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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 and heater 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.
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.
WARNING
Installation and
Operation Instructions for
with Touchscreen
Modulating Boilers and
Volume Water Heaters
Indoor and Outdoor
Sizes 399 – 850 MBTU/h
NTH
Sizes 150 – 850 MBTU/h
NTV
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 êtes.
• 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 1330J
®
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Summary of Contents for Laars Neotherm NTH
- Page 1 Installation and Operation Instructions Document 1330J Installation and Operation Instructions for ® with Touchscreen Modulating Boilers and Volume Water Heaters Indoor and Outdoor Sizes 399 – 850 MBTU/h Sizes 150 – 850 MBTU/h FOR YOUR SAFETY: This product must be installed and serviced by a professional service technician, qualified in hot water boiler and heater installation and maintenance.
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Page 2: Table Of Contents
LAARS Heating Systems Table of Contents SECTION 6 SECTION 1 WATER CONNECTIONS GENERAL INFORMATION Introduction ............5 Boiler ............. 34 Warranty ............5 6.A.1 Boiler Water Piping ........34 Model Identification ........... 5 6.A.2 Boiler Cold Water Make-Up ......34 Safety Notes ............. - Page 3 Commercial Boilers and Water Heaters HERM SECTION 9 SECTION 8 USING THE TOUCH SCREEN FIRST START UP AND ADJUSTMENT Filling the Boiler System ......... 77 The Touch Screen .......... 53 First Operation ..........78 Using the Touch Screen ......... 53 Shutting Down the Unit ........
- Page 4 LAARS Heating Systems...
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Page 5: General Information
P = LP Gas 1.B Warranty Options Code X = Standard US LAARS Heating Systems NeoTherms are covered by a J = CSD-1, FM, GAP, (U.S. size 500-850 only) limited warranty. The owner should complete the warranty C = Standard Canada registration at www.Laars.com. -
Page 6: D Safety Notes
Page 6 LAARS Heating Systems 1.D Safety Notes Safety Notes are used throughout this manual to bring attention to the presence of hazards with various risk levels and to off er important information concerning the life of this product. There are 3 basic types. - Page 7 Page 7 Commercial Boilers and Water Heaters HERM NOTE: All installations must be made in accordance with WARNING 1) American National Standard Z223.1/NFPA54-Latest Electrical Shock Hazard Edition “National Fuel Gas Code” or Electrical shock can cause severe injury, death or 2) CSA B149.1 “Natural Gas and Propane Installation property damage.
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Page 8: E Model Overview
Page 8 LAARS Heating Systems Model Overview These units are offered in both Indoor and Outdoor Both the indoor and the outdoor models have the On/Off switch on the outside of the unit. models for all sizes. Both also have the Rating Plate on the outside panel NOTE: Outdoor Installation of volume water heaters to the right. - Page 9 Page 9 Commercial Boilers and Water Heaters HERM EXHAUST VENT CONNECTION PRESSURE RELIEF VALVE GAS CONNECTION WATER INLET WATER OUTLET AIR INLET CONNECTION TOUCHSCREEN AIR PRESSURE SWITCH ON / OFF SWITCH DRAIN VALVE HEAT EXCHANGER GAS VALVE AIR TRANSITION CONDENSATE TRAP AIR/ GAS BLOWER VENTURI...
- Page 10 Page 10 LAARS Heating Systems EXHAUST VENT CONNECTION WATER INLET PRESSURE RELIEF VALVE WATER OUTLET GAS CONNECTION TOUCHSCREEN AIR INLET CONNECTION ON / OFF SWITCH HEAT EXCHANGER MANUAL SHUTOFF DRAIN VALVE GAS VALVE CONDENSATE TRAP AIR/ GAS BLOWER GAS VALVE VENTURI Figure 4.
- Page 11 Page 11 Commercial Boilers and Water Heaters HERM EXHAUST VENT CONNECTION GAS CONNECTION WATER INLET WATER OUTLET PRESSURE RELIEF VALVE AIR INLET CONNECTION TOUCHSCREEN AIR PRESSURE SWITCH ON / OFF SWITCH DRAIN VALVE MANUAL SHUTOFF GAS VALVE CONDENSATE TRAP HEAT EXCHANGER AIR/ GAS BLOWER GAS VALVE VENTURI...
