48
ARTC-SVX005B-EN
N
No
otte
e:: See recommended inspection interval in the
maintenance section of this manual.
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5. Verify that pressure and temperature switches are
closed.
6. Restore power to all modules.
7. Inspect refrigerant pressures for each module using
the touchscreen interface panel.
8. Verify that pressure switches and thermostats have
the correct cut-in and cut-out settings using the
touchscreen interface panel.
9. Verify chiller/heater water flow to condenser and
evaporator.
10. Monitor and record temperature and refrigerant
pressures registering on the touchscreen interface
panel.
Emergency Power Shutdown
The chiller does not include a disconnect to turn off the
high voltage to the modules. As per NFPA 70, The
National Electrical Code, a disconnect must be installed
within the line of sight of the electrical and control
panel. Should an emergency condition arise, the
disconnect must be opened to shut down all voltage to
the chiller/heater.
There are several ways to interrupt power to all or part
of the chiller/heater:
•
Disconnect the primary power source from the
building that feeds electricity to the chiller. This
occurs in sudden emergencies (usually weather-
related) or planned maintenance shut-downs.
•
Press the panel disconnect switch on the exterior
door of the chiller/heater’s main power distribution
panel, if so equipped.
•
Move the circuit breaker switch to the OFF position
(CB-1 and CB-2) on the power distribution panel.
This cuts power to all of the chiller/heater modules.
•
Move the circuit breaker switch to the OFF position
(CB-1 and CB-2) on a module’s electrical and control
panel. This cuts power to the compressors in a
single module. It does not cut power to electrical
and control panel or other chiller/heater modules.
•
Press the SYSTEM ON button on the touchscreen
interface panel that is built into the power
distribution panel door.
N
No
otte
e:: Pressing the SYSTEM ON button on the
touchscreen interface panel does not de-energize
the chiller or the high voltage current into each
module’s electrical and control panel. This action
sends a command to the controller in each
module’s compressors to discontinue electrical
current to that component.
Water Quality Guidelines
The chiller is equipped with high efficiency compact
brazed plate heat exchangers (BPHX). Water quality
must be maintained periodically by the end user to
avoid scaling and corrosion inside the heat exchangers.
Table 10.
Water quality guidelines
Element /Compound/
Property
Value/Unit
pH
7.5 - 9.0
Conductivity
< 500 μS/cm
Total Hardness
4.5 - 8.5 dH°
Free Chlorine
< 1.0 ppm
Ammonia (NH
3
)
< 0.5 ppm
Sulphate (SO
4
2–
)
< 100 ppm
Hydrogen Carbonate (HCO
3–
60 – 200 ppm
(HCO
3–
) / (SO
4
2–
)
> 1.5
(Ca + Mg) / (HCO
3–
)
> 0.5
Chloride (Cl-)
< 200 ppm
Notes:
1
.
Total Hardness/corrosion: Water with high hardness can
cause corrosion problems due to its high ion content (Ca+2,
Mg+2, Fe+2) which also means a high electrical conductivity
and a high total dissolved solid (TDS). For this reason, too
high hardness values should be avoided, not only due to
higher risk of scaling, but also for corrosion risk. On the other
hand, soft water, but not necessarily cation exchange
softened water, may in contrast have a low buffering capacity
and so be more corrosive. If the hardness values are outside
the recommended range, other parameters such as oxygen
content, conductivity, and pH values should be considered to
evaluate the corrosion risk
2
.
Fe3+ and Mn4+ are strong oxidants and may increase the
risk for localized corrosion on stainless steels in combination
with brazing material copper.
Monitor Water Quality
Maintaining water/glycol mixture quality and
cleanliness is critical to chiller/heater health and
maintainability. Strainers should be checked and
cleaned on a regular basis. Water/glycol mixture
samples should be taken and tested by a professional
lab. The results will enable the accurate adjustment of
