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SERIES 4 — GAS-FIRED WATER BOILER —
4d
Piping — low temperature systems
4e
Water piping — refrigeration system
Figure 25 Piping refrigeration systems
Part Number 550-142-302/0124
Boiler Manual
Figure 24
3 System or zone circulator
7 System temperature valves (see instructions
to the left for adjusting valves)
8 Blend temperature gauge
9 Relief valve
10 Automatic air vent (with diaphragm-type
expansion tank), or connect to tank fitting
(closed-type expansion tank). DO NOT use
an automatic air vent when using closed-type
expansion tank. It would allow air to leave the
system, causing waterlogging of the expansion
tank.
11 Fill valve
12 Diaphragm-type or bladder-type expansion
tank, if used (For closed-type expansion tank,
pipe from top of air separator to tank fitting as
in Figure 17, page 21.)
Prevent chilled water from
entering boiler
(continued)
System-bypass piping — Zoning with
zone valve or circulators, return water
130°F or higher — (Alternative to boiler-
bypass piping Figures 22 and 23)
Install boiler so that chilled medium
is piped in parallel with the heating
boiler. Use appropriate valves to prevent
chilled medium from entering boiler.
See Figure 18 for typical installation of
balancing valve and check valve.
If boiler is connected to heating coils
located in air handling units where they
can be exposed to refrigerated air, use
flow control valves (see Figure 25) or
other automatic means to prevent grav-
ity circulation during cooling cycle.
29
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