AC-SVX002C-EN
33
Table 12.
Low ambient refrigerant temperature cutout (LERTC) and low water temperature cutout (LWTC) —
propylene glycol (continued)
Glycol
Percentage
(%)
Solution
Freeze Point
(°F)
Minimum
Recommended
LERTC (°F)
Minimum
Recommended
LWTC (°F)
Minimum Chilled Water
Set Point
(°F)
51
-28.3
-21.0
-7.0
0.0
52
-30.8
-21.0
-7.0
0.0
53
-33.4
-21.0
-7.0
0.0
54
-36.1
-21.0
-7.0
0.0
55
-38.9
-21.0
-7.0
0.0
High Head Pump Package
Pump package includes: one or two high head pumps,
VFD, drainage valves, shut-off valves at entering and
leaving connections. See pump package unit schematic
below.
N
No
otte
ess::
1. Water piping system shall be equipped with
an expansion tank, field installed outside of
pump package.
2. The pump package is single point power
integrated into the chiller unit power with a
separate factory wired control panel. The
control of the pump is integrated into the
chiller controller.
The unit controller displays evaporator pump starts
and run-times. Freeze protection down to an ambient
of -4°F (-20°C) for water, or -20°F (-29°C) for ethylene
glycol or propylene glycol, is included. The cold parts
of the pump package will also be insulated. Designed
with one redundant pump, the chiller controls both
pumps through a lead/lag and failure/recovery
functionality. One or two variable speed drives are
installed in an additional panel to control the pump.
N
No
otte
e:: Speed command is also available for customer-
provided variable flow input.
Figure 17.
Pump package unit — field water piping
CUSTOMER PIPING
A
2
1
2
3
3
Building/
Process Load
Unit with
Pump Package
Option
Table 13.
Pump package unit — field water piping
components
Item
Description
1
Bypass Valve
2
Isolator Valve
3
Vibration Eliminator
A
Isolate unit for initial water loop cleaning
Note:
Water piping system shall be equipped with an expansion
tank, field installed outside of pump package.
