Carrier 19 Series - Manual (Page 12)

Using the 19DH,EB,CB model numbers
When ordering 19DH, 19EB or 19CB chillers, use the
ordering code described below. Chiller nozzle arrange­
ment and compressor voltage must be listed separately.
(19C8) Condenser--------------------------------------------------
Heat Exchanger (HE) (UN)-
{19CB) Cooler------------------
1 9 E B 8 1 6 5 D K
Model (19DH, 13EB, 19CS)-
Heat Exchanger or Unisheil (UN) •
Compressor (CS)-----------------------
Motor---------------------------------------
List chiller model in first 4 code number positions
Obtain Unishell or heat exchanger size from step V of the Selec­
tion Procedure and enter in positions 5 & 6
Obtain compressor size from step V of the Selection Procedure
and enter in positions 7 & 8
Obtain motor size from step VII of the Selection Procedure and
enter in positions 9 & 10
Using the 19FA model number
When ordering 19FA chillers, use the ordering system
described below.
1 3 F A 5 6 3 - B - 5 0 0 - 2 4 2 5 - L - E C
Cooler -
Heat Exchangers (HE)
Condenser-
Base Size (S, small or L, large)
Motor Size (MS)-------------------------------------------------------------
1 List chiller model in first 4 code number positions
2 Obtain compressor size from step V of the Selection Procedure
and enter in positions 5, 6 and 7
3 Also from step V of the Selection Procedure, obtain gear size
and refrigerant used Enter gear size in position 8, next enter
refrigerant in 9-11 (May only need to use 9 & 10 )
4 Obtain heat exchanger size from step V of the Selection Pro­
cedure and enter the cooler size in positions 12 & 13 and the
condenser size in positions 14 & 1 5
5 Base size is indicated in position 16
6 Obtain motor size from step VII of the Selection Procedure and
enter in positions 17 & 18
Part-load energy requirements
At part load, chiller energy requirements are aifected by
many variables, such as degree of load, chilled water flow,
condenser water flow, entering condenser water tempera­
ture, leaving chilled water temperature, and the percentage
of compressor loading at design conditions.
Because of these many variables, a typical part-load
curve (% Standard Rating Tons versus % Standard
Rating Kw Input) may have appreciable inaccuracies
when applied to a specific chiller and set of conditions.
Carrier, therefore, does not recommend the use of
such curves in making operating cost studies.
Instead, thru computer analysis. Carrier will provide
you with accurate and detailed information on the energy
requirements for your selected chiller at the expected
jobsite conditions.
Energy savings can be significant if the chiller can be
operated with a relatively low entering condenser water
temperature. And, since conditions of design load and
design wet-bulb temperature can occur rather infrequently,
the opportunity for such savings exists during most of the
operating season. Each chiller is capable of operating
efficiently with entering condenser water temperatures
down to 55 F (13 C). This capability assures you of both
energy conservation and excellent part-load performance,
because “custom-made chillers” give the best part-load
performance.
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