Laars Rheos RHCH Installation And Operation Instructions Manual
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Laars Rheos RHCH Installation And Operation Instructions Manual

Modulating boiler; modulating water heater
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Installation and Operation Instructions
FOR YOUR SAFETY: This product must be installed and serviced by a professional service technician,
qualified in hot water boiler installation and maintenance. Improper installation and/or operation could
create carbon monoxide gas in flue gases which could cause serious injury, property damage, or death.
Improper installation and/or operation will void the warranty.
WARNING
If the information in this manual is not
followed exactly, a fire or explosion may
result causing property damage, personal
injury or loss of life.
Do not store or use gasoline or other
flammable vapors and liquids in the vicinity
of this or any other appliance.
WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electrical switch; do not
use any phone in your building.
• Immediately call your gas supplier from a
nearby phone. Follow the gas supplier's
instructions.
• If you cannot reach your gas supplier, call
the fire department.
Installation and service must be performed
by a qualified installer, service agency, or gas
supplier.
Installation and Operation
Instructions for
Rheos
TM
Modulating Boiler
Model RHCH
Modulating Water Heater
Model RHCV
U.S. Patent No. 6,644,393
Canada Patent Pending
AVERTISSEMENT
Assurez-vous de bien suivres les instructions
données dans cette notice pour réduire au
minimum le risque d'incendie ou d'explosion
ou pour éviter tout dommage matériel, toute
blessure ou la mort.
Ne pas entreposer ni utiliser d'essence ni
d'autres vapeurs ou liquides inflammables dans
le voisinage de cet appareil ou de tout autre
appareil.
QUE FAIRE SI VOUS SENTEZ UNE ODEUR DE GAZ:
• Ne pas tenter d'allumer d'appareils.
• Ne touchez à aucun interrupteur. Ne pas vous
servir des téléphones dansle bâtiment où vous
vous trouvez.
• Appelez immédiatement votre fournisseur de
gaz depuis un voisin. Suivez les instructions
du fournisseur.
• Si vous ne pouvez rejoindre le fournisseur de
gaz, appelez le sservice des incendies.
L'installation et l'entretien doivent être assurés par
un installateur ou un service d'entretien qualifié ou
par le fournisseur de gaz.
Document 1170F

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  • Page 1 Installation and Operation Instructions Document 1170F Installation and Operation Instructions for Rheos Modulating Boiler Model RHCH Modulating Water Heater Model RHCV U.S. Patent No. 6,644,393 Canada Patent Pending FOR YOUR SAFETY: This product must be installed and serviced by a professional service technician, qualified in hot water boiler installation and maintenance.

  • Page 2: Table Of Contents

    LAARS Heating Systems Page 2 TABLE OF CONTENTS 5.5.1 Temperature Setpoint ........24 SECTION 1. 5.5.2 Differential Setting ..........24 General Information 5.5.3 Offset ............... 24 1.1 Introduction ............3 5.5.4 Throttling Range ..........24 1.2 Model Identification ..........3 5.5.5 Minimum Output Setting ........

  • Page 3: General Information

    Such applicable in this manual, or the Laars Heating Systems requirements take precedence over the general warranty will be voided. The installation must instructions contained herein.

  • Page 4: Warranty

    Laars Heating Systems’ Rheos appliances are P = Liquid Propane covered by a limited warranty. The owner should fill (10) Altitude out the warranty registration card and return it to Laars A = Universal Altitude (0' to 10,000') (0m to 3050m) Heating Systems. (11) Location...
  • Page 5 Rheos Boiler and Water Heater Page 5 "P" WATER INLET PUMP-MOUNTED UNIT "G" GAS CONNECTION "V" FLUE VENT (CAT. IV) OUTLET "S" WATER OUTLET "A" AIR INLET "W" WATER INLET WITH AIR FILTER NON-PUMP-MOUNTED UNIT 65.75 30.5 7.75 34.5 17.25 3.75 Dimensions shown in inches cm.

