Laars H Series User manual

Installation
Laars H Series
Tankless Heater Models
LCTEH005, LCTEH006
LCTEH010 & LCTEHV010,
LCTEH015 & LCTEHV015,
LCTEH018 & LCTEHV018,
LCTEH025
Voltage options:
208V Single & Three-Phase
240V Single & Three-Phase
277V Single-Phase
380V Three-Phase
400V Three-Phase
415V Three-Phase
480V Single & Three-Phase
238-54232-00 REV 4/21
Doc#11099

Installation
2
Table of Contents
Pre-Installation Information ................................................................................................................................................ 3-4
Storage Instructions ............................................................................................................................................................... 4
Mounting Heater .................................................................................................................................................................... 5
Plumbing Installation .......................................................................................................................................................... 6-7
Electric Installation ................................................................................................................................................................. 8
Start Up Check List ................................................................................................................................................................. 9
Start Up ................................................................................................................................................................................ 10
Digital Controller Operation ................................................................................................................................................. 11
NEMA 4/4X Digital Controller Operation ............................................................................................................................. 12
Perform Operational Test No. 1 ........................................................................................................................................... 13
Perform Operational Test No. 2 ........................................................................................................................................... 13
Product Options ................................................................................................................................................................... 14
Maintenance ........................................................................................................................................................................ 15
Troubleshooting .............................................................................................................................................................. 16-17
Special Installation and Operating Instructions .............................................................................................................. 18-19

Installation
3
DANGER
Tip over hazard. System can crush you resulting in serious injury or death. Read and follow precautions in this
installation manual that accompanied the heater for instructions on how to safely transport and mount. DO NOT
transport with the heater in the vertical position. This heater is top heavy and should not be placed in the vertical
position until the site is prepared to anchor the heater to the wall or the legs to the floor.
WARNING
Read this manual BEFORE using this equipment. Failure to read and follow all safety and user information could result
in death, serious personal injury, minor burns, property damage, or damage to the equipment. Keep this manual for
future reference. Failure to comply with proper installation and maintenance instructions could contribute to the
heater’s failure.
A qualified plumber or electrician should install and service this system. Install system according to these instructions
and in compliance with national and local codes.
ASSE standard 1016, 1069, or 1070 listed devices should be used at fixtures to prevent possible injury. Severe bodily
injury including scalding, chilling, and/or death may result depending upon system water pressure changes and/or
supply water temperature changes.
For safe operation of the heater, observe all warning labels as indicated.
Water heater system under pressure. DO NOT open enclosure while in operation.
These heaters should never be used to provide “anti-scald” or “anti-chill” service.
Hazardous voltage inside enclosure may result in serious burns or death. Disconnect power supply before performing
any work in the enclosure.
Failure to ground this system may result in death or serious injury.
Make sure that all water supply lines have been flushed and then completely turned off before beginning installation.
Debris in supply lines can cause valves to malfunction.
CAUTION
Hot pipes! DO NOT touch. May cause minor burns.
NOTICE
These heaters DO NOT provide protection from supply or outlet pipe freezing.
Consult local building and plumbing codes prior to installation. Should these codes differ from the information in the
manual, follow the local codes. Inquire with governing authorities for additional local requirements.
Regular checking and cleaning of the heater’s internal components and check stops is necessary for maximum life and
proper product function. Periodic inspection and yearly maintenance by a licensed contractor is required. Corrosive
water conditions, and/or unauthorized adjustments or repairs could render the heater ineffective for its intended
service. Frequency of cleaning and inspection depends upon local water conditions. For heaters with adjustable
output temperatures, check and adjust as needed at initial installation and on a quarterly basis.
IMPORTANT
Read this entire installation manual to ensure proper installation. When finished with the installation, file this
manual with the owner or maintenance department. 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
any parts are missing, do not begin installation until you obtain the missing parts.

Installation
4
Pre-Installation Information
General Information
The H Series Tankless Water Heater provides instant and precise temperature-controlled hot water. To ensure proper
performance, install the heater according to the following installation instructions and in compliance with applicable
national and local codes.
Flow rates and temperature figures are important for proper sizing If needed to meet certain temperature demands,
flow control devices are readily available See temperature rise table for specifications Contact Laars representatives for
further information on available flow control devices.
Operation and Setup
H Series heaters supply an unlimited amount of hot water with specific flow and temperature rise capabilities. These
heaters are energy efficient, reliable, and provide optimum performance in the most demanding applications.
Application Specific Requirements
The H Series can be used in many different applications that require custom tuning for specific applications to maximize
performance of the heater.
For use in a re-circulation loop, the incoming loop temperature should not exceed 140°F (60°C).
For applications utilizing quick close valves or solenoid valves, it is important to install a hammer arrestor or surge tank
close to the point of use to absorb pressure spikes.
Installation Considerations
Maximum operating pressure: 150 psi (10 bar)
ASME maximum operating pressure: 160psi (11 bar)
Standard flow activation: 1.5 gpm (5.7 lpm)
Certifications
Electric Tankless Water Heaters are certified by ETL to UL499, cETL listed to CSA-C22 2 No 88 and third party certified to
NSF/ANSI 372.
WARNING For safe operation of the heater, observe all the warning labels as indicated.
Storage Instructions
NOTICE! Keep Electric Tankless Water Heaters stored in original packaging until installation.
Recommended storage criteria:
Store 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.
Packaging
Box dimensions approx: 30" x 15" x 6" (762mm x 381mm x 152mm)
All boxes must be stacked evenly and horizontally.
Safety issues related to packaging:
 Product should be transported with the care associated to packages labeled “FRAGILE” even if packaging is not
marked accordingly.
 Standard safety procedures for forklift transport and large items less than 1000lbs (454 kgs) should be followed at
all times.

