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Laars OMNITHERM ONH1250, Assembly, Installation And Operation Instructions

The Laars OMNITHERM ONH1250 user manual provides detailed assembly, installation, and operation instructions for optimal performance. Download the manual for free from manualshive.com to ensure proper setup and maintenance of this high-quality product. Take control of your heating with the Laars OMNITHERM ONH1250.

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Page 135

Water Outlet Assembly (Models 1750, 2000 and 2500)

PARTS LIST

ITEM  

NO.

DESCRIPTION

HYDRONIC   

QTY.

VOL WAT 

QTY

PART NO.

1

VALVE, SHUT OFF, 3/4" NPT, BRASS

1

1

R10-143

2

FLOW SWITCH KIT

1

1

250S4030

3

WELL, IMMERSION, 1/2" NPT

1

1

RE2058300

4

SENSOR, TEMPERATURE

1

1

E2371200

5

NIPPLE, CLOSE, BLK, 3/4" NPT

1

-

P0014100

NIPPLE, 3/4 NPT, CLOSE, 316 SS

-

1

P2070700

6

PLUG, PIPE, 1/2 NPT,  HEX HEAD, SST 316 ASME

-

1

P2084800

PLUG, 1/2" STEEL

1

-

P2016000

7

PLUG, 2" NPT, 316 SS, CLASS 150

-

1

P2103300

PLUG, PIPE, 2" NPT, STEEL

1

-

P2109300

8

PLUG, 1/4" NPT, 316 SS, CLASS 150

-

1

P2104000

PLUG, HD.  1/4" NPT, SQ SOCKET, BLK

1

-

P2014200

9

GAUGE, TEMP/PRESSURE, 70°F MAX LO-320°F MIN HI, 0-230 PSI

1

1

30, 50, 60 psi - 

RA0079000

GAUGE, TEMP/PRESSURE, 70°F MAX LO-320°F MIN HI, 0-90 PSI

1

1

75, 125, 150 

psi - R0060600

PARTS LIST

ITEM  

NO.

DESCRIPTION

HYDRONIC   

QTY.

VOL WAT 

QTY

PART NO.

1

VALVE, SHUT OFF, 3/4" NPT, BRASS

1

1

R10-143

2

FLOW SWITCH KIT

1

1

250S4030

3

WELL, IMMERSION, 1/2" NPT

1

1

RE2058300

4

SENSOR, TEMPERATURE

1

1

E2371200

5

NIPPLE, CLOSE, BLK, 3/4" NPT

1

-

P0014100

NIPPLE, 3/4 NPT, CLOSE, 316 SS

-

1

P2070700

6

PLUG, PIPE, 1/2 NPT,  HEX HEAD, SST 316 ASME

-

1

P2084800

PLUG, 1/2" STEEL

1

-

P2016000

7

PLUG, 2" NPT, 316 SS, CLASS 150

-

1

P2103300

PLUG, PIPE, 2" NPT, STEEL

1

-

P2109300

8

PLUG, 1/4" NPT, 316 SS, CLASS 150

-

1

P2104000

PLUG, HD.  1/4" NPT, SQ SOCKET, BLK

1

-

P2014200

9

GAUGE, TEMP/PRESSURE, 70°F MAX LO-320°F MIN HI, 0-230 PSI

1

1

30, 50, 60 psi - 

RA0079000

GAUGE, TEMP/PRESSURE, 70°F MAX LO-320°F MIN HI, 0-90 PSI

1

1

75, 125, 150 

psi - R0060600

7

5

9

2

8

4

1

3

6

Water Outlet Assembly (Models 1750, 2000 and 2500)

PARTS LIST

ITEM  

NO.

DESCRIPTION

HYDRONIC   

QTY.

VOL WAT 

QTY

PART NO.

1

VALVE, SHUT OFF, 3/4" NPT, BRASS

1

1

R10-143

2

FLOW SWITCH KIT

1

1

250S4030

3

WELL, IMMERSION, 1/2" NPT

1

1

RE2058300

4

SENSOR, TEMPERATURE

1

1

E2371200

5

NIPPLE, CLOSE, BLK, 3/4" NPT

1

-

P0014100

NIPPLE, 3/4 NPT, CLOSE, 316 SS

-

1

P2070700

6

PLUG, PIPE, 1/2 NPT,  HEX HEAD, SST 316 ASME

-

1

P2084800

PLUG, 1/2" STEEL

1

-

P2016000

7

PLUG, 2" NPT, 316 SS, CLASS 150

-

1

P2103300

PLUG, PIPE, 2" NPT, STEEL

1

-

P2109300

8

PLUG, 1/4" NPT, 316 SS, CLASS 150

-

1

P2104000

PLUG, HD.  1/4" NPT, SQ SOCKET, BLK

1

-

P2014200

9

GAUGE, TEMP/PRESSURE, 70°F MAX LO-320°F MIN HI, 0-230 PSI

1

1

30, 50, 60 psi - 

RA0079000

GAUGE, TEMP/PRESSURE, 70°F MAX LO-320°F MIN HI, 0-90 PSI

1

1

75, 125, 150 

psi - R0060600

PARTS LIST

ITEM  

NO.

DESCRIPTION

HYDRONIC   

QTY.

VOL WAT 

QTY

PART NO.

