Raypak MVB 5042004 - 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.
Controls
The Raypak electronic temperature control is pro-
vided to maintain the desired system water
temperature. The control has various modes of opera-
tion which are described on the following pages.
To minimize short cycling, locate the system (target)
sensor as follows:
Setpoint: The intended system supply temperature.
vent cap can condense as they leave the cap.
Improper location can result in damage to adjacent
structures or building finish. For maximum efficiency
and safety, the following precautions must be
observed:
1. Outdoor models must be installed outdoors and
must use the outdoor vent cap and air intake hood
available from the manufacturer (sales order
option D-11).
2. Periodically check venting system. The heater’s
venting areas must never be obstructed in any
way and minimum clearances must be observed
to prevent restriction of combustion and ventilation
air. Keep area clear and free of combustible and
flammable materials.
3. Do not locate adjacent to any window, door, walk-
way, or gravity air intake. The vent must be
located a minimum of 4 ft horizontally from such
areas.
4. Install above grade level and above normal snow
levels.
5. Vent terminal must be at least 3 ft above any
forced air inlet located within 10 ft.
6. Adjacent brick or masonry surfaces must be pro-
tected with a rust-resistant sheet metal plate.
30
Fig. 29: Outdoor Venting
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.
NOTE: The vent cap and air intake hood must be
furnished by the heater manufacturer in accordance
with its listing (sales order option D-11).