RLC-SVX09Q-EN
43
NOTICE
Equipment Damage!
Do not exceed 150 psig condenser water pressure as
it could result in damage to the condenser or
regulating valve.
Water Regulating Valve
The Condenser Head Pressure Control Option provides for
a 0 to 10V (maximum range - a smaller range is adjustable)
output interface to the customer’s condenser water flow
device. See Condenser Water Temperature Control Water-
Cooled Series R
®
Chillers Model RTWD Engineering
Bulletin (RLC-PRB021*-EN) for further details regarding
condenser water temperature control.
The following guidelines must be met for adequate oil
circulation throughout the system.
• The RTWD requires a minimum pressure differential of
25 psid (172.1 kPA) 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 (0.6°C) temperature rise per
minute up to 55°F (12.8°C).
• The leaving condenser water temperature must be 17°
F (9.4°C) degrees higher than leaving evaporator water
temperature within 2 minutes of start-up. A 25°F (13.9°
C) temperature differential must be maintained
thereafter. (This differential requirement is lessened by
0.25°F [0.14°C] for every 1°F [0.6°C] that the leaving
condenser water temperature is above 55°F [12.8°C].)
If the above guidelines cannot be met, then some form of
condenser water temperature control must be used.
Notes:
• Plugged tees are installed to provide access for
chemical cleaning of the condenser tubes.
• Condenser piping must be in accordance with
all applicable local and national codes.
Condenser Drains and Vents
NOTICE
Waterbox Damage!
Failure to follow instructions could result in damage
to the waterbox.
Do not over-tighten or use excessive Teflon® pipe
tape when installing valves, drains, plugs and vents
on waterboxes.
When the unit is shipped, the drain plugs are removed from
the condenser and placed in a plastic bag in the control
panel, along with the evaporator drain plug. The condenser
drains may be connected to suitable drains to permit
drainage during unit servicing. If they are not, the drain
plugs must be installed prior to water pump operation.
The condenser shells can be drained by removing the drain
plugs from the bottom of the condenser heads. Remove
the vent plugs at the top of the condenser heads to
facilitate complete drainage.
Water Treatment
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.
Water Pressure Gauges
Install field-supplied pressure gauges (with manifolds,
when practical) on the units. Locate pressure gauges or
taps in a straight run of pipe, avoid placement near elbows,
and install gauges at the same elevation.
To read manifolded pressure gauges, open one valve and
close the other (depending on the desired reading). This
eliminates errors resulting from differently calibrated
gauges installed at unmatched elevations.
Water Pressure Release Valves
Install a water pressure relief valve in the condenser and
evaporator leaving chilled water piping. Water vessels with
close coupled shutoff valves have a high potential for
hydrostatic pressure buildup on a water temperature
increase. Refer to applicable codes for relief valve
installation guidelines.
Refrigerant Relief Valve Venting
WARNING
Refrigerant under High Pressure!
Failure to follow instructions below could result in an
explosion which could result in death or serious
injury or equipment damage.
System contains oil and refrigerant under high
pressure. Recover refrigerant to relieve pressure
before opening the system. See unit nameplate for
refrigerant type. Do not use non-approved
refrigerants, refrigerant substitutes, or refrigerant
additives.
Installation - Mechanical
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