- Page 12 Page 12 LAARS Heating Systems CONNECTION EXHAUST WATER OUTLET VENT AIR INLET WATER INLET RATING PLATE Indoor 150 MBH CONDENSATE TRAP OUTLET For piping dimensions/ (Trap is built-in) locations for all Indoor units, See Table 1 on page 14 GAS CONNECTION...
- Page 13 Page 13 Commercial Boilers and Water Heaters HERM EXHAUST VENT RATING PLATE AIR INLET FILTER BOX WATER OUTLET Outdoor 150 MBH WATER INLET CONDENSATE TRAP OUTLET (Trap is built-in) For piping dimensions/ CONNECTION locations for all outdoor units, See Table 2 on page 16 PRV must be added to this pipe during installation.
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Page 14: F Dimensions, Indoor Models
Page 14 LAARS Heating Systems Dimensions, Indoor Models Size in cm 13¼ 34 5¼ 14 18¼ 46 3¼ 8 10¾ 28 7½ 19 14¼ 36 19½ 49 7½ 19 15¼ 39 13 33 20½ 52 5¼ 14 18¼ 46 3¼ 8 17¾... - Page 15 Page 15 Commercial Boilers and Water Heaters HERM All Indoor Units have a very (22) (22) similiar component design with piping dimensions/locations that increase as the unit size increases. Water and gas piping is always on the left side of the unit.
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Page 16: G Dimensions, Outdoor Models
Page 16 LAARS Heating Systems 1.G Dimensions, Outdoor Models SIZE 6-1/4" 16 17-1/4" 43.8 23-1/2" 60 18" 45.7 23-1/2" 60 5-1/4" 13 11" 13" 27" 6-1/4" 16 17-1/4" 43.8 23-1/2" 60 18" 45.7 24-1/2" 60 5-1/4" 13 11" 13" 27"... - Page 17 Page 17 Commercial Boilers and Water Heaters HERM VENT SIZE Ø L (Length) T (Total Length) 23-1/2" 60 5-1/4" 13 6-1/4" 16 25-1/2" 65 17-1/4" 43.8 23-1/2" 60 18" 45.7 23-1/2" 60 5-1/4" 13 7" 11" 20" 13" 27" 24-1/2" 60 5-1/4" 13 6-1/4"...
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Page 18: H The Installation Kit (Installation Parts Box)
Page 18 LAARS Heating Systems 1.H The Installation Kit ( installation parts box The Indoor models are shipped in a single crate with the Installation Kit (cardboard box). Check the contents of the Installation Kit with the items listed in Figure 10 and Figure 11. Additional parts may be packed inside the unit. - Page 19 PRV, permitted in Canada. NPT Pipe Tee THIS DOCUMENT AND THE INFORMATION CONTAINED HEREIN ARE PROPRIETARY TO LAARS HEATING SYSTEMS AND SHALL NOT BE REPRODUCED, TRANSFERRED TO OTHER DOCUMENTS, USED OR DISCLOSED TO OTHERS FOR MANUFACTURING OR ANY OTHER 50D4140 Figure 12.
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Page 20: Locating The Unit
Page 20 LAARS Heating Systems SECTION 2 LOCATING THE UNIT 2.B Locating Appliance for Correct Vent 2.A General Information The ‘Indoor’ unit is designed and CSA-certified Distance from Outside Wall or Roof for indoor installations only. Termination The ‘Outdoor’ unit is designed and CSA-certified for... -
Page 21: Venting And Combustion Air
Page 21 Commercial Boilers and Water Heaters HERM INTAKE / EXHAUST STANDARD MIN EQUIV. INTAKE MIN EQUIV. VENT MAX EQUIV. OPTIONAL MAX EQUIV. SIZE VENT VENT 3” * — — 30.5 3” * — — 30.5 4” * — — 30.5 4”... - Page 22 Page 22 LAARS Heating Systems Combustion Air From Room In the United States, When communicating to the outdoors through horizontal the most common requirements specify that the space ducts, each opening shall have a minimum free area shall communicate with the outdoors in accordance of not less than 1 square inch per 2000 Btu/hr (1100 with method 1 or 2, which follow.
