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Modulating Temperature Control
The heater is equipped with a Raypak modulating tem-
perature control. Refer to information starting on page
31 for information on the setting and use of this con-
trol.
Low Water Cut-Off (Optional)
The optional low water cut-off automatically shuts
down the burner whenever water level drops below the
level of the sensing probe. A 5-second time delay pre-
vents premature lockout due to temporary conditions
such as power fluctuations or air pockets.
High and Low Gas Pressure
Switches (Optional)
The optional low gas pressure switch connection
mounts upstream of the gas valve (on the inlet flange
to the gas valve) and is accessible through the remov-
able access panels on the rear of the heater to reset
the gas pressure switch, as necessary. It is used to
ensure that sufficient gas pressure is present for prop-
39
The optional adjustable manual reset high limit is lo-
cated inside the heater junction box. Push the reset
button and adjust the setting to approx. 40°F (20°C)
above desired outlet temperature.
High Limit - Auto Reset (Optional)
The heater may be equipped with an optional adjust-
able auto reset high limit temperature device.
The optional adjustable auto reset high limit is located
inside the heater junction box. Adjust the setting to
approx. 20°F (10°C) above desired outlet temperature.
Flow Switch
This standard, dual-purpose control, mounted and
wired in series with the main gas valve, shuts off
heater in case of pump failure or low water flow.