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FEATURES & SPECIFICATIONS 

HeatNet Control  REV 1.38-1

 

 

 

 

 

 

 

 

Page 7 

 

 

 

 

Specifications 

 

Control 

 

 

Microprocessor based PID modulating control (

NOT a safety limit

 ) 

 
Environment  

 

-40 F to 140 F, <90% RH non-condensing 

 
Input Power   

 

24 VAC, 500 ma 

 
Relays 

System Pump, Damper, Circulator, Alarm, DHW Pump 8A 250 VAC resistive 

 
 

K8 on J4.1 &.2 for Base Loading and Dual Fuel 1/4 Amp  

 
AC Interlocks 

 

24 VAC – 120 VAC input 

 
Control Inputs 

 

AA, Heat Demand, 4-20ma Enable, OA override, T1-T2 (dry contact inputs) 

 
 

 

 

 

4-20mA, 0-10 VDC (20mA source current) 

 
Dimensions   

 

Board: 9” wide:  6” high : 2” deep,  Enclosure: 11 ¾” wide:  10” high : 5” deep 

 
Temperature Sensors   

NTC thermistor, 10K @ 77 F, ,+/- 1 F; 1k PT RTD 

 
USB 

 

 

1.0 

 
RS485 MODBUS 

 

Modbus RTU 

 

 
Boiler-to-Boiler 

 

HeatNet (H-Net) 

 
Network 

Optional LonWorks, BACnet available bridge to MODBUS port

 

 

 

 

 

 
 
 
 
 
 
 
 
 

 
 

Содержание Smith Series

Страница 1: ...can only be operated with a dust free air supply Follow the instruction manual procedures to duct air to the boiler air intake If the boiler has been contaminated by operation with contaminated air fo...

Страница 2: ...XED BOILERS 13 MIXED SYSTEM EXAMPLES 13 BASE LOADING RELAY CONTROL 17 SETTING UP BASE LOADING 18 Heating Control Methods 20 HEATING METHOD 1 20 HEATING METHOD 2 20 HEATING METHOD 3 20 HEATING METHOD 4...

Страница 3: ...ced Menu Tree Smith Version 1 38 69 Worksheet 70 Thermistor Resistance Temperature Table 73 Status Screen Fault Display 75 Line 4 Log Entries 78 Information contained in this publication regarding dev...

Страница 4: ...unction The control will continue to function and report the fault but its ability to control the boiler will end Each Smith boiler employing this control can function as either a master or a member T...

Страница 5: ...t water temperature is also monitored If the outlet temperature approaches the operating limit temperature setpoint adjustable the boilers firing rate is limited and its modulation value is reduced to...

Страница 6: ...nterface 16 Alarm Relay dry contacts and Audible Alarm 17 Runtime hours and Cycles based on Main Valve Open 18 Outdoor Air Reset with programmable setpoint and ratio 19 Time of Day clock to provide up...

Страница 7: ...VAC resistive K8 on J4 1 2 for Base Loading and Dual Fuel 1 4 Amp AC Interlocks 24 VAC 120 VAC input Control Inputs AA Heat Demand 4 20ma Enable OA override T1 T2 dry contact inputs 4 20mA 0 10 VDC 2...

Страница 8: ...02 4285 Sensor with well ACI CP I 2 5 02 4286 Sensor with well ACI CP I 4 02 4281 Strap on sensor ACI 10k CP S 02 4280 Outside Air Sensor with Housing ACI 10k CP O Installation Operation Manual 40 54...

Страница 9: ...ntimes to determine which boiler has the least runtime based on the MIN RUNTIME setting in ADVANCED SETUP FIRING MODE The MIN RUNTIME setting is the minimum runtime interval in hours that is used to c...

Страница 10: ...nomy A boiler set can be constructed by simply setting the firing priority on each boiler to be in a set at the same priority Setting all example condensing boilers to the highest priority of 1 and th...

Страница 11: ...priority boiler set may be configured here Temperatures are adjustable Once the conditions menu has been entered the firing order and stop order of the priority 1 boiler set can be selected based on u...

Страница 12: ...emp if the difference temp is not required Start Stop settings Any combination of Start Conditions and Stop Conditions can be used to optimize the mixing of condensing Priority 1 and non condensing bo...