- Page 23 Page 23 Commercial Boilers and Water Heaters HERM Use ABS, PVC, CPVC or galvanized pipe for the air are acceptable, providing they conform to the requirements in the applicable codes listed above. combustion air intake. Route the intake to the boiler as directly as possible.
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Page 24: C Venting
Page 24 LAARS Heating Systems WARNING WARNING When an existing Cat I appliance is removed or Failure to use polypropylene CPVC or stainless steel venting for the first 20” (285-600) / 30” (199 / 210) replaced, the original venting system may no longer be sized to properly vent the attached appliances. - Page 25 Page 25 Commercial Boilers and Water Heaters HERM INSTALLATION STANDARDS MATERIAL UNITED STATES CANADA Stainless Steel UL 1738 Venting must be ULC-S636 certified for use as PVC, sch 40 ANSI/ASTM D1785 venting material. The venting material class must be CPVC, sch 40 ANSI/ASTM F441 chosen based upon the maximum flue gas temperature Polypropylene...
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Page 26: D Common Venting
Page 26 LAARS Heating Systems 3.D Common Venting High efficiency boilers and water heaters up to Locate the terminal so the vent exhaust does 500 MBTU/H may be common vented using Non-Return not settle on building surfaces or other nearby Valve kits and Centrotherm InnoFlue polypropylene objects. - Page 27 Page 27 Commercial Boilers and Water Heaters HERM For concentric vent, follow instructions Installations in the Commonwealth of Massachusetts included with vent kit. In Massachusetts the following items are required if the Multiple vent kits should be installed such that the side-wall exhaust vent termination is less than seven horizontal distance between the outlet group and (7) feet above finished grade in the area of the venting,...
- Page 28 Page 28 LAARS Heating Systems Canadian Installations 1 U.S. Installations 2 A = Clearance above grade, veranda, porch, deck, or balcony B = Clearance to window or door that may be ● 6 in (15 cm) for appliances ≤ 10,000 Btuh (3 kW) ●...
- Page 29 Page 29 Commercial Boilers and Water Heaters HERM Locating Combustion Air Terminals (continued) print no less than one-half (1/2) inch in size: “GAS gas fueled equipment is installed in a crawl space VENT DIRECTLY BELOW, KEEP CLEAR OF ALL or an attic, the hard-wired carbon monoxide with OBSTRUCTIONS.”...
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Page 30: F Common Vent Test
Page 30 LAARS Heating Systems Common Vent Test NOTE: This section does not describe a method for common venting these high efficiency condensing units. It describes what must be done when a unit is removed from a common vent system. These units require special vent systems and fans for common vent. -
Page 31: Gas Supply And Piping
Page 31 Commercial Boilers and Water Heaters HERM SECTION 4 WARNING GAS SUPPLY AND PIPING If an inline high gas pressure regulator is used, it MUST BE of the lockup type and located a minimum of 10 feet All Installations must conform to the National Fuel Gas Code ANSI Z223.1/NFPA54, and/or local codes. -
Page 32: Pump Requirements
Page 32 LAARS Heating Systems 4 Gas Supply and Piping (continued) EQUIVALENT LENGTHS OF STRAIGHT PIPE FOR TYPICAL SCH 40 FITTINGS SCHED 40 METAL PIPE CAPACITY FOR 1.50 SPECIFIC GRAVITY UNDILUTED PROPANE NOMINAL PIPE SIZE NOMINAL PIPE SIZE 11” W.C. INLET AND 0.5” W.C. PRESSURE DROP 1/2”... - Page 33 75.9 48.3 58.0 30.5 46.0 20.6 38.0 14.9 33.0 11.7 29.0 95.0 64.5 72.0 38.0 58.0 25.0 48.0 17.5 41.0 13.0 36.0 10.1 108.0 56.6 81.0 34.8 65.0 23.9 54.0 17.4 46.0 13.3 41.0 Page 33 10.9 Commercial Boilers and Water Heaters HERM Flow Flow...