  • Page 6: Outdoor Installations

    LAARS Heating Systems Page 6 1.5 Outdoor Installations The dimensions and requirements that are shown in Table 2 should be met when choosing the locations Attach the appropriate termination and appliance for the appliance: adaptor to the vent outlet (see Table 1). Units are...

  • Page 7: Venting And Combustion Air

    When taken from the wall, it A Rheos unit can take combustion air from the must be taken from out-of-doors by means of the Laars space in which it is installed, or the combustion air can horizontal wall terminal, shown in Table 4.
  • Page 8 LAARS Heating Systems Page 8 U.S. Installations (see note 1) Canadian Installations (see note 2) A= Clearance above grade, veranda, porch, 12 inches (30 cm) 12 inches (30 cm) deck, or balcony B= Clearance to window or door that may be 4 feet (1.2 m) below or to side of opening;...

  • Page 9: Venting

    UL 1738 Standard (see Table 2.3.1 Side Wall Vent Terminal 6). It must be installed per this installation manual The appropriate Laars side wall vent hood must and the venting system manufacturer’s Installation be used, and is listed in the installation and operation Instructions.
  • Page 10 LAARS Heating Systems Page 10 Locate the vent terminal so that vent gases cannot an alarm and battery back-up is installed on be drawn into air conditioning system inlets. the floor level where the gas equipment is to be Locate the vent terminal so that vent gases cannot installed.

  • Page 11: Side Wall Combustion Air Terminal

    2.3.2 Side Wall Combustion Air Terminal fueled equipment installed in a room or structure The Laars side wall combustion air terminal (see separate from the dwelling, building or structure Table 4) must be used when the heater takes air from a used in whole or in part for residential purposes.
  • Page 12 LAARS Heating Systems Page 12 OPTIONAL PUMP MOUNTED UNIT AVAILABLE COLD WATER BOILER CIRC. MAKE-UP PUMP SYSTEM SYSTEM SUPPLY RETURN SYSTEM PUMP LEGEND EXPANSION TANK PRIMARY/SECONDARY MANDITORY FOR ALL BOILER CIRCUIT PIPING MUST BE EQUAL TO VARIABLE FLOW SYSTEMS BOILER WATER CONNECTION SIZE...
  • Page 13 Rheos Boiler and Water Heater Page 13 Temperature Rise in Degrees (°F/°C) 20°F 11°C 25°F 14°C 30°F 17°C Model Flow Flow Flow Flow Flow Flow (Size) feet feet feet 1200 1600 2000 2400 NOTE: Maximum temperature rise is 30°F (17°C), as shown. Headloss is for boiler’s heat exchanger only. Table 8.
  • Page 14 LAARS Heating Systems Page 14 OPTIONAL PUMP MOUNTED UNIT AVALIABLE BOILER CIRC. PUMP COLD WATER MAKE-UP SYSTEM SUPPLY SYSTEM RETURN SYSTEM PUMP LEGEND EXPANSION TANK PRIMARY/SECONDARY MANDITORY FOR ALL BOILER CIRCUIT PIPING MUST BE EQUAL TO VARIABLE FLOW SYSTEMS BOILER WATER CONNECTION SIZE...

  • Page 15: Vertical Combustion Air Terminal

    Verify that the appliance is fitted for the proper condition. type of gas by checking the rating plate. Laars Insofar as it is practical, close all building doors Heating Systems appliances are normally equipped and windows and all doors between the space in to operate at elevations up to 2000 feet (610m).
  • Page 16 LAARS Heating Systems Page 16 KEY: WATER CATEGORY GRAIN HARDNESS PER GALLON S = SOFT 1 THROUGH 7.5 N = NORMAL 7.6 THROUGH 17 H = HARD OVER 18 17.1 PARTS PER MILLION = 1 GRAIN HARDNESS PER GALLON CAUTION: THIS DRAWING SHOWS SUGGESTED...
  • Page 17 Rheos Boiler and Water Heater Page 17 KEY: WATER CATEGORY GRAIN HARDNESS PER GALLON S = SOFT 1 THROUGH 7.5 N = NORMAL 7.6 THROUGH 17 H = HARD OVER 18 17.1 PARTS PER MILLION = 1 GRAIN HARDNESS PER GALLON CAUTION: THIS DRAWING SHOWS SUGGESTED PIPING CONFIGURATION AND VALVING CHECK WITH LOCAL CODES AND ORDINANCES FOR...

