Trane IntelliPak 2 Series, Инструкция по установке, эксплуатации и обслуживанию

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104 RT-SVX24Q-EN
independent algorithms. A cluster will share a common
supply and return duct network.
Low Charge Protection
For each refrigeration circuit, the entering and leaving
evaporator temperatures are used to calculate
superheat. When the calculated superheat exceeds the
Evaporator Temperature Differential Setpoint minus 5°
F but not the Evaporator Temperature Differential
Setpoint, an information only, auto-reset, High
Superheat diagnostic is initiated. If the calculated
superheat exceeds the Evaporator Temperature
Differential Setpoint, a manual reset, low refrigerant
charge diagnostic is initiated and all compressors on
the circuit are locked out.
Hydronic Heat Sequence of Operation
Electrical circuitry for units with steam or hot water
heat is limited to the connections associated with the
modulating valve actuator and the freezestat.
Like the furnaces described earlier, steam and hot
water heat control systems are wired to ensure that
simultaneous heating and cooling do not occur. The
supply fan will cycle “On” and “Off” with each call for
heat during both an occupied and unoccupied period.
Whenever there is a call for heat, tth he e rre ella ay y o on n tth he e h he ea att
m mo od du ulle e energizes. This allows a modulated voltage
signal to be sent to the “Wet” heat actuator. The value
of this signal regulates the flow of steam or hot water
through the coil by positioning the valve stem at some
point between fully closed (6 VDC) and fully open (8.5
VDC).
Freeze Protection
A freezestat is mounted inside the heat section of hot
water and steam heat units to prevent the “wet” heat
coil from freezing during the “Off” cycle.
If the temperature of the air leaving the heating coils
falls to 40°F, the freezesta’st normally open contacts
close, completing the heat fail circuit on the UCM.
When this occurs:
• The supply fan is turned “Off”.
• “Wet” heat actuator fully opens to allow hot water
or steam to pass through the heating coil and
prevent freeze-up.
• A “Low Air Temperature Unit Trip” diagnostic is
displayed on the Human Interface LCD screen.
For heating control settings and time delay
specifications, refer to and
“Trane Startup
Checklist,” p. 186 .
Startup the Unit
Use the following in conjunction with the “Trane
Startup Checklist,” p. 186 , to ensure that the unit is
properly installed and ready for operation. Be sure to
complete all of the procedures described in this section
before starting the unit for the first time.
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☐ Turn the field supplied disconnect switch, located
upstream of the rooftop unit, to the “Off” position.
☐ Turn the 115 volt control circuit switch 1S2 to the
“Off” position. .
☐ Turn the 24 volt control circuit switch 1S3 to the
“Off” position. It is located in the secondary of the
1T2 - 1T5 transformers.
☐ Turn the “System” selection switch (at the Remote
Panel) to the “Off” position and the “Fan” selection
switch (if Applicable) to the “Auto” or “Off”
position.
☐ Check all electrical connections for tightness and
“point of termination” accuracy.
☐ Verify that the condenser airflow will be
unobstructed.
☐ Check the compressor crankcase oil level. Oil
should be visible in the compressor oil sight glass.
The oil level should be 1/2 to 3/4 high in the sight
glass with the compressor “Off”.
☐ Verify that all refrigerant service valves are back
seated on each circuit.
N NO OT TIIC CE E
C Co om mp prre esssso orr D Da am ma ag ge e!!
E Ex xcce essssiiv ve e lliiq qu uiid d a accccu um mu ulla attiio on n iin n tth he e ssu uccttiio on n lliin ne ess
cco ou ulld d rre essu ulltt iin n cco om mp prre esssso orr d da am ma ag ge e..
D Do o n no ott a allllo ow w lliiq qu uiid d rre effrriig ge erra an ntt tto o e en ntte err tth he e ssu uccttiio on n
lliin ne e..
Do not start the unit in the cooling mode if the ambient
temperature is below the following minimum
recommended operating temperature:
Standard unit with or without HGBP — +45°F
N No otte e:: See for minimum outside air temperature.
☐ Check the supply fan belts for proper tension and
the fan bearings for sufficient lubrication. If the
belts require adjustment, or if the bearings need
lubricating, refer to the Service/Maintenance
section of this manual for instructions.
☐ Inspect the interior of the unit for tools and debris.
Install all panels in preparation for starting the unit.
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