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Page 34: Boiler
Page 34 LAARS Heating Systems SECTION 6 WATER CONNECTIONS - Part A This unit’s efficiency is higher with lower return Section 6 is divided into two parts. Section water temperatures. Therefore, to get the most of low 6A covers Boiler units designed for hydronic return temperature with multiple boilers, pipe as shown in heating. -
Page 35: Condensate Drain
Page 35 Commercial Boilers and Water Heaters HERM Connect a 3/4” PVC pipe between the drain connection and a floor drain (or a condensate pump if a floor drain between 20% and 35% glycol. Typically, this is not accessible). concentration will serve as burst protection for The condensate drain must be installed so as to prevent temperatures down to approximately -5°F (-20°C). - Page 36 Page 36 LAARS Heating Systems Figure 22. Hydronic Piping — Single Boiler, Zoning with Circulators...
- Page 37 Page 37 Commercial Boilers and Water Heaters HERM Figure 23. Hydronic Piping — Single Boiler, Low Temp Radiant Space Heating Using Low Loss Header and Zone Valves...
- Page 38 Page 38 LAARS Heating Systems Figure 24. Hydronic Piping — Multiple Boilers, Zoning with Circulators Figure 25. Hydronic Piping — Multiple Boilers with Indirect DHW Tank Piped from System Loop...
- Page 39 Page 39 Commercial Boilers and Water Heaters HERM Figure 26. Hydronic Piping — Multiple Boilers, Reverse Return, Multi-Temp Zones, Zoning with Circulators...
- Page 40 Page 40 LAARS Heating Systems Figure 27. Hydronic Piping — Heating Zones with Indirect DHW Tank Piped with Zone Pumps The indirect DHW tank is piped directly off of the boiler. The boiler pump must shut down during DHW operation.
- Page 41 Page 41 Commercial Boilers and Water Heaters HERM Figure 28. Hydronic Piping, Multiple Boilers with Indirect DHW Off of One Boiler The boiler pump must shut down during DHW operation.
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Page 42: B Water Heater
Page 42 LAARS Heating Systems SECTION 6 WATER CONNECTIONS - Part B scale buildup and failure of the heat exchanger. Section 6 is divided into two parts. Section 6A covers Boiler units designed for hydronic Cold Water Make-Up heating. Section 6B covers Heater models, 6.B.3... -
Page 43: Heater Suggested Pumps
Page 43 Commercial Boilers and Water Heaters HERM WARNING: This drawing shows suggested piping configuration and valving. Check with local codes and ordinances for additional requirements. NOTES: 1. Optional CWMU & Recirc. line location. 2. Locate Heater DHW sensor or remote aquastat well in lower 1/3 of tank. - Page 44 Page 44 LAARS Heating Systems NOTES: 1. Optional CWMU & Recirc. line location. 2. Locate Heater DHW sensor or remote aquastat well in lower 1/3 of tank. 3. Back flow preventer may be required - check local codes. 4. Thermal expansion tank may be required - check local codes.
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Page 45: Installation And Wiring
An overcurrent protection value should be selected based on these numbers. WARNING Please note that all units with Laars supplied pumps The appliance must be electrically grounded in accordance with the requirements of the authority 399 and greater, it is necessary to use two circuits. -
Page 46: Vari-Prime (Optional Variable Speed Pump Control)
Page 46 LAARS Heating Systems Factory installed resistor Figure 33. Power & Control Panel Layout NOTE: All water heating units are shipped from the factory with a resistor (jumper) between the outdoor sensor terminals (terminals 1 and 2 on TB7). If this resistor is removed, the water heater will not be able to heat water above 140°F. -
Page 47: C Hydronic Heating Using External Modulation Control
Page 47 Commercial Boilers and Water Heaters HERM 7.C Hydronic Heating Using External Modulation Control About External Control - When the unit is used for hydronic heating with external modulation control, a call for heat must be supplied to the “T-T or Interlock” terminal. -
Page 48: E Lead Lag Connections
Page 48 LAARS Heating Systems Lead Lag Connections Lead Boiler These units can be connected in a Lead Lag series up to a total of 8 controllers. One as the Lead control and 7 more as the following controllers. See Figure 34. -
Page 49: F Building Automation System Connections
Page 49 Commercial Boilers and Water Heaters HERM Following Boiler COM2 COM2 TO CASCADING TO CASCADING UNITS 3 THRU 8 UNITS 3 THRU 8 Building Automation System Connections These units can be controlled and monitored through the included Modbus ports. Gateway Control (H2354400 Doc# 4236). -
Page 50: G System Wiring Diagram
Page 50 LAARS Heating Systems 7.G System Wiring Diagram OPTIONAL SWITCH USED ON SOME MODELS. IF SWITCH IS NOT INSTALLED IN TO J4-10 THIS LOCATION. THE TERMINAL JUMPER VALVE SHOULD BE IN PLACE OR/WH COMMON PRESSURE SWITCH "HOT" TO TB1 PIN2... - Page 51 Page 51 Commercial Boilers and Water Heaters HERM DISPLAY TOUCH-SCREEN COM 2 COM 1 OPTIONAL SWITCH USED ON SOME MODELS. IF SWITCH BL/GN TO TB3-1 IS NOT INSTALLED IN TO TB4-1 THIS LOCATION. THE Y/GN PRESSURE TERMINAL JUMPER SWITCH SHOULD BE IN PLACE BOILER BOILER PUMP PUMP...
