Installation guide

This water heater contains the following features:
The front panel of this water heater has a lighted ON/OFF switch, which is illuminated when
the main power is turned on to indicate power to the water heater.
The water heater is equipped with a self-compensating negative pressure pre-mix
combustion system. As the blower operates, air is drawn in through the air intake and into a
venturi, which pulls gas from the gas valve. The gas and air is then mixed in the combustion
blower and sent through the transition tube into the burner. The Hot Surface Ignition System
(HSI) then ignites the gas/air fuel mixture to produce flue products (combustion). The flame
sensor signals the ignition module (described below), that a flame is present.
The ignition module provides the timing for the combustion system. A sequence of operation
(S-OP) is described in “Section 5 - Operating Instructions.” As the combustion system
progresses through the S-OP, LED’s illuminate, allowing accurate trouble-shooting should the
need arise. If a failure occurs, the system will “blink” the LED that corresponds to the failure
as described in the “Section 6 - Troubleshooting Guide.”
This water heater is equipped with an adjustable thermostat to control water temperature.
Hot water temperatures required for Kitchen sinks, sleuces, cleaners sinks and washdown
applications can cause scald burns resulting in serious personal injury and/or death.
The temperature may be adjusted from about 27°C to about 82°C. It is recommended that
lower temperatures be used to avoid the risk of scalding. Refer to the “Warnings” and the
section on SCALDING in “Section 3 - Water Connections.” It is further recommended, in all
cases, that the water temperature be set for the lowest temperature, which satisfies your hot
water needs. This will also provide the most energy efficient operation of the water heater
and minimizes scale formation.
The top immersion well of the single bulb controller also contains the high limit (energy cutoff)
sensor. The high limit switch interrupts the main burner gas flow should the water
temperature reach approximately 93°C.
Should the high limit switch activate, it must be manually reset. This can be accomplished
by depressing the red button on the control panel once the water temperature of the tank has
dropped below 71°C.
Please contact Andrews Water Heaters (details listed on the Data Plate) if continued high limit
switch operation occurs.
INSTALLATIONSECTION 3
MAIN POWER
ON/OFF SWITCH
COMBUSTION
SYSTEM
IGNITION MODULE
ADJUSTABLE
THERMOSTAT
8