Trane UV-SVN02B-EN, Installation Operation & Maintenance, Page: 27 / 52

UV-SVN002-EN 27
Installation
Steam Piping
When air, water or another product is
heated, the temperature or heat trans-
fer rate can be regulated by a modulat-
ing steam pressure control valve. Since
pressure and temperature do not vary
at the same rate as load, the steam
trap capacity, which is determined by
the pressure differential between the
trap inlet and outlet, may be adequate
at full load, but not some lesser load.
There are detailed methods for deter-
mining condensate load under various
operating conditions. However, in most
cases this is not necessary if the coils
are piped as shown in
Figure 27 .
Follow the procedure documented in
the ASHRAE Systems Handbook,
Steam Systems.
Vacuum Equalizer
H= 12"
minimum
F&T Trap
See text for sizing
Gravity flow to
vented receiver
Coil
To Condensate
return
Temp. Regulating Valve
Figure 27: Steam Piping
Modulating Water Valves
(Option)
The actuator on the valve is a
24V, 3-point floating valve. The actuator
can be easily removed from the valve
body by pressing in on the locking tab
and rotating the actuator 45
O counter-
clockwise (See Figure 28a). The 2-way
valves are bi-directional flow. The 3-
way valves can be mixing or diverting
(See Figure 28b).
NOTE: The actuator must be removed
if soldering is being conducted near
the valve. High heat may cause dam-
age to the actuator’s plastic
body/mechanisms.
On applications without factory
installed piping packages (Option), it is
important to remove the cartridge
assembly from the valve body with the
provided tool (Figure 29).
Closed
Open
A
B
A
B
AB<->B
AB
B
AB<->A
A
AB
Figure 28b: Steam Piping
Figure 28a: Remove modulating valve
actuator by pressing in tab (inset) and
turning actuator 45
O counterclockwise.
Two-way
valve
Three-way
valve