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Summary of Contents for Laars N Series
- Page 1 Installation Laars N Series Tankless Heater Models Voltage options for LCTEN036 LCTEN054 models: 600V Three-Phase LCTEN063 480V Three-Phase LCTEN072 LCTEN108 415V Three-Phase 400V Three-Phase LCTEN126 380V Three-Phase LCTEN144 238-54231-00 REV 4/21 Doc# 11102...
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Page 2: Table Of Contents
Installation Table of Contents Pre-Installation Information ..............................3-4 Storage Instructions ................................5 Mounting Heater ..................................6 Plumbing Installation ................................7 Electric Installation .................................. 8 Start Up Check List .................................. 9 Start Up ....................................10 Digital Controller Operation ..............................11 Operational Tests ................................12-14 Product Options .................................. - Page 3 Compliance and conformity to local codes and ordinances is the responsibility of the installer. Product warranties may be found under "Resources" on our website at www.laars.com. Separate parts from packaging and make sure all parts are accounted for before discarding any packaging material. If...
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Page 4: Pre-Installation Information
Application Specific Requirements The N Series can be used in many different applications that require custom tuning for specific applications to maximize performance of the heater. -
Page 5: Storage Instructions
NOTICE! Keep Electric Tankless Water Heaters stored in original packaging until installation. Recommended storage criteria: Store N Series Electric Tankless Water Heaters where temperatures exceed 35°F (2°C) at all times. Indoor storage is recommended. Minimize excessive on-site transport to reduce risk of shock and impact damage. -
Page 6: Mounting Heater
Installation Mounting Heater WARNING HIGH VOLTAGE SHOCK. Disconnect power supply before performing any work inside the heater enclosure. If heater is installed where freezing can occur, specify ENHT Freeze Protection option. ENHT option must be purchased at the time of order. Do not install in areas where freezing can occur without the ENHT option listed in the model number. -
Page 7: Plumbing Installation
Installation Plumbing Installation Install shutoff valve above (upstream of) the heater inlet. Components Needed: Install one union on the water inlet side of the heater (4) Union 1-1/4" and another union upstream of the 100 Mesh (150 Shutoff Valve micron) y-strainer. -
Page 8: Electric Installation
Not all available (optional) voltages are listed in the WARNING All heaters must be fused in table. accordance with National Electric Code (NEC) for the full load amperage N SERIES ELECTRICAL SPECIFICATIONS FOR HEATER** listed on the nameplate rating for each heater. Model Voltage... -
Page 9: Start Up Check List
Installation Start Up Check List Plumbing System is set in a vertical, level, and upright position with the outlet located at the top. System is mounted to the wall using the (4) mounting brackets on the back of the enclosure or bolted to the floor with the optional leg kit. -
Page 10: Start Up
Installation Start Up WARNING Make sure the circuit breaker for the heater is OFF. Be sure that plumbing and electrical are complete per Start Up Check List. Slowly turn on water supply to the unit with the Energize the electrical service to the unit by enclosure door open and the circuit breaker in switching on the circuit breaker. -
Page 11: Digital Controller Operation
Installation Digital Controller Operation The preprogrammed digital controller is mounted through the bezel on the enclosure door. The digital controller will be powered but the bottom display will read OFF until water is flowing through the heater. The bottom display will then display the setpoint temperature (see Digital Controller Operation section for more information). -
Page 12: Operational Tests
Installation Perform Operational Test No. 1 Press the up or down arrow keys to adjust the set Ensure the enclosure door is closed prior to temperature. The controller displays the temperature performing operation test. of water measured at the outlet. Located on the panel is one (36kW-63kW) or two (72kW- Set the 3-pole switch or circuit breaker to the 144kW) green ready lights. - Page 13 If the water flow exceeds maximum heating capacity of the heater, the temperature of water at the outlet may be lower than the temperature selected on the controller. See table below to determine maximum temperature rise capabilities. N Series Temperature Rise (GPM & F°)
- Page 14 Installation N Series Skid System (Two back-to-back-N Series Heaters) Temperature Rise (GPM & F°) 4 gpm 8 gpm 12 gpm 16 gpm 20 gpm 24 gpm 30 gpm 40 gpm 50 gpm 60 gpm 70 gpm 480/600V ΔT °F ΔT °F ΔT °F...
