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Operating Procedures
disconnect switch must be opened to shut down all voltage
to the heat pump.
There are several ways to interrupt power to all or part of
the heat pump modular system:
•
Disconnect the primary power source from the building
that feeds electricity to the heat pump. This occurs in
sudden emergencies (usually weather-related) or
planned maintenance shut-downs.
•
If equipped, press the panel disconnect switch on the
exterior door of the heat pump's main power
distribution panel.
•
Move the circuit breaker switch to the OFF position
(CB-1 and CB-2, etc.) on the power distribution panel.
This cuts power to all of the heat pump 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 heat pump modules.
•
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 heat pump
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 heat pump is equipped with high efficiency compact
brazed plate heat exchangers (BPHE). 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–
36
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
Table 6. Water quality guidelines (continued)
Element /Compound/Property
2–
(HCO
) / (SO
)
3–
4
(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 heat pump 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 Heat Pump.
Note: Trane will not validate the heat pump warranty if the
proper water/glycol mixture composition and quality
is not maintained.
Protect the heat pump from freezing, particularly if the heat
pump has a set point that is lower than the freezing point of
the water/glycol mixture in the heat pump. The heat pump
is designed to operate with a maximum propylene glycol
concentration of 40%. See
the heat pump when operating with other glycol
concentrations.
Table 7, p. 37
shows the capacity reduction and the
pressure drop that occurs when higher concentrations of
glycol are used.
Maintain Glycol Level
When the heat pump has a water set point that is below the
freezing point of the water/glycol in use, take precautions
against freezing.
The glycol concentration should be based on the lowest
fluid design temperature. See
guidelines for adding propylene glycol.
Value/Unit
> 1.5
> 0.5
< 200 ppm
Table 7, p.
37, for the effects on
Table 8, p.
38, provides
ARTC-SVX006A-EN
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