Raypak RAYTHERM 133-4001, Installation & Operating Instructions Manual

Page: 26 / 52

26
on-off cycling heater. The valve has a remote capillary
bulb immersed in a well, at the header outlet, to main-
tain a constant outlet water temperature. When
multiple valves are furnished, they can be staged to
give greater flexibility of control. Standard factory set-
ting is at position 5. Consult the dial setting tag
attached to the control for your desired temperature.
See Fig. 22 below.
Fig. 22: Dial Setting Tag
Fig. 23: Mechanical Modulating Valve Location—
Models 0724-1336
Fig. 24: Motorized Gas Valve Location—Model 3001
Limit Controls
High Limit
The heater is equipped with a manual reset High Limit.
Push the reset button and set the limit(s) to 30°F–40°F
above desired operating temperature. Maximum set-
ting is 200°F; other options may be available.
Flow Switch
This dual-purpose control shuts off the heater in case
of pump failure or low water condition and is strongly
recommended. It is mounted and wired in series to the
main gas valve.
Fig. 25: High Limit
NOTE:
The flow switch is a safety device and not a
control. Do not operate the heater with flows less
than the minimums stated in this manual.
Fig. 26: Flow Switch