1

VALVE, SHUT OFF, 3/4" NPT, BRASS

1

1

R10-143

2

FLOW SWITCH KIT

1

1

250S4030

3

WELL, IMMERSION, 1/2" NPT

1

1

RE2058300

4

SENSOR, TEMPERATURE

1

1

E2371200

5

NIPPLE, CLOSE, BLK, 3/4" NPT

1

-

P0014100

NIPPLE, 3/4 NPT, CLOSE, 316 SS

-

1

P2070700

6

PLUG, PIPE, 1/2 NPT,  HEX HEAD, SST 316 ASME

-

1

P2084800

PLUG, 1/2" STEEL

1

-

P2016000

7

PLUG, 2" NPT, 316 SS, CLASS 150

-

1

P2103300

PLUG, PIPE, 2" NPT, STEEL

1

-

P2109300

8

PLUG, 1/4" NPT, 316 SS, CLASS 150

-

1

P2104000

PLUG, HD.  1/4" NPT, SQ SOCKET, BLK

1

-

P2014200

9

GAUGE, TEMP/PRESSURE, 70°F MAX LO-320°F MIN HI, 0-230 PSI

1

1

30, 50, 60 psi - 

RA0079000

GAUGE, TEMP/PRESSURE, 70°F MAX LO-320°F MIN HI, 0-90 PSI

1

1

75, 125, 150 

psi - R0060600

7

5

9

2

8

4

1

3

6

Water Outlet Assembly (Models 1750, 2000 and 2500)

PARTS LIST

ITEM  

NO.

DESCRIPTION

HYDRONIC   

QTY.

VOL WAT 

QTY

PART NO.

1

VALVE, SHUT OFF, 3/4" NPT, BRASS

1

1

R10-143

2

FLOW SWITCH KIT

1

1

250S4030

3

WELL, IMMERSION, 1/2" NPT

1

1

RE2058300

4

SENSOR, TEMPERATURE

1

1

E2371200

5

NIPPLE, CLOSE, BLK, 3/4" NPT

1

-

P0014100

NIPPLE, 3/4 NPT, CLOSE, 316 SS

-

1

P2070700

6

PLUG, PIPE, 1/2 NPT,  HEX HEAD, SST 316 ASME

-

1

P2084800

PLUG, 1/2" STEEL

1

-

P2016000

7

PLUG, 2" NPT, 316 SS, CLASS 150

-

1

P2103300

PLUG, PIPE, 2" NPT, STEEL

1

-

P2109300

8

PLUG, 1/4" NPT, 316 SS, CLASS 150

-

1

P2104000

PLUG, HD.  1/4" NPT, SQ SOCKET, BLK

1

-

P2014200

9

GAUGE, TEMP/PRESSURE, 70°F MAX LO-320°F MIN HI, 0-230 PSI

1

1

30, 50, 60 psi - 

RA0079000

GAUGE, TEMP/PRESSURE, 70°F MAX LO-320°F MIN HI, 0-90 PSI

1

1

75, 125, 150 

psi - R0060600

PARTS LIST

ITEM  

NO.

DESCRIPTION

HYDRONIC   

QTY.

VOL WAT 

QTY

PART NO.

1

VALVE, SHUT OFF, 3/4" NPT, BRASS

1

1

R10-143

2

FLOW SWITCH KIT

1

1

250S4030

3

WELL, IMMERSION, 1/2" NPT

1

1

RE2058300

4

SENSOR, TEMPERATURE

1

1

E2371200

5

NIPPLE, CLOSE, BLK, 3/4" NPT

1

-

P0014100

NIPPLE, 3/4 NPT, CLOSE, 316 SS

-

1

P2070700

6

PLUG, PIPE, 1/2 NPT,  HEX HEAD, SST 316 ASME

-

1

P2084800

PLUG, 1/2" STEEL

1

-

P2016000

7

PLUG, 2" NPT, 316 SS, CLASS 150

-

1

P2103300

PLUG, PIPE, 2" NPT, STEEL

1

-

P2109300

8

PLUG, 1/4" NPT, 316 SS, CLASS 150

-

1

P2104000

PLUG, HD.  1/4" NPT, SQ SOCKET, BLK

1

-

P2014200

9

GAUGE, TEMP/PRESSURE, 70°F MAX LO-320°F MIN HI, 0-230 PSI

1

1

30, 50, 60 psi - 

RA0079000

GAUGE, TEMP/PRESSURE, 70°F MAX LO-320°F MIN HI, 0-90 PSI

1

1

75, 125, 150 

psi - R0060600

7

5

9

2

8

4

1

3

6

The

O

MNI

T

HERM

Summary of Contents for OMNITHERM ONH1250

Page 1: ...vous de bien suivres les instructions donn es dans cette notice pour r duire au minimum le risque d incendie ou d explosion ou pour viter tout dommage mat riel toute blessure ou la mort Ne pas entrepo...

Page 2: ...Headloss Data 4 A General Water Flow Information 24 4 B Boiler Water Flow Headloss Data 25 4 C Water Heater Flow and Headloss Data 25 4 D Recovery Data 26 SECTION 5 Piping 5 A Boiler Water Piping 26...

