Trane Optimus RTHD, Installation, Operation And Maintenance Manual

Page: 33 / 96

Installation Mechanical
RTHD-SVX01K-EN 33
Entering condenser water piping.
• Air vents (to bleed air from system)
• Water pressure gauges with shutoff valves
• Pipe unions
• Vibration eliminators (rubber boots)
• Shutoff (isolation) valves. One per each pass
• Thermometers
• Cleanout tees
• Pipe strainer
• Flow switch
Leaving condenser water piping.
• Air vents (to bleed air from system)
• Water pressure gauges with shutoff valves
• Pipe unions
• Vibration eliminators (rubber boots)
• Shutoff (isolation) valve - one per each pass
• Thermometers
• Cleanout tees
• Balancing valve
• Pressure relief valve.
Condenser Water Regulating Valve
The Condenser Head Pressure Control Option provides for
a 0-10Vdc (maximum range - a smaller range is adjustable)
output interface to the customer's condenser water flow
device. The condenser water flow device is typically a
large butterfly type (6" or 8") automatic valve for 200 to 400
Ton chillers.
The following guidelines must be met to ensure adequate
oil circulation throughout the system.
• The chiller must maintain a 23 psid system pressure
differential at all load conditions in order to ensure
adequate oil circulation.
• The entering condenser water temperature must be
above 55°F (12.8°C) or between 45°F (7.2°C) and 55°F
(12.8°C) with a 1°F temperature rise per minute to 55°F
(12.8°C).
• Condenser leaving water temperature must be 17°F
degrees higher than evaporator leaving water
temperature within 2 minutes of startup. A 25°F
differential must be maintained thereafter.
If the above guidelines cannot be met, then some form of
tower water control must be used.
Condenser Water Regulating Valve
Adjustment
A separate Tracer
®
TU Settings Menu tab entitled
“Condenser Head Pressure Control - Setup” that is only
visible if the configuration is selected, contains the
following settings and manual overrides for user
adjustments and commissioning all under one tab:
• “Off State” Output Command (0-10 Vdc 0.1 volt
increments, Default 2.0 Vdc)
• Output Voltage @ Desired Minimum Flow (Adj: 0 to
10.0 in 0.1 volt increments, Default 2.0 Vdc)
• Desired Minimum Flow (Adj: 0- 100% of full flow in 1%
intervals, Default 20%)
• Output Voltage @ Desired Maximum Flow (Adj: 0 to
10.0 in 0.1 volt increments (or finer), Default 10 Vdc)
• Actuator Stroke Time (Min to Max Range Time) (Adj: 1
to 1000 seconds, in 1 second increments, Default 30s)
• Damping Coefficient (adj: 0.1 to 1.8, in 0.1 increments,
Default 0.5)
• Head Pressure Control Override (enumeration of:
disabled (auto), “off” state, minimum, maximum
(100%),) default:disabled (auto). When this setting is
in “disabled (auto)”
The following setting is found in the Setpoints tab:
• Condenser Water Pump Prestart Time
Note: Default value is 0 minutes. When using head
pressure control, this value must be reset to a
minimum of two times the condenser loop volume
(but no less than one minute). Do NOT leave the
value at 0 minutes.
Water Treatment
Using untreated or improperly treated water in these units
may result in inefficient operation and possible tube
damage. Consult a qualified water treatment specialist to
determine whether treatment is needed.
NOTICE
Condenser Damage!
To prevent condenser damage, do not exceed 150 psig
(10.3 bar) water pressure for standard water boxes.
Maximum pressure for high pressure water boxes is
300 psig (20.7 bar). Refer to digit 18 of the Model No. To
prevent tube damage, install a strainer in condenser
water inlet piping. To prevent tube corrosion, ensure
that the initial water fill has a balanced pH.
NOTICE
Proper Water Treatment Required!
The use of untreated or improperly treated water could
result in scaling, erosion, corrosion, algae or slime. Use
the services of a qualified water treatment specialist to
determine what water treatment, if any, is required.
Trane assumes no responsibility for equipment failures
which result from untreated or improperly treated
water, or saline or brackish water.