Laars LMH Installation And Operation Instructions Manual Download Page 26 | Manualshive

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Laars LMH Installation And Operation Instructions Manual Download Page 26

LAARS Heating Systems

Page 24

Figure 21. Ladder Diagram.

b. If there are more boilers in the system connect a

wire from Modbus port 1 terminal A of boiler 2 to

Modbus port 1 terminal A of boiler 3.

c. Repeat these steps until all Modbus port 1 terminal

A connections are wired.

d. Repeat the above steps for Modbus port 1 terminal

B and C connections to complete the wiring.

e. Connect the drain wire from the twisted pair wire

to ground on one end of the wire only.

7.10 Wiring Diagrams

(see

Figures 21-22)

Caution

Label all wires prior to disconnection when servicing

controls. Wiring errors can cause improper and

dangerous operation. Verify proper operation after

servicing

Figure 20. System Pump Connections on Control Panel.

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Summary of Contents for LMH

Page 1: ...de gas in flue gases which could cause serious injury property damage or death Improper installation and or operation will void the warranty AVERTISSEMENT Assurez vous de bien suivres les instructions...

Page 2: ...Pump Capacity 15 SECTION 6 Water Connections 6 1 Central Heat System Piping 15 6 2 Cold Water Make Up 15 6 3 Freeze Protection 16 6 4 Suggested Piping Schematics 17 6 5 Recognized Chemicals 17 6 6 Dom...

Page 3: ...after Set Up 30 10 2 1 Burner Operation 30 10 2 2 Boiler Setup and Adjustment 31 10 2 3 Manifold Pressure Check 31 10 3 Shutting Down Mascot II 31 10 4 To Restart Mascot II 31 SECTION 11 Maintenance...

Page 4: ...equired by the authority having jurisdiction the installation of Mascot II boilers must conform to the Standard for Controls and Safety Devices for Automatically Fired Boilers ANSI ASME CSD 1 Any modi...

Page 5: ...appliances are covered by a limited warranty The owner should complete the warranty registration at www Laars com All warranty claims must be made to an authorized LAARS Heating Systems representative...

Page 6: ...ng Package 1 PRV 30 PSI 5 Exhaust terminal assy 2 PRV Pipe w washer 6 Air intake terminal assy 3 Wall attach bracket 7 Ball valve 4 Outdoor sensor 8 System sensor not shown 9 Flow restrictor not shown...

Page 7: ...eaters Page 5 Figure 3 Dimensional Drawing Cond Hydronic DHW 2nd Gas Hydronic DHW 2nd Outlet Return Inlet Return Supply Supply Outlet Supply 3 4 3 4 1 2 3 4 1 2 3 4 1 2 3 4 PVC copper NPT copper NPT N...

Page 8: ...choosing the locations for the appliance 2 2 Locating Appliance for Correct Vent Distance from Outside Wall or Roof Termination The forced draft combustion air blower in the appliance has sufficient...

Page 9: ...commended Closet installations require minimum air ventilation see Section 3 Note Mascot II bracket and wall bracket are purposely offset NOTE Mascot II models include 16 on center mounting holes on u...

Page 10: ...Provide adequate hangers The unit must not support the weight of the combustion air intake pipe Maximum linear pipe length allowed is shown in Table 2 Subtract 5 allowable linear ft 1 5m for every el...

Page 11: ...Gas vents connected to the Mascot II plastic stainless steel or otherwise must be certified to this ULC standard Appropriate selection of vent material is very important for proper performance and saf...

Page 12: ...s the vent pipe may be used The tee d vent termination offers greater protection from wind related operating issues 3 3 2 Side Wall Combustion Air Terminal The LAARS side wall combustion air terminal...

Page 13: ...4 3 feet 91 cm J Clearance to nonmechanical air supply Direct vent only 12 30cm 80 285 36 91cm inlet to building or the combustion air inlet 399 850 Other than Direct vent 4 ft 1 2m below 36 inches 91...

Page 14: ...8 feet above grade directly in line with the exhaust vent terminal for horizontally vented gas fueled heating appliance or equipment The sign shall read in print no less than one half 1 2 inch in siz...

Page 15: ...when tested as outlined above return doors windows exhaust fans fireplace dampers and any other gas burning appliance to their previous conditions of use 7 Any improper operation of the common venting...

Page 16: ...ing plate Mascot II will function properly without the use of high altitude modification at elevations up to 10 000 feet 3050 m 2 The maximum inlet gas pressure must not exceed 13 W C 3 2kPa The minim...

Page 17: ...ydraulic separator The pump is sized for a maximum of 30 feet 9 1m of piping and the headloss of the boiler only For custom configurations the available pump head is provided in Figure 11 The system d...

Page 18: ...zes it expands which may result in bursting of pipes or damage to the boiler which could result in leaking or flooding conditions Do not use automotive antifreeze or ethylene glycol To help prevent fr...

Page 19: ...point is made via aquastat located on the indirect water heater or can be controlled at the boiler via a remote sensor 6 7 Condensate Drain A condensate drain trap is built into the Mascot II Connect...

Page 20: ...3 42 38 15 33 31 28 Table 8 DHW and Pump Performance Data Caution Scalding Risk Laars recommends the use of a thermostatic mixing valve at domestic hot water outlet boiler location to reduce potential...

Page 21: ...Mascot II Boilers and Water Heaters Page 19 Figure 16 Hydronic Piping Multi boilers for large homes with long multiple baseboard zones Installer to provide DHW anti scald thermostatic mixing valve...

Page 22: ...LAARS Heating Systems Page 20 Figure 17 Hydronic Piping Multi boilers for large homes with long multiple radiant zones Installer to provide DHW anti scald thermostatic mixing valve...

