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Figure 28. Flue assembly
Flue Extension
(20-25 Ton N/A)
(30 Ton 13" Long)
(40, 60, 70, 75 Ton 25" Long)
(50-55 Ton 37" Long)
(90-130 Ton 37" Long)
Vent Cap
Assembly
Heat Section
Vertical Support
General Coil Piping and
Connection Recommendations
Proper installation, piping, and trapping is necessary to
ensure satisfactory coil operation and to prevent
operational damage:
Note: The contractor is responsible for supplying the
installation hardware.
☐ Support all piping independently of the coils.
☐ Provide swing joints or flexible fittings on all
connections that are adjacent to heating coils to absorb
thermal expansion and contraction strains.
☐ Install factory supplied control valves (valves ship
separately).
NOTICE
Connection Leaks!
Failure to follow instructions below could result in
damage to the coil header and cause connection
leaks.
Use a backup wrench when attaching piping to
coils with copper headers. Do not use brass
connectors because they distort easily.
☐ When attaching the piping to the coil header, make the
connection only tight enough to prevent leaks.
Maximum recommended torque is 200 foot-pounds.
NOTICE
Over Tightening!
Failure to follow instructions below could result in
damage to the coil header.
Do not use teflon-based products for any field
connections because their high lubricity could
allow connections to be over tightened.
☐ Use pipe sealer on all thread connections.
RT-SVX072D-EN
Mounting Brackets
(20-25 Ton (1))
(30 Ton (2))
(40-130 Ton (4))
Pipe Clamp
Flue Tube
☐ After completing the piping connections, seal around
pipe from inner panel to outer panel.
Hot Water Heat Units (SLH_)
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 3–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 .
Use the following guidelines to enhance both the
installation and operation of the "wet heat" system.
Figure 29, p. 47
configuration for the hot water coil.
coil connection sizes.
Note: The valve actuators are not waterproof. Failure to
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
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. The Type "W" hot water coil used in SLH_ 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
NOTICE
Leakage!
Failure to follow instructions below could result in
equipment damage.
Properly seal all penetrations in unit casing from
inner to outer panel in order to prevent
unconditioned air from entering the module, as
well as prevent water from infiltrating the
insulation.
illustrates the recommended piping
protect the valve from moisture may result in the
loss of heating control.
Figure 29, p.
47.
header, using the tapped pipe connection
Installation
Table 21, p. 46
lists the
45
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