Page 3: ...About the Firmware of the touchscreen 86 8 E 12 Dev Fan 86 8 E 13 Fan Settings 86 8 F Messages and USB 87 8 F 1 Messages 87 8 F 2 USB Functionality 87 8 G Active Demands 88 SECTION 9 Gas Valve Touchsc...

Page 4: ...LAARS Heating Systems...

Page 5: ...si PRV C Alarm bell high limits D ONV 75psi PRV U ONV w H Stamp 150psi PRV D Auto manual K Gateway LONworks E ONH 125psi PRV 2 Flange kit ONV w H Stamp 30psi PRV high limits alarm bell F 150psi PRV 3...

Page 6: ...djust the outlet control limit or use temperature limiting valves to obtain a maximum water temperature of 125 F 52 C WARNING The inlet gas pressure to the unit must not exceed 13 W C 3 2kPa WARNING F...

Page 7: ...ice or repair work involving RCF without wearing the following protective gear 1 A National Institute for Occupational Safety and Health NIOSH approved respirator 2 Long sleeved loose tting clothing 3...

Page 8: ...del 1250 1500 OMT 1 5 1 25 5 20 5 48 4 11 5 12 17 7 58 6 2 39 12 62 26 7 24 24 5 66 10 3 21 6 Electrical Connections Air Inlet Vent 2 1 2 Inlet Cond Trap 2 1 2 Outlet Dims are in Inches 2 NPT Gas PRV...

Page 9: ...een Control Panel Power Pack Air Filter Box Manual Gas Valve Water Outlet Water Inlet Vent Condensate Trap Heat Exchanger Blower Gas Valve System Controls Touchscreen Power Connections Power Connectio...

Page 10: ...OMT 1 75 65 8 0 44 20 2 16 55 6 20 1 31 6 32 0 69 43 53 29 8 14 25 8 5 7 25 8 Electrical Connections Air Inlet Vent Cond Trap 3 Outlet 3 Inlet Dims are in Inches 2 NPT Gas PRV Gas Valve Reset Sight Gl...

Page 11: ...nual Gas Valve Manual Gas Valve Power Pack Control Panel Air Filter Box Gas Inlet Blower Gas Valve Water Outlet Water Inlet Vent Condensate Trap PRV Heat Exchanger System Controls Touchscreen Power Co...

Page 12: ...only 1 E 3 Models 2000 2500 OMT 2 0 2 5 60 32 0 78 0 42 8 53 DIMS ARE IN INCHES INLET O T 60 8 0 54 3 20 2 15 9 5 8 20 1 0 78 0 42 8 53 PRV 2 NPT Electrical Connections COND TRAP OUTLET 1 8 OR FLANGE...

Page 13: ...uchscreen Heat Exchanger Power Pack Air Filter Box Power Connections Manual Gas Valve System Controls Touchscreen Blower Water Outlet Water Inlet Vent Condensate Trap PRV Gas Valve Power Connections C...

Page 14: ...terminate through a wall and there is potential for snow accumulation in the local area both terminals should be installed at an appropriate level above grade or the maximum expected snow line The di...

Page 15: ...f all equipment located in the enclosure This opening must not be less than the sum of the areas of all vent connectors in the confined space Other methods of introducing combustion and ventilation ai...

Page 16: ...l but may not meet the requirements of every system Appliance needs to vent outdoors using approved vent caps and following all guidelines asnoted in the Installation and Operating manual Proper prote...

Page 17: ...Code ANSI Z223 1 or in Canada 2 B Category I Venting 2 B 1 Category I Vent Selkirk Duravent B vent B vent 90 elbow GVL90 45 elbow GVL45 Pipe GV Tee GVT Vert Termination GVDC Boiler adapter GVC Categor...

Page 18: ...est Boilers When an existing boiler is removed from a common venting system the common venting system is likely to be too large for proper venting of the appliances remaining connected to it At the ti...

Page 19: ...2000 D2012001 2500 D2012001 Horizontal terminations Size CA011901 CA011904 Table 8 Horizontal Vent and Air Terminations Change Diam and Length Notes added to bottom of table in a new NOTES section as...

Page 20: ...subject to damage by accident or vandalism It must be at least 7 feet 2 1 m above a public walkway 3 Locate the combustion air terminal so that it cannot be blocked by snow The National Fuel Gas Code...

Page 21: ...Note 5 See Note 5 r e n r o c e d i s n i o t e c n a r a e l C G H Clearance to each side of centerline extended above meter regulator assy 3 ft 91 cm within a height of 15 ft 4 6 m m c 1 9 t f 3 t...

Page 22: ...ng temperatures The unit must not operate if the outdoor temperature drops below 5F 15C WARNING The outdoor vent terminal gets hot This unit must be installed in such a way as to reduce the risk of bu...

Page 23: ...2 inch in size GAS VENT DIRECTLY BELOW KEEP CLEAR OF ALL OBSTRUCTIONS 4 Inspection The state or local gas inspector of the side wall horizontally vented gas fueled unit shall not approve the installat...

Page 24: ...1 650 3 370 6 100 Notes 400 546 870 1 540 3 140 5 680 1 Inlet pressure 11 0 in w c Notes 2 Pressure drop 0 5 in w c 1 Inlet pressure Less than 2 psi 3 Specific gravity 1 50 2 Pressure drop 0 5 in w c...