Страница 13: ...amples using the Boiler System Response graphs The Smith Mixed Boiler System examples is advantageous in providing low BTU input for light loads and high BTUs for heavy loads The effective system turn...

Страница 14: ...AX value to allow a guard band tolerance 4 If boilers are of different sizes try to use larger priority 2 boilers 5 If the calculated Mod MAX value is greater than 99 the combination can not be used s...

Страница 15: ...000 4 000 000 5 000 000 Input System Load Btu Hr Blr 1 2 1200 MBTU Blr 1 2 3 4 3512 MBTU Blr 1 2 3 2356 MBTU Figure 9 Boiler System Response 1 chart illustrates how each boiler in the example is brou...

Страница 16: ...ample system uses 2 KN6s and 2 28A W 5s Two of the KN6s are treated as one when adding the min inputs of the Priority 1 set Figure 12 Boiler System Response 4 2 KN6 s 2 28A W 5 s 85 Mod Max 0 00 0 10...

Страница 17: ...he boiler can start again Once this time expires the DELAY TIME also needs to expire to start the boiler This will help in minimizing short cycle conditions and can be set at ADVANCED SETUP FIRING MOD...

Страница 18: ...r The default setting is for the Base Load boiler to stop first once the water temperature exceeds the top of the heating band Figure 14 Base Load Relay Wiring Base Load RIB Relay 24 VAC 24 VAC Return...

Страница 19: ...sable the boiler when the OA T read from the Outside Air Temperature sensor if equipped rises above this value ADVANCE SETUP BASE LOADING STOP OA T If the OA T qualifier is used as the Start and Stop...

Страница 20: ...rotect itself from short cycling by limiting the firing rate coming from the Master This occurs in the event that the member s supply temperature increases above the OPERATE LIMIT OPERATE LIMIT BAND O...

Страница 21: ...C signal by each boiler The temperature of the water is maintained by sending this signal to the Mod Motor which in turn controls the damper position and fuel rate providing the firing rate control Me...

Страница 22: ...inimum fire rate of 25 If the MINIMUM setting of the boiler is set above the example 4 1 turndown of 25 such as 33 a control signal change between 25 and 33 will not change the boilers firing rate Onc...

Страница 23: ...signal is sensed the boiler will initiate a start sequence and fire the boiler at its minimum setting if the REMOTE ENABLE input is closed This is typically 33 3 1 turndown or 25 4 1 turndown of the b...

Страница 24: ...setting has been met when using OUTDOOR AIR RESET 2 The second mode will allow the circulator pump to be turned on whenever there is a call for heat any control input This mode will stop the circulato...

Страница 25: ...o be used for the damper prove switch when a common system damper is used If you use terminal 8 to supply power from the Maste r and the Master is powered OFF no boiler will be allowed to fire due to...

Страница 26: ...ry 10 minutes in an attempt get the boiler restarted The damper fails to open and never closes its proof switch a retry algorithm will attempt a retry Every 10 minutes the damper relay will cycle and...

Страница 27: ...s from the MASTER boiler is re established Ensure that this Member boiler s Damper and System pump control are configured correctly with the assumption that the Master is not powered Also ensure that...

Страница 28: ...mperature to the setpoint post purge time of the DHW pump Setting up this method is done via the menus in SETUP DOMESTIC HOT WATER 1 Connect a 10k thermistor from the DHW tank s sensor well to J10B te...

Страница 29: ...TPOINT to the desired target temperature of the water in the tank Once the control determines there is a call for DHW the DHW SETPOINT is loaded and the Master boiler will target this new setpoint 4 N...

Страница 30: ...ensure that all boilers are shut off at the upper point of the heat band set the SHED BOILER DELAY time to 0 This will effectively turn off all boilers at the upper heat band point of example 145F Now...

Страница 31: ...defined threshold The Stack Temperature is monitored since it is a good indicator of the boilers health The sensor that measures this temperature is a 1k ohm RTD type sensor which can handle the highe...

Страница 32: ...ed on the flash drive press and hold the BACK key for 5 seconds to enter the Setup menus Select the ADVANCED SETUP SYSTEM LOAD FIRMWARE Select YES using the arrow keys and press the SELECT key Select...

