(b) Constant fixed by-pass at the farthest end of each circuit. An automatic
by-pass arrangement based on the pressure differential control may be needed
to limit the variable flow operation with pumps "riding the curves".
2.7.4.5.3 For large applications, the use of primary-secondary pumping with
variable speed pump control should be evaluated.
2.7.5 STEAM HEATING
2.7.5.1 GENERAL
(a) See Article 2.9 for Steam Piping and Distribution.
(b) Do not use floor-mounted steam radiators for spaces without sub-
basements, pipe basements, or crawl spaces to avoid problems with steam
condensate return.
(c) See Article 1.10.3 for the required update of the existing steam
radiators.
HVAC DESIGN MANUAL
2-15
HVAC SYSTEMS AND EQUIPMENT
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