ClimaCool SHC onDEMAND 30, 50, 70, 85 Manual - Manual (Page 14)

www.climacoolcorp.com
12
Š‹•„›’ƒ•• ƒƒŽ•‘„‡ ”‡ƒ–‡†™‹–ŠƤ‡Ž†•—’’Ž‹‡†’‹’‹‰Ǥ
The design piping must accommodate one module’s worth
‘ˆ†‡•‹‰ƪ‘™ǡƒ†„‡’‘•‹–‹‘‡†•‘–Šƒ––Š‡–‡’‡”ƒ–—”‡
ƒ††‹ơ‡”‡–‹ƒŽƪ‘™•‡•‘”••‡•‡ƒ –‹˜‡ƪ‘™‹–Š‡
bypass mode. See Figures 9 and 10 on page 13 - Water
‹’‹‰‘Ƥ‰—”ƒ–‹‘ǤŠ‡Ƥ‡Ž†•—’’Ž‹‡†’‹’‡† Š‹ŽŽ‡”Ȁ
Š‡ƒ–‡”•›•–‡„›’ƒ••—•–„‡ ‘–”‘ŽŽ‡†„›‘–Š‡”•Ǥ There
are system communication delays, polling and network
‘ƪ‹ –•–Šƒ–•–”‹ –Ž›’”‘Š‹„‹––Š‡—•‡‘ˆŽ‹ƒ‘‘Ž•‡•‘”•
ƒ† ‘–”‘Ž•ˆ‘” ‘–”‘Ž‘ˆƤ‡Ž†•—’’Ž‹‡†„›’ƒ••‡•‘”‘–Š‡”
Ƥ‡Ž†•—’’Ž‹‡†‹–‡•Ǥ‡ ‘‡†‡†‡–Š‘†‹•–‘ ‘–”‘Ž˜‹ƒ
†‹ơ‡”‡–‹ƒŽ’”‡••—”‡‘”‰’ƪ‘™‡–‡”•ƒ ”‘••–Š‡ Š‹ŽŽ‡†
water/evaporator, hot water/condenser and source
water systems. ‘ƒ†‹†‡›•–‡›’ƒ••ȋ‹”ƒ†Ž‡”•ǡ ƒ
Coils, etc.)
A load system bypass is required for preventing pump
†‡ƒ†Š‡ƒ†‹‰ǡƒŽŽ‘™‹‰ƒ –‹˜‡ƪ‘™•›•–‡•‡•‹‰ƒ†
’”‡˜‡–‹‰•–ƒ”˜‹‰ƪ‘™ˆ”‘–Š‡ Š‹ŽŽ‡”ȀŠ‡ƒ–‡”•›•–‡Ǥ
Examples of an acceptable load side system bypass are:
•Utilize a quantity of 3-way control valves on the largest
loads farthest from the chiller/heater system.
•Field piping with a control valve to provide a bypass across
the larger system loads when their 2-way valves go closed.
Please refer to Figure 8 for a typical load bypass
valve arrangement.
The load side system bypass should be sized for an
ƒ„•‘Ž—–‡‹‹—‘ˆ‘‡‘†—Ž‡ǯ•™‘”–Š‘ˆ†‡•‹‰ƪ‘™Ǥ
ȋŽ‡ƒ•‡”‡ˆ‡”–‘•‡Ž‡ –‹‘•—„‹––ƒŽ•ˆ‘”†‡•‹‰ƪ‘™”ƒ–‡•ȌǤ
A minimum of (6) six gallons per nominal system ton are
also required to maintain proper system thermal inertia. This
is to avoid short cycling of compressors in the chiller/heater
system as well as prevent nuisance alarms.
LOAD 1
FROM CHILLER BANK
TO CHILLER BANK
LOAD Ϯ LOAD 3 LOAD X
TYPICAL CHILLED AND HOT WATER
LOAD SIDE BYPASS VALVES
SIZE EQUIVALENT TO ONE MODULE
WORTH OF FLOW
‹‰—”‡͜Ǧ›’‹ ƒŽ‘ƒ†›’ƒ••ƒŽ˜‡””ƒ‰‡‡–