Steam Heat Units (Ssh_) - Trane IntelliPak SAHL Series Installation, Operation And Maintenance Manual

7. Install the 3-way valve in an upright position, piped for valve seating against the flow. Ensure
8. The Type "W" hot water coil used in SLHL units is self-venting only when the tube water velocity
or,
9. Install a "Globe" type valve in the Bypass line as shown in
Table 20. Connection Sizes for Hot Water and Steam Coil
Unit Model and Size
(a) Type W coils—with center offset headers—are used in SLH_ units; Type NS coils are
(b) See Digit 9 of the unit model number to determine the heating capacity.
(c) SSH_ - 40 to 89 Ton units have multiple headers.

Steam Heat Units (SSH_)

Steam heating coils are factory installed inside the heater section of the unit. The coils are pitched,
within the units, to provide the proper condensate flow from the coil. To maintain the designed
degree of pitch for the coil, the unit must be level.
Once the unit is set into place, the steam piping and the factory provided two way modulating valve
must be installed. The valve can be installed inside the heater section or near the unit. If the valve
is installed in a remote location, use field supplied wiring to extend the control wires from the
heater section to the valve. Two access holes are provided in the unit base as illustrated in
Figure 10, p.
Following the guidelines listed below will enhance both the installation and operation of the "wet
heat" system.
Figure 31
Table 20
Note: The valve actuators are not waterproof. Failure to protect the valve from moisture may
1. Support all field-installed piping independently from the heating coil.
2. Use swing joints or flexible connectors adjacent to the heating coil. (These devices will absorb
3. Install the 2-way valve in an upright position. Ensure that the valve's location lends itself to
4. Pitch the supply and return steam piping downward 1" per 10' of run in the direction of flow.
5. All return lines and fittings must be equal to the diameter of the "outlet" connection on the
RT-SVX36G-EN
that the valve's location lends itself to serviceability.
exceeds 1.5 feet per second (fps). If the tube velocity is less than 1.5 feet per second, either:
a. install an automatic air vent at the top of the return header, using the tapped pipe
connection;
b. vent the coil from the top of the return header down to the return piping. At the vent
connection, size the return piping to provide sufficient water velocity.
Heat Section
Capacity
SLH*-20 to 130 High or Low Heat
SSHL-20 to 36 High or Low Heat
(c)
SSHL-40 to 89 High Heat Low Heat
SSHK-90 to 130
used in SSH_ units.
36.
and Figure 32 illustrate the recommended piping configurations for the steam coil.
lists the coil connection sizes.
result in the loss of heating control.
the strains of expansion and contraction.)
serviceability.
steam coil(s). If the steam trap connection is smaller that the coil "outlet" diameter, reduce the
pipe size between the strainer and the steam trap connections only.
Coil Connections
(diameter in inches)
(b)
Supply
2-1/2"
3"
3"
(c)
Low Heat 1-1/2"
Figure 29 and Figure
(a)
Return
2-1/2"
1-1/4"
1-1/2"
1"
Installation
38.
63