Page 25: ...ble 11 for water flow and boiler headloss based on heat exchanger temperature rise 4 C Water Heater Water Flow and Headloss Data Water flow and headloss for water heaters is based on the water s hardn...

Page 26: ...cm clearance to combustibles for all hot water pipes Suggested piping diagrams are shown in Figure 4 through Figure 7 These diagrams are meant only as guides Components required by local codes must be...

Page 27: ...temperatures are expected to be lower than 5 F 20 C glycol concentrations up to 50 can be used When concentrations greater than 35 are used water flow rates must be increased to maintain the desired...

Page 28: ...circuit System pump NOTE This drawing is a schematic representation of a piping style and is not intended to be used as a working installation drawing Local code requirements must be met 5 A 4 Sugges...

Page 29: ...k Anti scald mixing valve Domestic hot water out Cold water NOTE This drawing is a schematic representation of a piping style and is not intended to be used as a working installation drawing Local cod...

Page 30: ...ow of all the boilers Indirect DHW tank Anti scald mixing valve Domestic hot water out Cold water NOTE This drawing is a schematic representation of a piping style and is not intended to be used as a...

Page 31: ...oilers High temp space heating zone circuit 4 pipe dia max 4 pipe dia max 4 pipe dia max 4 pipe Dia Max Lead Lag Lag NOTE This drawing is a schematic representation of a piping style and is not intend...

Page 32: ...y the heater and system must be drained to avoid the risk of damage due to freezing Glycol must not be used in volume water heating applications NOTE This drawing is a schematic representation of a pi...

Page 33: ...aters Two Vertical Tanks NOTES 1 Optional CWMU recirculation line location 2 Locate NTV DHW sensor or remote aquastat well in lower 1 3 of tank 3 Back Flow Preventer may be required Check local codes...

Page 34: ...s responsibility CAUTION Label all wires prior to disconnection when servicing controls Wiringerrorscancauseimproperanddangerous operation Verifyproperoperationafteroperationservicing ATTENTION Au mo...

Page 35: ...is protected using an appropriate din rail mounted circuit breaker generates 120 volt single phase to power the 24 volt transformer The 120 volt and 24 volt outputs of either transformer are protected...

Page 36: ...CH2 DHW2 DHW DHW3 DHW DHW3 SPARE 1 SPARE 1 SPARE 2 SPARE 2 BAS 0 10VDC BAS 0 10VDC PUMP 0 10VDC PUMP 0 10VDC RUN C RUN N C RUN N O ALARM C ALARM N C ALARM N O CASCADE B CASCADE A CASCADE GND BMS B BM...

Page 37: ...mp functionality is configured using the touchscreen 7 E 3 Dry Contacts DHW Pump when connecting a domestic hot water DHW pump use terminals 19 and 20 As this is a dry contact the DHW pump supply volt...

Page 38: ...ontroller automatically detects the presence of this sensor and the temperature is shown on the home screen above the red system supply arrow When installed the unit controls the firing rate to mainta...

Page 39: ...the shield should be grounded at one end only preferably to earth ground It is not recommended to use a shield drain wire as the signal ground 7 E 11 RS 485 for Cascade Lead Lag This commercial unit...

Page 40: ...ss R W 18 Read Safety Chain Status Non safety Chain Status Demand source AI 20 Digital Output Status AI 21 Read Read AI 19 Read AI 18 Read Notes Map Descriptor Name BACnet Data BACnet Object Read Writ...

Page 41: ...0 LOW WATER CUT OFF ERROR 1 MANUAL RESET HIGH LIMIT ERROR 2 BLOCKED FLUE ERROR 3 HIGH GAS PRESSURE ERROR 4 LOW GAS PRESSURE ERROR 5 AUTO RESET HIGH LIMIT ERROR 6 SPARE SAFETY CHAIN ERROR 7 OUTLET PROB...

Page 42: ...ble 3 Running 4 Locked Out 71 Read Lag 3 Firing Rate AI 71 Read Current firing rate 0 100 72 Read Lag 4 State AI 72 Read 0 Not Present 1 Not Available 2 Available 3 Running 4 Locked Out 73 Read Lag 4...

Page 43: ...ime AI 56 Read Hours 64 Read Modulation Sensor AI 64 Read 0 None 1 Outlet 2 DHW 3 System 4 Inlet 5 Flue 6 System Return 65 Read Active Service AI 65 Read 66 Read Lag 1 State AI 66 Read 0 Not Present 1...

Page 44: ...URN SUPPLY SYSTEM SYSTEM DHW 29 30 27 28 32 31 33 DHW SYSTEM PUMP PUMP 21 22 20 19 BL W W BL R G BR BR Y BR G BR V O V MAIN POWER SWITCH 3 BK O 1 2 BK 4 BL Y W BK O G 120N GND GND 24V 24V 24V 24N 24N...

Page 45: ...00K t t t t FLUE A 100K RS485 BMS RS485 60 58 57 56 59 B A A W G V W BK 1 5 3 6 W V 7 4 8 Y R BR G W G Y G W G 8 PIN CONNECTOR C N C N O N C N O CONTACTS RUN RELAY ALARM RELAY CONTACTS 54 53 52 55 C B...

