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CSRA-SVX01A-EN
Pre-Start
Procedures
Table 8: Normal Operating Pressures (Approximate)
Ambient (F)
Suction
Pressure
(psig)
45
58
60
59
75
60
85
61
95
62
105
63
115
64
Ethylene Glycol Adjustment Factor
The addition of ethylene glycol to the chilled water system reduces unit
capacity. To determine pressure drop of a glycol solution, obtain the pressure
drop adjustment factor from the chart in Figure 16 and multiply times the
pressure drop of water without glycol, i.e.;
∆P
=
H
O∆P
Glycol
2
Notes:
1. Based on steady state conditions with 54° F entering water temperature (EWT)
and 44° F leaving water temperature (LWT).
2. An increase of 5° F in LWT while keeping the 10° F temperature drop will result in
an increase of approximately 6 psi in discharge pressure when compared to the
54° F EWT, the 44° F LWT given in Table 8.
3. Pressure at low ambients will not match this table if a head pressure control is
installed and operating.
10 Ton
Discharge
Suction
Pressure
Pressure
(psig)
128
163
204
234
266
301
339
x Adj. Factor
15 Ton
Discharge
Pressure
(psig)
(psig)
56
139
58
174
59
214
60
244
61
276
62
310
63
347
35
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