  • Page 18: Section 4A

    LAARS Heating Systems Page 18 Run gas supply line in accordance with all NOTE: This appliance must be installed in a closed applicable codes. pressure system with a minimum of 12 psi (82.7kPa) Note: If you have a boiler/water heater with a static pressure at the boiler.

  • Page 19: Freeze Protection - Boiler

    Rheos Boiler and Water Heater Page 19 Increase the head loss requirement by 20%. Setpoint Adjustment IMPORTANT NOTES: Different glycol products Dial may provide varying degrees of protection. Glycol products must be maintained properly in a heating system, or they may become ineffective. Consult the Module Connector glycol specifications, or the glycol manufacturer, for...

  • Page 20: Water Flow Requirements - Water Heater

    For extremely soft or hard water, cupro-nickel tubes are available. Contact a Laars 4B.5 Freeze Protection – Water Heater Representative if you have questions or concerns about Although Rheos water heaters are design- water quality.

  • Page 21: Electrical Connections

    Rheos Boiler and Water Heater Page 21 neutral to the 120V neutral circuit of the unit.) SECTION 5. If the pump is 3-phase, higher voltage than 120V, Electrical Connections or higher horsepower than 1hP, the pump’s starter or a separate relay can be connected to the unit’s pump time delay relay, and the pump can be driven WARNING indirectly.

  • Page 22: Internal Water Heater Temperature Control

    LAARS Heating Systems Page 22 through the heater is 25°F, the outlet temperature will Caution be 175°F (150°F+25°F). Therefore, set the manual Should overheating occur or the gas supply fail to reset high limit to 195°F (175°F + 20°F). shut off, turn off the manual gas control valve to the Example, Metric units: If the tank temperature appliance.
  • Page 23 Rheos Boiler and Water Heater Page 23 Figure 16. Control Parameter Possible Interference. Figure 17. Control Parameter Possible Interference.

  • Page 24: Temperature Setpoint

    LAARS Heating Systems Page 24 the throttling range will cause the Rheos to modulate 5.5.1 Temperature Setpoint between 50% and 100% of full fire between 175°F and The temperature setpoint is the point at which the temperature control relay will be de-energized and the 165°F.

