15
14 LOW WATER TEMPERATURE SYSTEMS
In applications where the heating system requires supply water temperatures below 130°F (55
o
C), a
bypass line must be installed upstream of the boiler pump so that outlet water can be re-circulated to
raise the inlet temp to a minimum of 130°F (55
o
C). Balancing valves, preferably globe valves are used to
adjust flow (See Figure 6). Alternatively, a thermostatic mixing valve may be supplied (available as a
factory option)
Figure 6: Low Water Temperature System
• Adjustment procedure.
a. Fully open bypass and outlet valves.
b. With boiler running, read inlet temperature after 15 minutes.
c. If the inlet temperature is less than 130°F (55
o
C) slowly close outlet valve until the inlet
temperature climbs to 130°F (55
o
C)
d. If the inlet temperature is greater than 130°F ( 55
o
C) but not greater than 140°F (60
o
C) no
further adjustment is required.
e. Check the inlet temperature after 5 minutes and make final adjustments.
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