Raypak 503-2003 - Manual (Page 30)

Freeze Protection
The Raypak electronic temperature control includes a
freeze protection feature. In the event the temperature
drops below 40°F at any of the boiler temperature sen-
sors, the pump is turned on and will remain on until the
temperature at all boiler sensors rises to 45°F.
30
Fig. 26: Outdoor Venting
Controls
The Raypak modulating temperature control is pro-
vided to maintain the desired system water
temperature. The control has various modes of opera-
tion which are listed on the following pages.
WARNING: Installation, adjustment and service of
heater controls, including timing of various operating
functions, must be performed by a qualified installer,
service agency or the gas supplier. Failure to do so
may result in control damage, heater malfunction,
property damage, personal injury, or death.
WARNING: Turn off the power to the heater before
installation, adjustment or service of any heater
controls. Failure to do so may result in board
damage, heater malfunction, property damage,
personal injury, or death.
CAUTION: This appliance has provisions to be
connected to more than one supply source. To
reduce the risk of electric shock, disconnect all such
connections before servicing.
CAUTION: Risk of electric shock: More than one
disconnect switch may be required to de-energize
the equipment before servicing.
NOTE: Condensate can freeze on the vent cap.
Frozen condensate on the vent cap can result in a
blocked flue condition.