Страница 33: ...WIRING CONNECTIONS HeatNet Control REV 1 38 1 Page 33 Wiring Connections Figure 26 Power Connections...

Страница 34: ...4 V D C 2 4 V D C 0 1 0 V D C 1 1 8 I N T E R L O C K S R E T A B G A B G A B G S e n s e 2 4 V A C L 2 L 1 L 1 3 P O W E R S E R V I C E L 2 A C G N D 1 O U T P U T 0 1 0 V D C I G N I T I O N C O N...

Страница 35: ...DC SPARE 2 WTR OUT OUTSIDE 0 10VDC EXT OPERAT VFD WTR FLW GAS PR SYSTEM 24V 24V BOILR START 24VAC TRANSFORMER PILOT VALVE MAIN VALVE HIGH LIMIT Unused 4 20ma PWM 0 10 1 1 8 AIR WTR IN AIR PR SW VALVE...

Страница 36: ...12A J12B J13 J 1 0 A F 1 J 4 J 1 6 J18 J 1 9 J 1 4 K1 K4 K5 K6 K2 BZ1 J P 3 K1a T 7 7 _ R E L A Y K2a T 7 7 _ R E L A Y K4a T 7 7 _ R E L A Y K5a T 7 7 _ R E L A Y K6a T 7 7 _ R E L A Y J10 J 1 1 J 1...

Страница 37: ...FD OUTPUT O U T P U T DHW PUMP D H W T A N K AUX STATUS Aux Status PUMP VALVE M O D B U S H N E T A L R M R S T D A M P E R H E A D E R R E T U R N S U P P L Y P W M 0 1 0 4 2 0 m a 8 SPARE 4 LWCO KNS...

Страница 38: ...O N T R O L Unused 1 1 1 1 J u m p e r2 3 fo r1 3 5 o h m 2 3 HEAT NET K 8 J 2 2 J 2 0 J 6 D 5 D 4 K7a T 7 7 _ R E L A Y K7 J 2 S 4 S2 SIP1 2 0 1 9 1 2 J9 F 3 J 1 0 B U 2 6 J12A J12B J13 J 1 0 A F 1...

Страница 39: ...B G S e n s e 2 4 V A C L 2 L 1 L 1 3 P O W E R S E R V I C E L 2 A C G N D 1 O U T P U T 0 1 0 V D C I G N I T I O N C O N T R O L J u m p e r2 3 fo r1 3 5 o h m J 2 2 J 2 0 J 6 D 5 D 4 T 7 7 _ R E...

Страница 40: ...e n s e 2 4 V A C DHW PUMP LOWFIRE L 2 L 1 L 1 3 P O W E R S E R V IC E L 2 A C G N D 1 02 2008 OPERATOR O U T P U T 0 1 0 V D C W B R MODULATION CONTROL 4 20mA BLOWER M I G N I T I O N C O N T R O L...

Страница 41: ...4VAC TRANSFORMER PILOT VALVE MAIN VALVE HIGH LIMIT Unused 4 20ma PWM 0 10 1 1 8 A I R W T R I N AIR PR SW VALVE ALRM FLAME SAFE I N T E R L O C K S ENABLE HIGH FIRE R E T 4 20mA CAL NORM PWM 0 10 WTR...

Страница 42: ...AMPER 24 VAC Transformer DAMPER Prove Switch DAMPER Enable 24 VAC Mains MASTER BOILER MEMBER BOILER 1 Connection if Member boiler is running as Failsafe MEMBER BOILER 2 Connect to 24 VAC Return on eac...

Страница 43: ...lsafe Common System Pump Wiring System Pump Contactor System Pump Voltage Feed System Pump System Pump Voltage Return 120VAC Ph2 Ph3 120 Return System Flow Prove Switch 120VAC MASTER BOILER MEMBER BOI...

Страница 44: ...es can be changed while running ONLY IN MINIMUM FIRE any but only one of the T inputs closed Prior to ignition the values may be changed but the blower will not operate Press the arrow keys until MIN...

Страница 45: ...ate is defined as the Boiler s that is running the Circulator Pump state and the ignition condition Main Valve Pilot Valve Blower and the Ignition alarm The of boilers that are displayed is limited to...