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Page 52: H Ladder Diagram
Page 52 LAARS Heating Systems 7.H Ladder Diagram Figure 36. Ladder Diagram... -
Page 53: Using The Touch Screen
Page 53 Commercial Boilers and Water Heaters HERM SECTION 8 USING THE TOUCH SCREEN The home screen shows a picture of the unit’s controller. The color of the controller depends on the status, as shown below. Color Status Control Icon The Touch Screen on OUTDOOR Blue... -
Page 54: C Login (Required For Some Parameters)
Page 54 LAARS Heating Systems to go through an additional “verification” process. For Screen Menu Icons more information, see the section on “Configuration.”) When a password is necessary, the system will present the keyboard screen. See Menu 3. There are several icons at the top of the Touch Screen... -
Page 55: D Verification Process For Safety-Related Parameters
Page 55 Commercial Boilers and Water Heaters HERM information on logging in, see Section 8.2.) and asterisks will help you enter the correct number of characters for your password. If you make a change in any group that could When changing a numerical value, the system presents a numerical entry screen, as shown below. -
Page 56: E Checking Individual Parameters
Page 56 LAARS Heating Systems The system will present a listing for each group Checking Individual Parameters of parameters that need verification See Menu 7. From the ‘Home’ screen (Menu 9), press the icon for the controller. Safety Parameter Confirmation Menu 7. -
Page 57: F Setting The Date And Time
Page 57 Commercial Boilers and Water Heaters HERM Setting the Date and Time on the System Display The display includes an internal clock, which keeps track of the date and time. This setting is important, because log entries for Lockouts and Alerts include time listings. -
Page 58: G The Configuration Menu
Page 58 LAARS Heating Systems 8.G The Configuration Menu is the gateway to the parameters that the factory, the installer, or the end user will need in order to setup, service, maintain, or adjust the unit. 8.G.1 There are eighteen (18) items in the Configuration 8.G.2... -
Page 59: System Identification & Access
Page 59 Commercial Boilers and Water Heaters HERM The Configuration Sub-Menus ( 18 ) 1 __ 18 Setting Up 4-20 mA Setpoint 8.G. 8.G.2.b The Central Heat Configuration Menu ( ) has three Some of these configurations will require a Login first. sub-menus and each of them can be reached by See Menu 3 on page 54 scrolling left or right thru the arrows on the left and... -
Page 60: Outdoor Reset Configuration
Page 60 LAARS Heating Systems Outdoor Reset Configuration 8.G.3 Choose S2 (J8-6) 4-20 mA, then press OK At this sub-menu, confirm that Central Heat is Enabled. Next, press onto the Maximum Outdoor Temperature, Minimum Outdoor Temperature, and Low Water Then scroll over to the Modulation sub-menu and Temperature to get to each and adjusting their setpoints in click onto Modulation rate source. -
Page 61: Demand Priority Configuration
Page 61 Commercial Boilers and Water Heaters HERM Demand Priority Configuration 8.G.6 fed by 120V (violet wire) internally from the main power feed. The System and DHW contacts are dry contacts. Appropriate voltage must be supplied to the System and DHW pumps for proper operation. From the Demand Priority Configuration, the installer can adjust the priority of the different demand types. -
Page 62: Statistics Configuration
Page 62 LAARS Heating Systems Statistics Configuration 8.G.12 Anti-Condensation Configuration 8.G.9 Anti-condensation (frost protection) is enabled/disabled on this screen The statistics configuration sub-menu allows the installer to view Burner Cycles, Burner Run Time, DHW Pump Cycles, Boiler Pump Cycles, and System Pump Cycles. -
Page 63: Fan Configuration
Page 63 Commercial Boilers and Water Heaters HERM 8.G.15 Fan Configuration To increase/decrease the speed at which the fan control loop reacts to a decrease in fan speed, adjust the Fan gain down parameter. Similarly, to increase/decrease the speed at which the fan control loop reacts to an increase in fan speed, adjust the Fan gain up parameter. -
Page 64: Lead Lag Follower Configuration
Page 64 LAARS Heating Systems 8.G.17 Lead Lag Follower Configuration Note: The system sensor and outdoor sensor will need to be wired to the Master boiler only. The input from these sensors is used by the Master control to control the modulation rate of all the operating boilers it is connected to. - Page 65 Page 65 Commercial Boilers and Water Heaters HERM 8.G.17 Lead Lag Follower Config (continued) Return to the configuration menu by pressing the Then you will need to confirm that the Follower Back arrow. Next, you will need to confirm that the configuration is Enabled.
