LAARS IGI-180C-5(N,X) - Service Manual - Manual (Page 5)

I - GENERAL INFORMATION
This tankless water heater is a high output, high efficiency appliance, which heats the water
continuously as hot water is being drawn for use. Unlike tank type storage water heaters, this water
heater does not store hot water. The burner operates whenever there is a demand for hot water and
is off when the hot water flow stops. Hot water is continuously supplied for any length of time
required as long as the specified flow rates are not exceeded. There is no need to set the
temperature higher than required for sufficient capacity. This water heater has sufficient capacity to
supply several hot water faucets simultaneously. The hot water flow capability will be dependent
upon the temperature of the outlet water selected. Operational feature of this water heater include:
• The burners ignite by direct spark ignition within 3 seconds of detecting minimum
operational water flow. There is no standing pilot.
• A variable speed combustion air blower forces the combustion air supply into the burner
compartment.
• Direct vent design uses only outside air for combustion. The venting system is a coaxial
design requiring a single 5 1/4" (13.3 cm) hole through the outside wall or roof. Vent pipe
fittings have internal gaskets for a tight seal to prevent leakage of flue products and
combustion air.
• The burner flame is continuously monitored and modulated to match the heating
requirements of the water flow. Temperature and flow sensors continually monitor the
water flow and outlet water temperature and adjust the burner and combustion air blower
to maintain temperature.
• The Indoor Direct Vent model series have a digital temperature control integrally mounted
to the front panel of the water heater. The outlet water temperature is adjustable from
96-160°F for residential models or 96-180˚F for commercial models. The front panel
temperature control also displays fault codes if the water heater malfunctions to assist with
servicing the water heater. No installation is required for the main temperature control.
• In addition to the main temperature controller, up to two optional bathroom temperature
controls are available on the residential models for setting the water temperature in the
bathroom fixtures up to 120°F.
• The heat exchanger coil is provided with anti-freeze heaters for protection in cold climate
conditions to ambient temperatures as low as -30°F (-34°C). Drain solenoids should be
installed to drain the water heater in the event of a power failure.
(See installation instructions)
Tools Required for Troubleshooting
Multifunction Digital Test meter with needle point test leads.
Long reach (12") Magnetic Phillips screw driver (#2 Tip)
3/16 Allen wrench
Small (pocket size) blade screw driver
Monometer or Magnehelic inches water column gage
5