Страница 46: ...Setpoint is used 4 20mA input is mapped to a setpoint OUTDOOR AIR RESET OA RESET OFF Outdoor reset ratio boiler water temp outside air temp WARM WEATHER SD NO If set to YES the boiler system shuts do...

Страница 47: ...efore proving flow NIGHT SETBACK SETBACK ENTRY 1 1 4 Four setbacks to adjust setpoint during a time period ENTRY IS OFF Enable or disable the use of this setback SETBACK 20 F 0 50 F Temporarily subtra...

Страница 48: ...f Using J12B in a common damper configuration wiring is done beginning with the Master boiler J12B Pins 7 8 are connected to the prove switch of the combustion damper Pin 8 is supplying 24 VAC and pin...

Страница 49: ...e delta T s If this Master boiler is running LOW TEMP HOLD 130 F 130 160 F The boiler will be held in low fire until the return temperature exceeds the set value The default is 130F but can be increas...

Страница 50: ...ded If a second boiler needs to stop the SHEDBOILER DELAY will need to expire before stopping MODULATE DELAY TIME 10 secs 0 60min This is the time the boiler remains in min fire before it relinquishes...

Страница 51: ...0s Once the Main Valve opens on the newly added boiler and the MOD MODE ADAPTIVE the Master waits this amount of time before releasing the PID to control modulation This allows for the newly added bo...

Страница 52: ...rforms the tasks of the MASTER boiler If the HEADER sensor is set to NONE its function is the MEMBER The remaining 2 sensors perform as user selections and provide functions such as Combustion Air Pro...

Страница 53: ...settings used by the MIXED boiler rotation algorithm Priority 2 is the default and lowest priority Priority 1 is the highest priority A Priority may be assigned to a set of boilers which fires and rot...

Страница 54: ...he system setpoint When the timer reaches zero the control assumes that the BMS is no longer operating and the local setpoint saved on the control is reloaded This is a failsafe feature used to help s...

Страница 55: ...les Read Only Address Name Raw Data Type Scale Description Valid Values Range 30001 BoilersOn 8 bit unsigned The number of boilers currently running 0 16 30002 Modulation 8 bit unsigned 0 01 Current s...

Страница 56: ...ler15Status2 30046 Boiler16Status1 30047 Boiler16Status2 30048 Boiler01RuntimeHigh16 16 bit unsigned Boiler 1 16 Runtime seconds High Upper and Low Lower 16 bit counters To get the actual runtime for...

Страница 57: ...r02SupplyTemp 30098 Boiler03SupplyTemp 30099 Boiler04SupplyTemp 30100 Boiler05SupplyTemp 30101 Boiler06SupplyTemp 30102 Boiler07SupplyTemp 30103 Boiler08SupplyTemp 30104 Boiler09SupplyTemp 30105 Boile...

Страница 58: ...yclesHigh16 30149 Boiler11CyclesLow16 30150 Boiler12CyclesHigh16 30151 Boiler12CyclesLow16 30152 Boiler13CyclesHigh16 30153 Boiler13CyclesLow16 30154 Boiler14CyclesHigh16 30155 Boiler14CyclesLow16 301...

Страница 59: ...unning 6 Pump Running 0 off 1 running 7 Spare 3 Interlock 0 open 1 closed 8 LWCO Interlock 0 open 1 closed 9 VFD Interlock 0 open 1 closed 10 Gas Prove Interlock 0 open 1 closed 11 Spare 4 Interlock 0...

Страница 60: ...r Reset Override 0 off 1 on 4 T1 0 off 1 on 5 T2 0 off 1 on 6 T3 0 off 1 on 7 T4 0 off 1 on 8 reserved for future use 9 reserved for future use 10 reserved for future use 11 reserved for future use 12...

Страница 61: ...s to be disabled in the AUX FUNCTIONS menu Situation The display is displaying random characters or the control keeps resetting There may exist a grounding problem with the controller or one of the bo...

Страница 62: ...ion Only the MASTER boiler Fires but the system has many boilers and is using H Net 1 In order for the MASTER boiler to act as a MASTER the header sensor must be set to TYPEZ and there must be a heade...

Страница 63: ...blower speed and in the operating limit band there may be not enough flow through the boiler or the Operating Limit Operating Limit Band may be improperly set The Operating Limit Operating Limit Band...