Page 46: ...SHALL NOT BE 1 8 DECIMALS XX TING SYSTEMS FINISH SH 3 8 19 DG 3 8 19 REVISIONS REV CHANGE APPR ENGR APPR ECN 010 PT AS SPECIFICALLY AUTHORIZED IN WRITING 17 152N 03 RR 3 8 19 INTENDED SIZE SOFTWARE DW...

Page 47: ...WRITING 17 152N 03 RR 3 7 19 SCALE NONE INTENDED SIZE SOFTWARE DWG NO C SHEET 1 OF 1 REV APPROVALS DRAFT ENGR APPR CHECK REPRODUCED TRANSFERRED TO OTHER DOCUMENTS USED OR DISCLOSED TO OTHERS FOR MANUF...

Page 48: ...BR PK L2 O V L3 Y TN GND G TO CONNECTOR X22 ON HARNESS E23815 BK O 1 DECIMALS XX E23824 A PROJECT D C B 1 FINISH NA 4 480 575 600V 3 OMT 2 5 EATING SYSTEMS REV DWG NO CHECK ECN SH A SH 3 7 19 DG 3 7...

Page 49: ...X4 11 X4 5 X9 3 X4 8 X4 14 X12 4 X4 17 TB1 18 X14 4 FLOW X14 3 X4 1 TB1 19 TB1 21 X14 8 ARHL SPARK X12 3 X4 7 X4 4 OPTIONAL GAS VALVE RELAY INTERLOCK GENERATOR X15 4 SPARK IGNITOR CONDENSATE HIGH GAS...

Page 50: ...28 ALARM BELL CONTACTS SENSOR INPUTS OUTPUTS Boiler N Pump L TB1 18 TB1 21 TB1 22 TB1 19 TB1 20 Pump System Pump DHW TB1 17 POWER OUTPUTS HIGH GAS PRESSURE CONDENSATE IGNITOR SPARK X15 4 GENERATOR REL...

Page 51: ...1 X1 13 2 1 Inlet FACTORY INSTALLED Dual Element 10k 20k 10k 20k X1 1 X1 3 X1 15 X1 1 X1 14 X1 2 Dual Element 4 3 2 1 Flue 1 2 3 4 HIGH GAS PRESSURE CONDENSATE IGNITOR SPARK X15 4 GENERATOR RELAY INTE...

Page 52: ...p L TB1 18 TB1 21 TB1 22 TB1 19 TB1 20 Pump System Pump DHW TB1 17 POWER OUTPUTS HIGH GAS PRESSURE CONDENSATE IGNITOR SPARK X15 4 GENERATOR RELAY INTERLOCK GAS VALVE OPTIONAL X4 4 X4 7 X12 3 SPARK ARH...

Page 53: ...Page 53 This page intentionally left blank The OMNITHERM...

Page 54: ...ges Will show an Exclamation Point when there is a message Clicking onto the Message icon will take you to the message itself The USB functionality will show the USB Icon at this location if being use...

Page 55: ...y allow you to set one or the other while some other screens example pump selection will allow you to select any or all of the options These windows will reflect the allowable ranges of the parameter...

Page 56: ...initial setup and commissioning Be aware that in this level of password protection changes to the configuration setup may result in lock outs or conflicts with your system setup resulting in technica...

Page 57: ...short Cycle Time Date 8 C 1 CH Central Heat CH stands for central heat It is used for space heating demands On the Quick Start Screen touch the CH thermometer icon to navigate to the CH Selection Scre...

Page 58: ...vigate to the CH2 Quick Start Screen touch the CH2 Icon on the CH Quick Start Selection Screen The CH2 screen will have the same look and functionality as the CH1 Screen 8 C 2 DHW Domestic Hot Water D...

Page 59: ...um Water Temperature The minimum boiler CH2 outlet temperature based on the Maximum Outdoor Temperature 8 C 4 Warm Weather Shut Down Warm weather shut down allows the user to disable the heating syste...

Page 60: ...is satisfied that the unit will wait to satisfy the next active heat demand NOTE Anti Short Cycle Time does not apply to DHW DHW3 heat demands 8 C 6 Time Date To navigate to the Time Date Quick Start...

Page 61: ...allows access to all parameters available based on the access level that is unlocked To navigate to the Configuration Screen touch the Configure Icon in the lower left portion of the Home Screen The C...

Page 62: ...Disable This allows CH1 to be enabled or disabled The default setting is Enabled Set Point This is the temperature set point for CH1 On Hysteresis The temperature at which the hysteresis will turn on...

Page 63: ...the corrective action that is proportional to the error set point control temperature Integral Time This value is applied to the sum of the error over a period of time Derivative Time This value is a...

Page 64: ...value the DHW heat demand will always be satisfied before swapping over to CH In order to use CH Timeout DHW Timeout must be a non zero value DHW CH Timeout DHW Timeout When there is both a DHW and C...

Page 65: ...t of the following parameters Enable Disable Enables and disables the outdoor reset functionality Maximum Outdoor Temperature The outdoor temperature at which the unit will use the minimum water tempe...

Page 66: ...navigation icons to configure the system for cascade operations These navigation icons are Cascade This icon navigates to the Cascade Parameters screen Rotation This icon navigates to the cascade rot...

Page 67: ...iler Internal Set Point this parameter is the maximum outlet temperature the local boiler heater is allowed to supply the system Lag On Hysteresis The value below the Max Lag Temp Max Lag Temp Lag On...

