Emergency Power Shutdown; Water Quality Guidelines; Monitor Water Quality - Trane Manhattan Gen II Installation, Operation And Maintenance Manual

Operating Procedures
2. Using a known operational voltage meter, test and
confirm the chiller is de-energized before proceeding
further.
3. Inspect power distribution fuses and overload settings
to verify they are correct.
4. Verify that the oil level is correct in each compressor
using the compressor sight glass.
NOTICE
Compressor Failure!
Failure to follow instructions below could result in
catastrophic compressor failure. Do not operate with
insufficient oil.
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 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.
There are several ways to interrupt power to all or part of
the chiller:
• 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.
• Turn the panel disconnect switch on the exterior
door of the chiller'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 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 modules.
38
• Press the SYSTEM ON button on the touchscreen
interface panel that is built into the power
distribution panel door
Note: Pressing the ON-OFF 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 6. Water quality guidelines
Element /Compound/
Property
pH
Conductivity
Total Hardness
Free Chlorine
Ammonia (NH )
3
2-
Sulphate (SO )
4
Hydrogen Carbonate (HCO
3-
4 2-
(HCO ) / (SO )
3-
(Ca + Mg) / (HCO )
3-
Chloride (Cl-)
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 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 quality thereby increasing the operational
life of the chiller.
Note: Trane will not validate the chiller warranty if the
proper water/glycol mixture composition and
quality is not maintained.
Value/Unit
7.5 - 9.0
< 500 μS/cm
4.5 - 8.5 dH°
< 1.0 ppm
< 0.5 ppm
< 100 ppm
) 60 – 200 ppm
> 1.5
> 0.5
< 200 ppm
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