Installation
5
1 Mounting Heater
WARNING HIGH VOLTAGE SHOCK. Disconnect power supply before performing any work inside
the heater enclosure.
Installation should be performed by a qualified plumber or electrician.
For best results, install heater as close as possible to the point of use.
Long pipe runs are not recommended. A heat loss of 1°F for every 10ft (3 meters) of uninsulated pipe can occur.
When determining a mounting location, give consideration to the location of the main electrical panel and ensure
accessibility of the cabinet enclosure door and other plumbing for service/maintenance.
Set heater in a vertical, upright position with the
water outlet located at top.
Depending on the application, the unit may also
be installed rotated clockwise 90° with the inlet
and outlet to the right.
Mount heater to the wall using the (4) mounting
brackets on the back of the enclosure. Bolt the
heater to the vertical surface. Mounting holes
are designed for a maximum bolt tize of ¼”
(6mm) bolt diameter..
Heater should be mounted on a vertical surface
and securely hold a minimum of 45 pounds. Use
lead or plastic anchors when mounting directly
onto concrete or block walls.
Install the pressure and temperature relief valve
on hot water outlet immediately following the
union.
NOTICE! Valve must empty into a drain.

Installation
6
2 Plumbing Installation
Install shutoff valve above (upstream of) the
heater inlet.
Components Needed:
 (2) Union 3/4"
 Shutoff Valve
 Pressure and Temperature Relief Valve (150 psi/10 bar)
 Y-Strainer (100 mesh) or Inline Filter (150 microns)
 (2) Gate or Ball Type Valves
 Drain pipe
 Water hammer arrestor (recommended)
 Elbows, nipples and fittings as needed
CAUTION To avoid damage to the electronics or internal
wiring, do not perform any brazing or sweat
soldering inside the enclosure.
NOTICE! Failure to install proper filtration may result in a
flow switch malfunction.
NOTICE! To avoid water damage, install a drain pipe from
the pressure relief valve to an unrestricted drain.
If end use fixture is not at the highest point in the
plumbing loop, then an automatic air vent valve must
be added at the highest point in the system or at any
drop to eliminate trapped air.
Install one union on the water inlet side of the heater
and another union upstream of the 100 Mesh (150
micron) y-strainer.
Install one union on the water outlet side of the
heater and another after the T & P Relief Valve.
Install the pressure relief valve (150 psi/10 bar) and
outlet plumbing of heater per code requirements and
route relief valve discharge to drain. Make sure no
shutoff valve is between the water heater outlet and
the relief valve, as well as no shutoff valve between
the relief valve discharge and drain. Ensure plumbing
is secure and not subject to vibrations.
WARNING The heater must be lying flat to do any
soldering on the inlet or outlet tubes. Soldering on
the inlet or outlet tubes in the upright position can
damage internal components. Damage caused by
dripping solder or flux can make your heater
inoperable.
Use 3/4" hard copper tubing or pipe as needed.
Dimensions, Plumbing and Electrical Configurations
V Series heaters have 1/2" inlet and outlet and require 1/2" copper tubing.