Page 68: ...cade Icon on the Configure Screen then touch the Rotation Icon on the Cascade Configuration Screen The Cascade Rotation Screen is a view only screen This screen indicates how many units are connected...

Page 69: ...nits will all ignite controlling to the Lost Lead Backup Set Point without an external call for heat This mode of operation will continue until communication with the lead unit is restored or until th...

Page 70: ...on automatically upon a call for heat Always On the pump will run continuously Disable the pump will not turn on upon a DHW heat demand DHW Pump Post Circulation This parameter is the amount of time...

Page 71: ...me This value is applied to the rate of change of the error Minimum Speed This is the minimum speed to which Vari Prime will control the pump Maximum Speed The is the maximum speed to which the Vari P...

Page 72: ...taller to initiate a digital heat demand eliminating the need for a physical heat demand This digital heat demand is treated as a local heat demand only This means that in a cascade system if the digi...

Page 73: ...Screen The Flue Limitation Parameters Screen allows adjustment of the following parameters Manual Reset Flue The temperature at which the unit will shut down due to exceeding a flue temperature manua...

Page 74: ...ntrol mode selected With Firing Rate control mode selected this is the minimum rate at which the boiler heater will run The unit of this parameter is so if the value of this parameter is 2000 or 20 00...

Page 75: ...t be lower than Demand Off to remove the heat demand With an active demand the unit will locate the set point according to the analog input signal Using the default values for Boiler Max Set Point 180...

Page 76: ...DHW heating demands Anti short Cycle To navigate to the Anti short Cycle Configuration Screen The higher the number the higher the priority it is assigned Warm Weather To navigate to the Warm Weather...

Page 77: ...touch the Anti Short Cycle Icon on the Miscellaneous Features screen The Anti Short Cycle Configuration Screen allows adjustment of the following parameter Cycle Time The amount of time after a heat...

Page 78: ...od The duration of time between heat demands that the boiler will wait before exercising the boiler DHW and system pumps There are three options for Warm Weather Shutdown WWSD WWSD is only applicable...

Page 79: ...on the Modbus network Timeout Upon loss of communication this is the duration of time in which the unit will wait prior to timeout conditions occurring With BACnet protocol selected the following par...

Page 80: ...inlet sensor reads the set point minus the hysteresis value It will leave anti frost mode at the set point plus the hysteresis value Hysteresis This parameter is a offset of the Anti Frost Set Point u...

Page 81: ...ouch the Lock Icon on any screen The Login Screen allows the operator to make parameter adjustments based on the level of the login credentials See Section 8 B on page 56 Table 17 on page 101 indicate...

Page 82: ...o navigate to the Service Screen touch the Service Icon in the lower left portion of the Home Screen SERVICE 8 E 1 Burner Enable Disable Available only to the factory or technician qualified at the OE...

Page 83: ...ght is green The indicator light associated with the input is red when the input is not satisfied For example if the blower is off the air proving switch is not satisfied and the air proving switch di...

Page 84: ...o screens associated with the Analog I O Analog I O Inputs Analog I O Outputs Analog I O Input There are three types of analog inputs temperature sensors flame signal and voltage current VDC mA Wiring...

Page 85: ...tion has ceased AutoLock Timeout allows the user to adjust the amount of time the touch screen will remain unlocked with no user interaction 8 E 5 History Navigate to the History Screen by touching th...

Page 86: ...s shown on the touch screen 8 E 7 Factory Reset Touching the Factory Reset Button on the Service Screen resets all touch screen adjustable parameters back to the factory default setting 8 E 8 HMI Mode...

Page 87: ...tings into a thumb drive for documentation purposes or copies these settings from unit to unit Upload Data from the boiler This is used to retrieve runtime data and history It captures all settings in...

Page 88: ...active heat demands A black heat demand icon indicates the heat demand that is currently being satisfied A grayed out heat demand icon is either lower in priority than the heat demand that is current...

Page 89: ...een Menus and Descriptions 9 A About the Gas Valve This unit utilizes a Honeywell Gas Valve with a touchscreen display Gas Valve Reset Sight Glass Gas Valve Reset Models 1250 and 1500 Sight Glass Mode...

Page 90: ...a USB device File types that can be saved or loaded include A F curve valve configuration data and log files Search for Valves If for some reason Valve 1 doesn t appear on the display may need to sear...

Page 91: ...lable Hi Gas Lo Gas Pressure Not available Fuel Air Ratio Ignition The sub menus found in Fuel Air Ratio Ignition allow for combustion setup ignition characteristics modification loading and saving A...

Page 92: ...k Security This menu allows the installer and OEM passwords to be reset if needed If the passwords are changed the installer building owner is responsible for remembering the password to gain access t...

Page 93: ...s can be used for troubleshooting From Setup Tests select Fuel Air Ratio Ignition MENU TABS Click back to Setup Tests 9 D Fuel Air Ratio Ignition Menus Fuel Air Ratio Ignition has several menus that a...

Page 94: ...l lockout When first installing the boiler and getting the boiler setup the record ign air level button should be selected so that the proper air level can be recorded for the application The settings...

Page 95: ...int commissioning 4 Adjust CO2 levels Touch the lean arrows to decrease CO2 Touch Rich arrows to increase CO2 Double arrows move the CO2 richer or leaner faster than single arrows In most cases touchi...