Page 23: ...Mascot II Boilers and Water Heaters Page 21 Figure 18 Hydronic Piping Heating zones piped with zone pumps Installer to provide DHW anti scald thermostatic mixing valve...

Page 24: ...LAARS Heating Systems Page 22 Figure 19 Hydronic Piping Heating zones piped with zone valves Installer to provide DHW anti scald thermostatic mixing valve...

Page 25: ...iagram s 7 1 Main Power Plug power cord into a non switched 115V electrical outlet with 15A circuit protection FLA is 2A There is an internal 10A breaker to protect internal system components 7 2 Pump...

Page 26: ...ions are wired d Repeat the above steps for Modbus port 1 terminal B and C connections to complete the wiring e Connect the drain wire from the twisted pair wire to ground on one end of the wire only...

Page 27: ...6 1 2 3 4 5 4 5 6 6 1 2 3 Y J8B 1 TERM STRIP R G BK 1 3 1 4 2 5 6 BK BK BR BL 1 6 5 4 3 2 J4B Y DRY CONTACT 7A GR R C OPTIONAL R20729 O BLOCKED VENT SWITCH COM NC POWER PLUG 115V BLOWER 3 1 5 1 G POW...

Page 28: ...reset HOD High outdoor temperature setpoint LOD Low outdoor temperature setpoint RMT Add Used for Lead Lag follow menus LL Lead Lag enable disable enables menu items HS Hysteresis temp range between...

Page 29: ...The stack temperature is a dual thermistor sensor and is limit rated The control compares each of the temperature readings to determine accuracy The stack sensor is used as a limiting feature to avoi...

Page 30: ...r air temperature reaches the low outdoor temperature setpoint LOD the control setpoint is adjusted to the CH Outlet water setpoint temperature HOD LOD and LBT can be adjusted by accessing SETUP mode...

Page 31: ...multaneously drop their firing rate If when reaching the point where both boilers drop toward their minimum firing rate 20 then the first slave will drop out Slave1 will remain unavailable until its A...

Page 32: ...Start Up Shut Down Instruction Decal located on the back of the Top Front Cover and turn on gas and electrical power to appliance SECTION 10 Set Up Instructions 10 1 Filling the Boiler System 1 Ensure...

Page 33: ...s the forced rate menu CO2 readings should be between the range shown in Table 13 If the CO2 is not within the range shown adjustments may be made To adjust the low fire CO2 locate the low fire adjust...

Page 34: ...l 8 8 __ 9 8 3 5 __ 4 5 Propane 9 8 __ 10 8 3 5 __ 4 5 Table 13 CO2 Range and Pressure Settings Figure 25 Adjustment Screws and Settings for CO2 Manifold Pressure Screw under cap High fire setting Low...

Page 35: ...the blower arm assembly to access the burner Remove the 4 bolts connecting the blower to the arm see Figure 32 Remove the 5 bolts which hold the burner arm in place Pull burner up and out Clean burne...

Page 36: ...the boiler 2 Turn off all manual gas valves connecting the boiler to the main gas supply line 3 Remove the four bolts connecting the blower flange to the burner door arm 4 Remove the nuts located on t...

Page 37: ...l front covers SECTION 12 Trouble Shooting 12 1 Sequence of Operation Mascot II is a cold start appliance that should start only on a call for heat from a tank aquastat room thermostat zone valve end...

Page 38: ...3 DHW sensor fault Faulty sensor or wiring Check wiring replace sensor condition can be 95 Stack sensor fault caused by short 96 OAT temperature sensor fault Faulty outdoor air Check wiring and sensor...

Page 39: ...a difference greater than 22 F 12 C 255 CH setpoint minus ODR Increase Outdoor water min water temperature was temperature min and max too small min 12 C 22 F values to a difference greater Increase s...

Page 40: ...replacement parts 13 1 General Information To order or purchase parts for the LAARS Mascot II contact your nearest LAARS dealer or distributor If they cannot supply you with what you need contact Cust...

Page 41: ...1 4 npt E2337500 8O Exchanger heat plate 8P Tie cable 14 3 4 long x 0 31 wide heat stabilized F2029100 8Q Flow switch water E2337400 8R Pipe tailpiece 1 npt M x 3 4 tube cu 12H4023 8S O ring 120 1 ID...

Page 42: ...LAARS Heating Systems Page 40 Figure 28 Panel Assembly Door Top...

Page 43: ...Mascot II Boilers and Water Heaters Page 41 Figure 29 Panel Assembly Door Middle...

Page 44: ...LAARS Heating Systems Page 42 Figure 30 Panel Assembly Door Bottom...

Page 45: ...Mascot II Boilers and Water Heaters Page 43 Figure 31 Base Jacket Assembly...

Page 46: ...LAARS Heating Systems Page 44 Figure 32 Heat Exchanger Cabinet Fan...

Page 47: ...Mascot II Boilers and Water Heaters Page 45 Figure 33 Heat Exchanger Burner Components...

Page 48: ...LAARS Heating Systems Page 46 Figure 34 Pump Assembly Components...

Page 49: ...Mascot II Boilers and Water Heaters Page 47 Figure 35 Plumbing Components...

Page 50: ...LAARS Heating Systems Page 48...

Page 51: ...Mascot II Boilers and Water Heaters Page 49...

Page 52: ...Fax 603 335 3355 Applications Engineering 1869 Sismet Road Mississauga Ontario Canada L4W 1W8 905 238 0100 Fax 905 366 0130 www Laars com Litho in U S A Laars Heating Systems 1301 Document 1230C Dime...

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