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Page 66: Lead Lag Leader Configuration
Page 66 LAARS Heating Systems 8.G.18 Lead Lag Leader Configuration Wiring Connections for Lead Lag - The controller in each boiler includes two wiring terminals for the Modbus system, labeled “MB1” and “MB2.” MB1 has the wiring connections to the... - Page 67 Page 67 Commercial Boilers and Water Heaters HERM 8.G.18 Lead Lag Leader Config (continued) With the Master Control now Enable, press the setting From the ‘Warm Weather Shutdown’ screen, adjust the box labeled ‘CH setpoint’. Here you can adjust the setpoint.
- Page 68 Page 68 LAARS Heating Systems 8.G.18 Lead Lag Leader Config (continued) Press ‘Disabled’’ Note: In the Lead Lag Follower Sub-Menu, Identify each control (including the Lead Lag Master) as a Follower by turning on ‘Follower Enable. From the Status Summary Screen, press the ‘Config- ure’...
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Page 69: G.18.A About Lead Lag Operation
Page 69 Commercial Boilers and Water Heaters HERM 8.G.18.a About Lead Lag Operation Caution You can cascade up to eight You should set the Modbus addresses before (150 - 850 MBH) boilers or water heaters. you connect the Modbus wiring. If the wiring is attached before the Modbus addresses on the controls are changed, there will be multiple For wiring connections to Lead Lag,... - Page 70 Page 70 LAARS Heating Systems Touch Screen Lead Lag Addr Addr Addr Addr Addr Addr Addr Addr Master Boiler 1 Boiler 2 Boiler 3 Boiler 4 Boiler 5 Boiler 6 Boiler 7 Boiler 8 Figure 41. “ Lead Lag” Operation in a System with Eight Boilers. Note: The Displays on Boilers 2 through 8 will display information pertaining only to that specific boiler.
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Page 71: H Configure For A
Page 71 Commercial Boilers and Water Heaters HERM 8.H Configure for a Building Automation System These units can be controlled and monitored through the included Modbus ports. If communication protocols are desired, manufacturer offers the Gateway Control to allow BACnet, LON, and other communications protocols. -
Page 72: I Combustion Setup
Page 72 LAARS Heating Systems Combustion Setup In this section, we will explain how to adjust the gas valve so the unit will run efficiently at both the High Fire and Low Fire conditions. Required tools: Screwdrivers, Torx bits, Allen Wrench Set, Combustion Analyzer... - Page 73 Page 73 Commercial Boilers and Water Heaters HERM 10. Press ‘Minimum Modulation’ Confirm that the boiler is running and then press ‘Start Test’ 11. Press ‘Start Test’. You will have 5 minutes to adjust Low-Fire CO2. Press ‘Stop Test’ when done. 12.
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Page 74: J Adjusting Co 2
Page 74 LAARS Heating Systems Adjusting CO These units use 3 different gas valves depending on the the size of the model. All of them have a Hi-Fire and Low-Fire adjustment. See page 74 for models 150-285, See page 75 for models 399-500, and See page 76 for models 600-850. - Page 75 Page 75 Commercial Boilers and Water Heaters HERM The Gas Valve in the 399 and 500 is at the front of the unit and can be reached after the front panel is pulled forward and then off. Always be patient with your combustion analyzer when making adjustments to the valve at both Hi-Fire and Low-Fire.
