Trane R Series, Installation Operation & Maintenance

Page: 38 / 188

38 RLC-SVX07A-EN
Installation - Mechanical
Condenser Water Piping (for RTWA Units Only)
Condenser water inlet and outlet types, sizes and locations are given in
Figures
3 to Condenser pressure drops are shown in Figures 17 and 18 .
Condenser Piping Components
Condenser piping components and layout vary, depending on the location of
connections and the water source.
Figure 19 illustrates typical piping compo-
nents for a well water (or city water) condensing source. Typical components
for a cooling tower condensing source are shown in
Figure 20 .
Condenser piping components generally function identically to those in the
evaporator piping system, as described in
"Evaporator Water Piping (for
RTWA and RTUA Units Only)" on Page 31 . In addition, cooling tower systems
should include a manual or automatic bypass valve that can alter the water
flow rate, to maintain condensing pressure. Well water (or city water)
condensing systems should include a pressure reducing valve and a water
regulating valve, as shown in
Figure 19 .
The pressure reducing valve should be installed to reduce water pressure
entering the condenser. This is required only if the water pressure exceeds
150 psig. This is necessary to prevent damage to the disc and seat of the
water regulating valve that can be caused by excessive pressure drop through
the valve and also due to the design of the condenser. The condenser
waterside is rated at 150 psi.
CAUTION
Equipment Damage!
To prevent damage to the condenser or regulating valve, the
condenser water pressure should not exceed 150 psig.
The optional water regulating valve maintains condensing pressure and
temperature by throttling water flow leaving the condenser in response to
compressor discharge pressure. Adjust the regulating valve for proper
operation during unit start-up.
This valve is not used in cooling tower applications. Cooling towers, however,
may require the use of a three-way, pilot-operated regulating/bypass valve, to
maintain balance between cooling tower water temperature and condensing
pressure.
NOTE: 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
The condenser shells can be drained by removing the drain plugs from the
bottom of the condenser heads. Also, remove the vent plugs at the top of the
condenser heads to facilitate complete drainage.
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.