Installation
RT-SVX24J-EN 73
• After completing the piping connections, seal around
pipe from inner panel to outer panel.
Hot Water Heat Units
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 factory provided three way
modulating valve 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 illustrated in Figure 50, p. 74.
Following the guidelines listed below will enhance both
the installation and operation of the “wet heat” system.
Figure 51, p. 75 illustrates the recommended piping
configuration for the hot water coil. Table 20 on page 74
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 line as
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 51, p. 75.
7.
Install the 3-way valve in an upright position, piped for
valve seating against the
flow. Ensure that the valve
location lends itself to serviceability.
8. TheType “W” hot water coil 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
in Figure 51 on page 75.
Steam Heat Units
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 50, p. 74.
Following the guidelines listed below will enhance both
the installation and operation of the “wet heat” system.
Figure 52, p. 75 illustrates the recommended piping
configurations for the steam coil. Table 20, p. 74 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. Install the 2-way valve in an upright position. Ensure
that the valve's location lends
itself to serviceability.
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 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.
6. Install a 1/2" 15 degree swing-check vacuum breaker at
the
top of the return
coil header using the tapped pipe
connection. Position the vacuum breaker as close to
the coil as possible.
Note: Vacuum breakers should have extended lines from
the vent ports to the atmosphere or connect each
vent line to the return pipe on the discharge side of
the steam traps.
CAUTION
Leakage!
Properly seal all penetrations in unit casing. Failure to
seal penetrations from inner panel to outer panel could
result in unconditioned air entering the module, and
water infiltrating the insulation, resulting in equipment
damage.
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