- Page 76 Inlet gas pressure High re CO adjustment (under cap) Page 76 LAARS Heating Systems pressure The Gas Valve in the 600 is at the front of Low re CO the unit and can be reached after the front adjustment panel is pulled forward and then off.
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Page 77: First Start Up And Adjustment 9.A Filling The Boiler System
Page 77 Commercial Boilers and Water Heaters HERM SECTION 9 FIRST START UP AND Shut down the entire system and vent all radiation ADJUSTMENT units and high points in the system piping, as described in Step 4. 9.A Filling the Boiler System 10. -
Page 78: B First Operation
Page 78 LAARS Heating Systems 9.B First Operation the gas is off. The ignition control will lockout after a single try or a third try depending on the controller model. Caution The initial setup must be checked before the unit is •... -
Page 79: A System Maintenance
Page 79 Commercial Boilers and Water Heaters HERM SECTION 10 MAINTENANCE Caution Label all wires prior to disconnection when servicing WARNING Disconnect all power to the appliance before controls. Wiring errors can cause improper and danger- attempting any service. Contact with electricity can ous operation. - Page 80 Page 80 LAARS Heating Systems to the gas valve. Remove the electrical connections to the gas valve. Remove the bolts connecting the Venturi flange to the blower. This allows the entire gas valve and Venturi assembly to be removed to facilitate inspection and cleaning.
- Page 81 Page 81 Commercial Boilers and Water Heaters HERM gas valves to the appliance. Remove the front door to The transformer is mounted underneath the control the appliance and the plastic bezel and the control panel. panel. If the transformer must be replaced, turn off the Remove all wire connections from the control board.
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Page 82: C Battery Backup For Date & Time
Page 82 LAARS Heating Systems Optional Gas Pressure Switches WARNING The high and low gas pressure switches are 24V Failure to rinse the debris from the heat exchanger manual reset switches that act to cut power to the gas and temporary drain line may lead to clogged valves if the gas pressure is too low or too high for condensate lines, traps and neutralizers. -
Page 83: D Gas Conversion
Page 83 Commercial Boilers and Water Heaters HERM 10.D Gas Conversion These units can easily be converted from natural to propane gas or from propane to natural gas in the field. Some units require the addition of a gas orifice along with proper gas valve adjustment. -
Page 84: Troubleshooting
Page 84 LAARS Heating Systems Section 11 TROUBLESHOOTING Lockout will appear in an orange bar across the bottom of the screen. If you tap the orange bar, 11.A Lockouts, Holds, and Alerts the system will present more information about The control system responds to three kinds of the Lockout. - Page 85 Page 85 Commercial Boilers and Water Heaters HERM 3. Press the long Yellow Alert or Yellow Lockout Bar If you choose ‘LOCKOUTS’, this menu will appear. (the long bar will be a long Grey ‘History’ Bar if not currently in Alert or Lockout). Menu 5.
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Page 86: B Troubleshooting Table
Page 86 LAARS Heating Systems 11.B Troubleshooting Table This table includes a listing of the fault codes that may be displayed. Some of these can be corrected by changing a parameter, while other conditions are more complicated, and will require a service technician. - Page 87 Page 87 Commercial Boilers and Water Heaters HERM Code Description Lockout Procedure or Hold Internal fault: Safety relay test failed due to safety relay OFF Internal fault: Safety relay test failed due to Internal fault safety relay not OFF 1. Reset module Internal fault: 2.
- Page 88 Page 88 LAARS Heating Systems Code Description Lockout Procedure or Hold 24 VAC voltage low/high 1. Check the module and display connections. 2. Check the module power supply and make sure that frequency, voltage and VA meet the specifi cations.
- Page 89 Page 89 Commercial Boilers and Water Heaters HERM Code Description Lockout Procedure or Hold PII (Pre-Ignition Interlock) OFF H or L 1. Check wiring and correct any faults. 2. Check Preignition Interlock switches to assure proper functioning. 3. Check the valve operation. 4.
