Trane IntelliPak WEHE Series Installation, Operation And Maintenance Manual Download

Page: 38 / 123

Installation

RT-SVX35H-EN

Hot Water Heat Units (WLHE)

Hot water heating coils are factory installed inside the
heater section of the unit. Once the unit is set into place,
the hot water piping and the three way modulating valve
(factory provided, field installed) must be installed. The
valve can be installed inside the heat 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 shown in

Figure 4, p. 19

Figure 8, p. 23

Following the guidelines listed below will enhance both
the installation and operation of the "wet heat" system.

Figure 22, p. 39

illustrates the recommended piping

configurations for the hot water coil.

Table 10, p. 38

lists

the coil connection sizes.

Note:

The valve actuators are not waterproof. Failure to
protect the valve from moisture may result in the
loss of heating control.

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 the strains of
expansion and contraction.)

3. All return lines and fittings must be equal to the

diameter of the "outlet" connection on the hot water
coil.

4. Install a "Gate" type valve in the supply branch line as

close as possible to the hot water main and upstream
of any other device or takeoff.

5. Install a "Gate" type valve in the return branch lineas

close as possible to the return main and down stream
of any other device.

6. Install a strainer in the hot water supply branch as

shown in

Figure 22

7. Install the 3-way valve in an upright position, piped for

valve seating against the flow. Ensure that the valve’s

location lends itself to serviceability.

8. The Type "W" hot water coil used in WLHE units is self-

venting only when the tube water velocity 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;

or,
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.

9. Install a "Globe" type valve in the Bypass line as shown

Figure 22, p. 39

Steam Heat Units (WSHE)

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.

Important:

To maintain the designed degree of pitch for
the coil, the unit must be installed
absolutely level.

Once the unit is set into place, the steam piping and the
two way modulating valve (factory provided, field
installed) 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
shown in

Figure 4, p. 19

Figure 8, p. 23

Following the guidelines listed below will enhance both
the installation and operation of the "wet heat" system.

Figure 24, p. 40

illustrates the recommended piping

configurations for the steam coil.

Table 10, p. 38

list the

coil connection sizes.

Figure 21. Flu assembly

Table 10. Connection sizes for hot water & steam coil

(a)