field fabricated sheet metal skirt around base of unit Contact fac tory for details SECTION 3 K TROUBLE SHOOTING THE GAS SB UNIT 1 If Blower Fails to Operate Check to See If a Main disconnect switch or circuit breaker closed b All main fuses if disconnect switch used are in line c Control transformer is supplying 115 volts to control circuit 11
41. t full speed and adjust take up until only slight bow appears the slack side of the belts see Figure No 14 Do not roll belts over grooves or sheaves as this results in permanent belt damage Move season switch to winter position to light pilot blower must be operating Amber signal light marked heating should indicate that the burner is operating If pilot does not light depress reset button on pro gramming relay If it becomes necessary to adjust pilot flame check the micro ampere reading Adjust to ob tain a micro ampere reading of 2 Make sure all gas cocks are open and gas pressure switch es if re quired are reset for burner operation Unit is factory pre set to provide gas pressure as specified on unit spec data plate mounted on unit for stan dard burner when firing at full input Before making any regulator adjustments be sure there is sufficient inlet pressure Modulation System a Unit with Selectra Modulation 1 Standard selectra system Series 14 a MR212 valve high fire manifold adjustments 1 Disconnect wires from terminal 4 in the amplifier see Figure No 15 this causes the valve to call for continuous high fire 2 Remove seal cap A and turn regulator pressure adjusting screw to obtain desired manifold pressure Clockwise rotation increases pressure See Figure No 17 3 Reconnect the wires to terminal 4 b MR212 valve low fire or by pass adjustment 1 Disconnect wire fro
42. th the carrier Widely varying conditions under which the units are transported to the jobsite unloaded and installed make it impossible for Hastings to assume responsi bility for handling of equipment in transit SPECIFICATIONS General Units are of the horizontal type with choice of HR 1 HR 2 and HR 3 blower discharge arrangements Ver tical units and units with a variety of blower discharge arrangements are available on request Cabinet All cabinet parts are made from coated steels All outside surfaces are primed and finish coated Lifting lugs are provided for ease in handling see Figure No 1 and Figure No 2 Blower s There are one or two centrifugal DWDI forward curved fan s SB 240 provided with 2 backward incline fans with a one piece solid shaft or self aligning prelubricated ball bearings on each unit Blower wheel s are statically and dynamically balanced Adjustable drives are standard on all units through 10 HP An open drip proof ball bearing squirrel cage induction T frame motor is provided as standard for all voltages Gas Burner The burner is a direct fired non premix design with cast iron manifold and stainless steel mixing plates A spark ignited intermittent pilot for natural or propane gas at inlet pressure from 6 ounces through 1 pound is standard The burner is capable of a 22 1 turndown ratio Maximum temperature rise is 119 F Gas and electric Controls The following are furnished as standard componen
43. that heating con trol relav coil is energized and contacts are closed Freezestat s are n c and in the electrical circuit Freezestat control relav coil energized and contacts are closed Also check the following optional controls if used to see if a Damper motor end switch is closed damper motor must be full open If blower runs but remote control panel blower light doesn t come on air proving switch is faulty dis charge is blocked belt s are loose and slipping or blower is running backwards Also check to see if air proving sensing tube is plugged or has been crimped If blower operates and blower signal light is on but system fails to heat air to desired temperature check to see if a Season switch in remote control panel is in winter position b Heating relav contacts are closed Two position or modulating valve and controller if modulating system is functioning properly 14 d steam and hot water lines are open and free flowing e Steam pressure water temperature and flow rates are per specifications f On two coil systems that outside air temperature controller is functioning properly NOTE We cannot guarantee coils against freezing butthe likelihood of freezing can be minimized if the 10 installer takes the following precautions Provide adequate sizing of condensate return lines traps and vents to provide for speedy flow of con densaate fr
44. tions for field installed wiring and control wiring NOTE Refer to heater rating plate for determining the minimum gas supply pres sure for obtaining the maximum gas capacity for which this heater is specified TABLE OF CONTENTS SECTION 1 General Information A Installation and Service 2 B Notice to Equipment Users 2 Equipment Servicing and 2 2 2 2 2 9 2 2 5 DS ANI E ra ici a n 3 SECTION 2 Installation E Installation Procedures ocioso A bedt oe 4 Fr Inspection EEE EE NG 7 G A A A 8 H Sequence 10 Miscellaneous Maintenance 11 J Installation of Roof Cursi 11 SECTION 3 Trouble Shooting K Trouble Shooting the Gas Unit 12 L Trouble Shooting the Electric Unit mnn 13 Trouble Shooting the Steam or Hot Water Unit 1 14 SECTION 4 Illustrations Unit Assembly Figure sai 16 Unit Assembly gu EE 17 Unit SUSPENSION Figu B aq 18 Suspension
45. ts on all SBD gas fired units NEMA 1 control box re mote control station with switches and indicating lights electronic flame safeguard system with ignition transformer pilot controls and electric safety shut off valve main gas hand shut off valve main and pilot gas pressure regulators motor starter control transformer high temperature limit switch air flow switch automatic mild weather burner cut out and a modulating gas control system If the low temperature control system is not an integral part of the heater then it is recommended that a low temperature limit control be installed in areas where freeze up protection is needed in the event of burner shutdown Electric Heating The following are furnished as standard components on all SBE electric heating units the heating section is UL listed with open type electric heating elements control panel circuit fuses step controller and trans former with primary and secondary fusing automatic reset thermal cut out heat limiter type secondary safety protection de energizing contactors and connecting block s for wiring of power supply All fusing per NEC and UL Control transformer and disconnecting means are optional Steam or Hot Water Heating The following is standard on all SBS and SBW units coil section for indicated pressure or water tempera ture Heating units shall have standard type Heating ventilating and make up air units shall have steam distributing type coil s
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