- Page 90 Page 90 LAARS Heating Systems Code Description Lockout Procedure or Hold Outlet sensor fault 1. Check wiring and correct any possible errors. 2. Replace the Outlet sensor. 3. If previous steps are correct and fault persists, replace the module. DHW (Domestic Hot Water) 1.
- Page 91 Page 91 Commercial Boilers and Water Heaters HERM Code Description Lockout Procedure or Hold Flame lost in MFEP 1. Check main valve wiring and operation - correct any errors. 2. Check the fuel supply. Flame lost early in run 3. Check fuel pressure and repeat turndown tests.
- Page 92 Page 92 LAARS Heating Systems Code Description Lockout Procedure or Hold Purge fan switch OFF H or L 1. Purge fan switch is off when it should be on. 2. Check wiring and correct any errors. 3. Inspect the Purge Fan switch J6 terminal 3 and its connections.
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Page 93: C Diagnostic Tests And Input/Output Indicators
Page 93 Commercial Boilers and Water Heaters HERM 11.C Diagnostic Tests and Input/ Output Indicators Two kinds of screens are grouped together in this section: • Detailed indications of the input and output signals • Diagnostic tests of the pumps and burner modulation Note that these functions apply to just one selected controller. -
Page 94: E Statistics
Page 94 LAARS Heating Systems 11.D Lead/Lag Slave Diagnostics The control system includes a diagnostic screen that lists some information on the Lead/Lag slaves in the system. See Menu 13 Menu 15. Analysis Setup Screen To use this function, select the parameter you want to track from the pull-down list. -
Page 95: D Lead Lag Follower Diagnostics
Page 95 Commercial Boilers and Water Heaters HERM 11.H Operating Sequence Select one of the controllers listed on the right side When there is a call for heat, the unit will close pump of the screen. Press one of the buttons below the contacts to energize the customer supplied relay/ contactor to start water fl... -
Page 96: Replacement Parts
Page 96 LAARS Heating Systems Section 12 - REPLACEMENT PARTS Use only genuine replacement parts. 12.A General Information To order or purchase parts, contact your nearest manufacturer’s dealer or distributor. If they cannot supply you with what you need, contact Customer Service. (See the back cover for the address, telephone and fax numbers.) 12.B... - Page 97 Page 97 Commercial Boilers and Water Heaters HERM SIZE SIZE SIZE SIZE SIZE SIZE SIZE SIZE ITEM DESCRIPTION BOILER 399 BOILER 500 BOILER 600 BOILER 750 BOILER 850 HEATER 150 HEATER 199 HEATER 285 HEATER 399 HEATER 500 HEATER 600 HEATER 750 HEATER 850 43 Gas/Air Venturi...
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Page 98: Parts Illustrations
Page 98 LAARS Heating Systems SIZE SIZE SIZE SIZE SIZE SIZE SIZE SIZE ITEM DESCRIPTION BOILER 399 BOILER 500 BOILER 600 BOILER 750 BOILER 850 HEATER 150 HEATER 199 HEATER 285 HEATER 399 HEATER 500 HEATER 600 HEATER 750 HEATER 850... - Page 99 Page 99 Commercial Boilers and Water Heaters HERM Internal Components, Internal Components, Parts Illustration 2. Parts Illustration 3. Sizes 150–199 Sizes 285–600...
- Page 100 Page 100 LAARS Heating Systems Internal Components, Sizes 750-850 Parts Illustration 4.
- Page 101 Page 101 Commercial Boilers and Water Heaters HERM Sizes 150-285 Gas Train Components, Sizes 150-500 Parts Illustration 5.
- Page 102 Page 102 LAARS Heating Systems Gas Train Components, Sizes 600-850 Parts Illustration 6.
- Page 103 Page 103 Commercial Boilers and Water Heaters HERM Sizes 285 - Heat Exchanger Components Parts Illustration 7.
- Page 104 PMS® 300 mark, Industrial Way, Rochester, NH, USA 03867 • 603.335.6300 • Fax 603.335.3355 Headquarters: white outline. 9 Brigden Gate, Halton Hills, Ontario, Canada L7G 0A3 (905) 203-0600 Fax: (905) 636-0666 www.Laars.com Printed in U.S.A. © Laars Heating Systems 21-03 Document 1330J...