  • Page 25: External Control Connections

    Rheos Boiler and Water Heater Page 25 sluggish with the control set to medium, the “Fast” 5.7 Wiring Diagrams setting may be an improvement. The “Fast” setting will only be used when the rate of change at the sensor Caution is very rapid.
  • Page 26 LAARS Heating Systems Page 26 Figure 18. Wiring Diagram, Model 1200, Standard and Codes A, C, D, F and G.
  • Page 27 Rheos Boiler and Water Heater Page 27 Figure 19. Wiring Diagram, Models 1600, 2000 and 2400, Standard and Codes A, C, D, F and G.
  • Page 28 LAARS Heating Systems Page 28 Figure 20. Wiring Diagram, Model 1200, Codes B and E.
  • Page 29 Rheos Boiler and Water Heater Page 29 Figure 21. Wiring Diagram, Models 1600, 2000 and 2400, Codes B and E.
  • Page 30 LAARS Heating Systems Page 30 Figure 22. Wiring Diagram, Model 1200, Pump-Mounted, Standard and Codes A, C, D, F and G.
  • Page 31 Rheos Boiler and Water Heater Page 31 Figure 23. Wiring Diagram, Models 1600, 2000 and 2400, Pump-Mounted, Standard and Codes A, C, D, F and G.
  • Page 32 LAARS Heating Systems Page 32 Figure 24. Wiring Diagram, Model 1200, Pump-Mounted, Codes B and E.
  • Page 33 Rheos Boiler and Water Heater Page 33 Figure 25. Wiring Diagram, Models 1600, 2000 and 2400, Pump-Mounted, Codes B and E.
  • Page 34 LAARS Heating Systems Page 34 Schematic Wiring Diagram Schematic Wiring Diagram Figure 26. Wiring Schematic, Model 1200, Standard and Figure 27. Wiring Schematic, Models 1600, 2000 and Codes A, C, D, F and G. 2400, Standard and Codes A, C, D, F and G.
  • Page 35 Rheos Boiler and Water Heater Page 35 Schematic Wiring Diagram Schematic Wiring Diagram Figure 28. Wiring Schematic, Model 1200, Codes B Figure 29. Wiring Schematic, Models 1600, 2000 and and E. 2400, Codes B and E.
  • Page 36 LAARS Heating Systems Page 36 Schematic Wiring Diagram Schematic Wiring Diagram Figure 30. Wiring Schematic, Model 1200, Pump-Mount- Figure 31. Wiring Schematic, Models 1600, 2000 and ed, Standard and Codes A, C, D, F and G. 2400, Pump-Mounted Standard and Codes A, C, D, F...
  • Page 37 Rheos Boiler and Water Heater Page 37 Schematic Wiring Diagram Schematic Wiring Diagram Figure 32. Wiring Schematic, Model 1200, Pump-Mount- Figure 33. Wiring Schematic, Models 1600, 2000 and ed, Codes B and E. 2400, Pump-Mounted Codes B and E.

  • Page 38: Operating Instructions

    LAARS Heating Systems Page 38 SECTION 6. for heat. Main gas terminals will be energized, attempting to light, for seven (7) seconds, and Operating Instructions then will de-energize. The unit will go into lockout mode. Second, turn the power off, press 6.1 Filling the Boiler System...
  • Page 39 Rheos Boiler and Water Heater Page 39 Switch on the appliance power switch located on the front of the unit. The Rheos will enter the start sequence. The blower and pump come on for pre-purge, then the ignitor warm-up sequence starts and after all safety devices are verified, the gas valve opens.

  • Page 40: Shutting Down The Rheos

    7.2 Appliance Maintenance and Burner will go through a prepurge period and Component Description ignitor warm-up period, followed by ignition. Only genuine Laars replacement parts should be used. Caution Label all wires prior to disconnection when servicing controls. Wiring errors can cause improper and dangerous operation.

  • Page 41: Burner

    Rheos Boiler and Water Heater Page 41 See Figures 36, 37 and 38 for location of gas determined the actuator is working properly, the gas train and control components. valve body may need to be replaced. To remove the The gas and electric controls on the appliance gas valve body, shut off 120-volt power and the gas are engineered for long life and dependable operation, shutoff valve.

  • Page 42: Ignitor / Flame Sensor Assembly

    If the tubes show signs of scaling, clean the internal surface. Laars offers a tube 7.2.11 Flow Switch cleaning kit part number R2000700. The Rheos uses a paddle-type flow switch to 11.

  • Page 43: Normally Open Vent Valve

    Rheos Boiler and Water Heater Page 43 Standard and Control Pack C Gas Train Air Inlet Modulating Gas High Gas Transition Valve Actuator Pressure Switch Safety Gas Valve Manual Gas Valve Pressure Switch Low Gas Pressure Manual Switch Gas Valve Modulating Gas Gas Orifice Valve Body...

  • Page 44: Gas Pressure Switches

    LAARS Heating Systems Page 44 Control Packs B and E Gas Trains Modulating Gas Valve Actuator Modulating Gas Valve Actuator High Gas Pressure Switch On/Off Gas High Gas On/Off Gas Valve Actuator Pressure Switch Valve Actuator Pressure Low Gas Pressure...