Page 96: ...llows for valve configurations A F curves and log files to be saved or loaded from system memory Saving the original A F curves to memory before starting to make adjustments will allow the installer t...

Page 97: ...rend The time scale and variables to monitor can be selected from pulldown menus Reports creates a report of all of the gas valve settings A F curves faults ignition settings and OEM settings that can...

Page 98: ...he Verify Safety Parameters button to proceed to the verification process 2 Select begin to start the verification process 3 Select yes if the parameter change is correct Select No if the parameter ch...

Page 99: ...Page 99 The OMNITHERM...

Page 100: ...ted parameter The login screen can also be accessed by pressing the login icon at the top of the gas valve display When entering a password select the installer tab and then enter the password LaarsOm...

Page 101: ...kup Mode Max Lag Power x x Rotation Mode x x Run Time Hours x x Time of Day Hour x x Time of Day Minutes x x Every X Day x x Loss of Lead Setup x x Hybrid Enable Disable x x Hybrid Lag Mode x x Hybrid...

Page 102: ...t x x x AutoLock Timeout x x x 0 F 60 F 20 F 2000 mV 10000 mV 10000mV 800 rpm 5400 rpm 800 rpm Vari Prime 180 190 195 190 210 195 30 secs Warm Weather Shutdown 50 F 140 F 90 F 50 F 140 F 95 F 4 F 11 F...

Page 103: ...Hysteresis x x Lag Off Hysteresis x x Maximum Lag Temperature x x Rotation Mode x x Run Time Hours x x Time of Day Hour x x Time of Day Minutes x x Every X Day x x Loss of Lead Setup x x Boiler Pump C...

Page 104: ...etpoint x x x DHW1 On Hysteresis x x DHW1 Off Hysteresis x x DHW1 PID Low Proportional Gain x x DHW1 PID Low Integral Time x x DHW1 PID Low Derivative Time x x DHW1 PID High Proportional Gain x x DHW1...

Page 105: ...t has been under water Immediately call a qualified service technician to inspect the unit and to replace any part of the control system and any gas control that may have been under water SECTION 11 I...

Page 106: ...the gas is turned off The ignition control will lockout c Open the gas shutoff valve Reset the boiler control by pressing the Reset button on the control Restart the unit The ignition sequence will s...

Page 107: ...ate for Boiler Firing Rate See Section 8 D 7 on page 72 A Service Video is available 11 E Combustion setup The OMNITHERM The OmniTherm uses a sophisticated gas control system that monitors the gas air...

Page 108: ...able when adjusting the CO2 e When the CO2 level is set correctly press set min if setting the min modulation point press set max if setting the maximum point or Add Generic if setting a point between...

Page 109: ...sconnecting them Wiring errors can cause improper and dangerous operation Verify proper operation after servicing WARNING Disconnect all power to the unit before attempting any service procedures Cont...

Page 110: ...to gain access to the top portion of the unit Remove the high tension ignition wire from the spark electrode Remove the flame sensor wire Remove the two 2 nuts and spacers holding the spark electrode...

Page 111: ...and into the longer condensate trap line which is being diverted into a separate container WARNING Failure to rinse the debris from the heat exchanger and temporary drain line may lead to clogged cond...

Page 112: ...high limit set point Auto Reset High Limit Outlet water temperature has exceeded the auto reset high limit setting Auto reset Condition Annunciation Warning High limit auto error on Message Screen Ver...

Page 113: ...ce of each element of the sensor and compare to the resistance table below Replace if necessary Temp F 10K 20K Resistance Resistance 68 12555 25099 86 8025 16057 104 5279 10569 122 3563 7139 140 2463...

Page 114: ...ary Burner Max Trials The maximum attempts for ignition has occurred without sensing flame Manual reset Condition Annunciation on Navigation Bar Verify supply and manifold gas pressures satisfy instal...

Page 115: ...0 140 60 24160 158 70 16870 176 80 12000 194 90 8674 212 100 6369 248 120 3581 284 140 2117 320 160 1307 356 180 839 392 200 558 428 220 382 464 240 269 500 260 194 536 280 143 Flow Switch Auto reset...

Page 116: ...t The Fuel Air Ratio stepper motor position has reached maximum open position during run mode This can happen if the inlet pressure is relatively low for the requested maximum gas volume Increase the...

Page 117: ...ription Detailed Description Remediation Steps Comments Fuel Air 43 FARMOD light off S2a level The Fuel Air Ratio Module S2a value was outside the commissioned window This can be caused by a change in...

Page 118: ...eached The Fuel Air Ratio Module redundant gas pressure signal was not within the control setpoint rough window within the specified time of 10 seconds This fault can occur independently or in combina...

Page 119: ...d N connections 5 If fault persists replace valve main electronics Page 8 of 13 Fault Category Fault Number Fault Description Detailed Description Remediation Steps Comments ILK 13 Valve Interlock Out...

Page 120: ...ove power and shut off gas supply as necessary 1 Remove valve front electrical and rear solenoid enclosures 2 Inspect internal wiring between solenoid proof of closure switch 1 and valve electronics T...

Page 121: ...ber Fault Description Detailed Description Remediation Steps Comments Security 95 Factory keys are corrupt Factory Key storage is corrupt Internal micro memory flash corrupted or factory initial key i...