Страница 64: ...he polarity to determine the proper connections A ground wire must always be used and a shielded twisted wire is STRONGLY suggested Situation We are using a Building Management System BMS to control t...

Страница 65: ...OPERATION HeatNet Control REV 1 38 1 Page 65 Smith Series Run Screen...

Страница 66: ...re please see the Default Settings Menu Item Descriptions SETUP starting on page 46 Status information screens This screen indicates that the boiler s SUPPLY Temperature has gone above the OPERATOR LI...

Страница 67: ...time has not expired This Screen indicates that the boiler s input is temporarily being limited to optimize the boiler s efficiency This screen indicates that the boiler is running in LOCAL MODE beca...

Страница 68: ...OPERATION HeatNet Control REV 1 38 1 Page 68 Smith Series Menu Tree Version 1 38...

Страница 69: ...DELAY TIME 4 MINUTES SHED DELAY TIME 2 MINUTES 0 SECONDS MODULATE DELAY TIME 0 MINUTES 10 SECONDS STOP MOD MAX 70 MOD MODE ADAPTIVE DROP DOWN ON PILOT DELAY RELEASE 0s 4 20mA INPUT BOILER START 4mA S...

Страница 70: ...A TEMP WATER TEMP LOW OA TEMP PUMP OPTIONS SYSTEM PUMP POST PURGE TIME ALWAYS ENABLED SUMMER PUMP JOG LOCAL PUMP DELTA TEMP ENAB DELTA TEMP POST PRGE TIME s ALWAYS ENABLED PUMP VALVE OPTION REMAINS ON...

Страница 71: ...71 TYPE IN USE INPUT PROOF TIME ALARM SILENCE SWITCH IN USE INPUT FAILSAFE MODES H NET COMM LOST LOW TEMP TEMP HEAT EXCHANGER EXCHGR DELTA T 40F LIM HALF RATE DHW SETPOINT DHW DIFF USE SENSOR DHW PRI...

Страница 72: ...LAY RELEASE FIRING MODE MODE MIXED START PRIORITY 1 SET STOP PRIORITY 1 SET MIN RUNTIME MIN OFF TIME PREDICT START BASE LOADING BASE LOAD BOILERS START MOD STOP DELAY TIME SENSORS SENSOR OUTDSIDE SUPP...

Страница 73: ...13 130 410 75 167 1 479 20 4 97 072 80 176 1 255 15 5 72 951 85 185 1 070 10 14 55 326 90 194 915 4 5 23 43 326 95 203 786 6 0 32 32 650 100 212 678 6 5 41 25 391 105 221 587 6 10 50 19 899 110 230 51...

Страница 74: ...6 150 1 254 249 480 1 937 432 810 2 581 71 160 1 275 254 490 1 957 438 820 2 600 77 170 1 296 260 500 1 977 443 830 2 619 82 180 1 317 266 510 1 997 449 840 2 638 88 190 1 339 271 520 2 017 454 850 2...

Страница 75: ...the input to the High Limit Control SPARE 4 This is a reserved interlock input that is user defined The interlock is located on J5B SPARE 4 LOW WATER CUTOFF If there is a low water condition reported...

Страница 76: ...ime specified in the combustion air damper menu the boiler will not start and then display the fault A combustion damper fault on a boiler can only be cleared by power cycling OPEN SENSOR If the open...

Страница 77: ...rature exceeds 550 F this message will be displayed If the stack temperature continues to rise above 700 F the boiler will be held in low fire CALL SERVICE If the H Net control closes the last interlo...

Страница 78: ...FAIL If the combustion air damper is used and does not prove across J12B DAMPER this message is displayed SYSTEM RESET O stack overflow U Stack Underflow both are software faults R Reset Instruction F...

Страница 79: ...faults are result of the interlocks connected to the 24VAC interlock inputs J11A and J11B Low Water Cutoff Low water condition in boiler Var Freq Drive The Variable Frequency Drive Interlock has trip...

Страница 80: ...LOST FAIL SAFE LOW TEMP If the Fail Safe modes are active these log entries indicate that they became active for some reason and the boiler had entered Fail Safe mode BASE LOAD BOILER The Base load B...

Страница 81: ......

Страница 82: ...Smith 260 North Elm Street Westfield MA 01085...

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