Installation
7
2 Plumbing Installation cont…

Installation
8
3 Electric Installation
WARNING Install product to rated line voltage in
accordance with current local and
national codes and regulations.
WARNING All heaters must be fused in
accordance with National Electric Code
(NEC) for the full load amperage listed
on the nameplate rating for each
heater.
WARNING Failure to properly ground the unit(s)
per the National Electric Code could
result in injury or death.
ELECTRICAL SPECIFICATIONS FOR HEATER
(Single-Phase)
kWattsAmpsVoltageModel Min Wire Size
12 AWG*613480LCTEH006J
10 AWG*1021480LCTEH010J
06 AWG*1838480LCTEH018J
10 AWG*622277LCTEH006E
03 AWG*1865277LCTEH018E
10 AWG*521240LCTEH005D
08 AWG*625240LCTEH006D
06 AWG*1042240LCTEH010D
04 AWG*1563240LCTEH015D
03 AWG*1875240LCTEH018D
10 AWG*524208LCTEH005H
08 AWG*629208LCTEH006H
04 AWG*1048208LCTEH010H
03 AWG*1572208LCTEH015H
03 AWG*1887208LCTEH018H
ELECTRICAL SPECIFICATIONS FOR HEATER
(Three-Phase)
Min Wire SizekWattsAmpsVoltageModel
12 AWG*1013480LCTEH010S
10 AWG*1822480LCTEH018S
06 AWG*2551480LCTEH025S
10 AWG*1521415LCTEH015P
08 AWG*1826415LCTEH018P
10 AWG*1522400LCTEH015N
08 AWG*1826400LCTEH018N
10 AWG*1016380LCTEH010M
10 AWG*1523380LCTEH015M
08 AWG*1828380LCTEH018M
06 AWG*1536240LCTEH015L
06 AWG*1843240LCTEH018L
08 AWG*1028208LCTEH010K
06 AWG*1542208LCTEH015K
06 AWG*1850208LCTEH018K
*Based on the NEC Table 310.15 for 75°C insulated copper wire @ 30°C
Ambient. Aluminum wire requires larger gauges.
Not all available (optional) voltages are listed in the
table.
For standard enclosures, remove the four screws
and take the bottom cover off. For NEMA 4/4X
enclosures, open the enclosure door.
NOTICE! Any option that requires field wiring must be
done with 600V cable per the schematic that
was shipped with the heater.
NOTICE! Use a 4-core cable or multi-stranded machine
tool wire from an approved isolating 3-pole
switch or circuit breaker.
NOTICE! Make sure the electrical cable is the correct
size to carry 100% of the full load current. See
table for proper wire sizes.
Standard: A pre-cut hole is already sized for
conduit connection. Skip to step C.
NEMA 4/4X: Using a hole punch, cut a hole the
proper size for the conduit connection; large
enough for the wire size for each heater. The
connectors need to be rated NEMA 4/4X to
ensure proper sealing of the enclosure.
Run wires through the appropriate size conduit.
Connect wires to the system terminal block or
fused disconnect inside the enclosure.
Connect the ground wire to the stud provided
with the “Ground” label beneath it.
If unit is ordered with a D1 or DC controller,
option, the DB9 connector for hookup on a
standard unit is located on the upper left/hinge
side of the cabinet. Please review the appropriate
Special Instruction & Operation Instructions
section for information regarding controller
programming and wiring. Proceed to the Start Up
Checklist once the steps in the Special Installation
& Operation Instructions section have been
completed or if you do not have this option.

Installation
9
4 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.

Confirm installation of shutoff valve above (upstream of) the union on the inlet connection Confirm
installation of a Y-strainer (100 mesh screen) or inline filter (150 micron) between the inlet shutoff valve
and the heater.

Pressure and temperature relief valve is installed on tepid water outlet immediately following the union No
valve or restriction is between the relief valve and the system or the relief valve and drain Shutoff valve is
installed after pressure and temperature relief valve on outlet if required by local or national plumbing
codes.

If the hot water process is not at the highest point in the plumbing loop, then an automatic air vent valve
must be added at the highest point in the system plumbing loop to eliminate trapped air.
Electrical

Verify supply voltage matches the indicated voltage on the Serial Tag. Serial Tag is located within the heater
enclosure on the upper left corner of the back plate (mounting plate).

Appropriate conduit is installed properly, secured and sealed to unit enclosure per NEC and hazard location
requirements.

Appropriate conductors for unit routed through conduit and secured to power block inside the enclosure
All electrical is installed in accordance with national and local electrical codes, including fuse size and rating.

Appropriate earth ground is installed to the lug provided on enclosure backplate.

Installation
10
5 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
enclosure door open and the circuit breaker in
the off position.
Energize the electrical service to the unit by
switching on the two or three pole swich or
circuit braker. Unit is now in the ready state.
Slowly turn on the water outlet valve, activate
the connected process requiring heated water
(faucet, shower, etc.), then flush the system for 5
minutes to ensure all air is purged from the
system.
NOTICE! Failure to bleed air properly will
damage elements and cause heater
malfunction.
Turn on the connected process; observe
output temperature rise to setpoint.
On standard controller, set point and output
temperatures are located side by side. On
the NEMA 4/4X controller, the top portion of
the tempearture controller displays output
temperature, bottom displays setpoint
temperature.
Turn off the connected process and check the
entire system to verify leak-free installation.
If unit is ordered with the D1 option, the
controller is shipped with this option
deactivated. Contact a Laars representative
to get the unlock code to activate the
option.
Secure the enclosure cover (standard) or door
(NEMA 4/4X).
NEMA 4 is standard on model LCTEH025.
When startup is complete, leave the two or
three pole switch or circuit breaker in the
ON position. The digital display should read
ambient temperature and OFF.