Page 122: ...rain is MSOV closed piping flanges tight O ring leakage main electronics wiring and Pressure Module connection to it For wiring refer to the installation instructions 32 00018 Reset valve and repeat t...

Page 123: ...00 R2084600 4 Condensate Switch 40N2008 40N2008 40N2008 40N2008 40N2008 5 FARMod Filter R2084700 R2084700 R2084700 R2084700 R2084700 6 FARMod R2084800 R2084800 R2084800 R2084800 R2084800 Final Assembl...

Page 124: ...8 15 11 9 6 3 12 4 Parts List ITEM NO DESCRIPTION PART NUMBER 1 PANEL JACKET REAR 150S3005 2 PANEL ACCESS FLUE 150S302600 3 FILTER ASSY AIR INTAKE 150S2610 4 PANEL JACKET RIGHT 150S3006 5 PANEL JACKE...

Page 125: ...250S3004 9 PANEL JACKET TOP 300S3005 10 PANEL JACKET REAR 250S3001 11 PANEL ACCESS FLUE TOP 250S302402 250S302400 12 PANEL ACCESS FLUE BOTTOM 250S302502 250S302500 13 ACCESS PANEL 300S3013 14 DISPLAY...

Page 126: ...25S2141 1 150S2141 3 BLANKET INSULATION 1 1 150S2182 4 TEMPERATURE SENSOR 1 1 E2387700 5 VITAULIC COUPLING 2 2 P2101300 6 RFC TILE ASSY TOP 1 1 R2085600 7 RFC TILE ASSY BOTTOM 1 1 R2085700 Heat Exchan...

Page 127: ...C COUPLING 2 P2109800 1750 2500 6 PRV 30 PSI 1 A2124000 1750 2500 PRV 50 PSI 1 A2124005 PRV 60 PSI 1 A2124004 PRV 75 PSI 1 A2124009 PRV 125 PSI 1 A2124013 PRV 150 PSI 1 A2124014 7 RFC TILE ASSY TOP 1...

Page 128: ...88203 GAS VALVE REPLACEMENT CAT 1 3 1500 2 R2085100 O RING 3 1 R2004100 SWITCH LOW GAS PRESSURE 4 1 P2112100 FITTING ADAPTER 8mm TUBE TO 1 8 NPT 316 SST 5 1 KM008800 REGULATOR GAS 210E 2 X 2 MAXITROL...

Page 129: ...RATE 1 PARTS LIST 2 1 1 1 1 4 2 3 5 1 NOTES APPLY THREAD SEALANT TO ALL MALE 1 NPT THREADS BEFORE ASSEMBLY O RINGS INCLUDED WITH GAS VALVE 2 ITEM 6 FOR USE IN MASSACHUSETS 3 Gas Train Assembly Models...

Page 130: ...e R2083000 6 SCREW 10 32 x 1 2 SHCS ZINC F2057200 7 GASKET BURNER S2131100 8 O RING 3 16 5 7 8 ID EPDM 150S5010 9 BLOWER 120V MODELS A2124400 BLOWER 208 220 240V MODELS A2134400 10 O RING BLOWER OMT 3...

Page 131: ...KET BLOWER OUTLET FLANGE BLOWER 120V MODELS A2134500 A2134500 N A BLOWER 208 600V MODELS 8 O RING BLOWER 9A MIXER ASSY FRONT 9B MIXER ASSY REAR 10 FITTING ADAPTER 8mm TUBE TO 1 8 NPT 11 GASKET GAS MIX...

Page 132: ...8V Bill of Material ITEM NO DESCRIPTION PART NO 208V 1 QTY 220 240V 1 QTY 1 CIRCUIT BREAKER 7 AMP PANEL MOUNT E2378600 1 1 2 DIN RAIL ASSY 208 220 240V 1 300S731702 1 1 3 TRANSFORMER 208 X 416 PRIM 12...

Page 133: ...0S7403 WIRE HARNESS ASSY 480V 3 not shown 1 250S7404 WIRE HARNESS ASSY 575 600V 3 not shown 1 250S7405 5 1 3 2 4 6 7 8 AC Distribution Box Three Phase Model 2500 PARTS TABLE AC DISTRIBUTION BOX 3 MODE...

Page 134: ...RE 70 F MAX LO 320 F MIN HI 0 90 PSI 1 1 75 125 150 psi R0060600 9 BUSHING 1 1 4 NPT X 3 4 316 SS 1 1 P2072200 BUSHING 1 1 4 NPT X 1 NPT 316 SS 1 1 P2069000 10 NIPPLE PIPE 3 4 NPT CLOSE 316 SS 1 1 P20...

Page 135: ...PSI 1 1 30 50 60 psi RA0079000 GAUGE TEMP PRESSURE 70 F MAX LO 320 F MIN HI 0 90 PSI 1 1 75 125 150 psi R0060600 PARTS LIST ITEM NO DESCRIPTION HYDRONIC QTY VOL WAT QTY PART NO 1 VALVE SHUT OFF 3 4 NP...

Page 136: ...ifications subject to change without notice in accordance with our policy of continuous product improvement HLW Notes H2376700B Customer Service and Product Support 800 900 9276 Fax 800 559 1583 Headq...

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