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Page 15: Product Options
Installation Product Options AL High-Low Temperature Alarm: Alerts user to an over or under temperature situation. GF (Ground Fault): Detects electrical leakage from external sources to protect equipment, electronics, and the heat exchanger from being damaged in the event of a power fault . After turning on water, then power, test ground fault: 1. -
Page 16: Maintenance
Installation Maintenance Preventative maintenance is important for optimal performance of the heater . To ensure the heater works properly, always keep the inside of the enclosure dry . Moisture inside an enclosure increases the humidity, which condenses on cooler surfaces . This can cause electrical problems and reduce the efficiency of enclosure insulation. To prevent problems, perform the following: Verify the interior of the enclosure is dry . -
Page 17: Troubleshooting
Installation Troubleshooting for Controller Problem Solution No Power Verify power is on . Check incoming service connection . Voltage must match name plate rated voltage . Labels are located on upper left of back plate (serial number label) . Turn power off . Check continuity of all internal fuses in control transformer, heating elements or optional fused disconnect circuits . - Page 18 All internal breakers must be in the ON position for the unit to work. For additional information on Troubleshooting or other information, contact Laars Technical Support. Please have Model No . and Serial No . available when seeking technical assistance . Serial No . tag is located in the enclosure on the upper left hand corner of the back plate .
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Page 19: Special Installation And Operating Instructions
Installation Special Installation and Operating Instructions Tankless Water Heaters With Optional Class I Division 2 Purge EXP2CFPM Option General Information Tankless Water Heaters with model number suffix of - EXP2CFPM have been fitted with a Z purge system to pressurize the enclosure suitable for use in Class I Division 2 Hazardous Locations. A Continuous Flow (Model CF) Mini-Z Pressurizing System has been fitted to the inside of the enclosure . - Page 20 Installation Purge Gas Supply Notes An alarm shall be provided to indicate failure of the protective gas supply to maintain the required pressure . Piping for the protective gas shall be protected against mechanical damage . Where the compressor intake line passes through a classified location, it shall be constructed of noncombustible material, designed to prevent leakage of flammable gases, vapors, or dusts into the protective gas, and protected against mechanical damage and corrosion .
- Page 21 Installation IS Installation continued… All quarter turn latches in the door of the PE must be fully latched for proper operation. Power to the PE must be turned off before opening the enclosure . WARNING This pressurized enclosure shall not be opened unless the area is known to be free of flammable materials or unless all devices within have been de-energized.
- Page 22 Installation Tankless Water Heaters with Optional D1 or DC Controller Options Pin-Out Diagram for Electrical Wiring The controller is shipped with the D1 option deactivated. Contact Bradford White to get the unlock code to activate the option. DC Option Pin-Out D1 Option Pin-Out Name Description...
- Page 23 Installation Table of Parameters for DC Option: RS-485 Modbus Map 1 Map 2 Parameter Name Range Default Data Type Read/ Write N-Series Meaning -1999.000 to 9999.000 °F Analog Input Float Process Value -1128.000 to 5537.000 °C None (61) Open (65) Fail (32) Shorted (127) Analog Input Error...
- Page 24 Installation Special Installation Maintenance Routine Maintenance of the System (Every 6 months) Recommended maintenance of the systems is as follows: Repeat Commissioning test at least every six months . The test includes checking the opening pressure of the Relief Valve, setting of the Minimum Pressure Sensor, the “Normal Working Pressure” of the enclosure . Test that the interlock and alarms function correctly .
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