  • Page 45: Trouble Shooting

    Rheos Boiler and Water Heater Page 45 SECTION 8. correct, reset the boiler and check for 120 VAC at the ignitor plug during the start cycle. If there Trouble Shooting is no voltage, replace the faulty ignitor wire harness. 8.1 Sequence of Operation Inadequate combustion air: If the boiler goes The Rheos appliance is a cold start appliance through a normal ignition cycle, and shuts off...

  • Page 46: Defective Burner - Occurs On Startup Or At Burner Shutdown

    9.1 General Information there is a reduction in heating load, short cycling is To order or purchase parts for the Laars Rheos, greatly reduced. If the heating load drops below the contact your nearest Laars dealer or distributor. If...

  • Page 47: Parts List

    Rheos Boiler and Water Heater Page 47 9.2 Parts List COMBUSTION COMPONENTS 1200 1600 2000 2400 See Figure 39 Combustion chamber assembly R2010800 R2016300 R2016400 R2001000 Base assembly R2001100 R2001100 R2001100 R2001100 Panel, front cover, base frame R2001200 R2001200 R2001200 R2001200 Panel, top, combustion chamber (with insulation) R2001300...
  • Page 48 LAARS Heating Systems Page 48 1200 1600 2000 2400 Pressure switch, low gas R2004100 R2004100 R2004100 R2004100 Tubing/Fittings (gas train repair kit) R2020700 R2020700 R2020700 R2020700 Air filter box assembly (with gasket and hardware) Nat R2020800 R2020900 R2004400 R2004400 Air filter box assembly (with gasket and hardware) LP...
  • Page 49 Rheos Boiler and Water Heater Page 49 1200 1600 2000 2400 Panel, diagnostic lights R2007300 R2007300 R2007300 R2007300 Bracket, mounting, diagnostic panel R2007400 R2007400 R2007400 R2007400 Standoff R2007500 R2007500 R2007500 R2007500 Hardware kit, control panel R2007600 R2007600 R2007600 R2007600 Bracket, support, control panel top R2007800 R2007800 R2007800...
  • Page 50 LAARS Heating Systems Page 50 18 OR 19 18 OR 19 18 OR 19 2 (ASSEMBLY) 1 - Complete Combustion Component Assembly 11 - Hardware Kit, Combustion Chamber Figure 39. Combustion Components.
  • Page 51 Rheos Boiler and Water Heater Page 51 Figure 40. Gas Train/Combustion Air Components.
  • Page 52 LAARS Heating Systems Page 52 28 OR 30 Standard and Control Pack C Gas Train 29 OR 30 36 OR 37 28 OR 30 Control Packs A and D Gas Train 36 OR 37 29 OR 30 28 OR 30...
  • Page 53 Rheos Boiler and Water Heater Page 53 Figure 42. Electrical Components.
  • Page 54 LAARS Heating Systems Page 54 107 OR 109 106 OR 108 Figure 43. Heat Exchanger / Water Path Components.
  • Page 55 Rheos Boiler and Water Heater Page 55 132 - Jacket Hardware Kit 136 - Jacket Retro-fit Kit (standard) 137 - Jacket Retro-fit Kit (mounted pump) Figure 44. Jacket Components.

  • Page 56: Tables Listing

    LAARS Heating Systems Page 56 Tables Listing Figure 19 Wiring Diagram, Models 1600, 2000 and 2400, Standard and Codes A, C,E, F and G ..... 27 Figure 20 Wiring Diagram Model 1200, Table 1 Terminals for Outdoor Installation...... 6 Codes B and E ..........28 Table 2 Clearances ............6...
  • Page 57 Rheos Boiler and Water Heater Page 57...
  • Page 58 LAARS Heating Systems Page 58...
  • Page 59 Rheos Boiler and Water Heater Page 59...
  • Page 60 800.900.9276 • Fax 800.559.1583 (Customer Service, Service Advisors) 20 Industrial Way, Rochester, NH 03867 • 603.335.6300 • 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 1010 Document 1170F...

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