Modine Manufacturing VFV Installation And Service Manual page 5

INSTALLATION
Units with Piping Package (Digit 21=D or H and 22=D or H)
1. Chilled water and hot water piping packages are supplied
factory assembled and installed to the coil. All piping
packages include the following: control valve, shut-off
valves, strainer, circuit setter, PT ports, and balancing valve
(when 3-way control valve is selected).
2. Piping package terminations are threaded drop ear
connections, and are 3/4" for chilled water and 1/2" for hot
water. Drop ear connections are attached to fixed plates,
and along with the coil provide support for the piping
package.
3. Piping package termination locations are set such that field
piping can be routed through the bottom knock out, back
knock out, or out the side of the unit.
4. See Figure 20.1, Figure 20.2, Figure 22.1 & Figure 22.2 for
supply and return connections.
Figure 5.1 - Typical 2-Way Piping Installation
Figure 5.2 - Typical 3-Way Piping Installation
Piping Installation – Direct Expansion (DX)
Coils
1. Units with DX evaporator coils contain the refrigerant
R-410A. Review the R-410A Material Safety Data Sheet
(MSDS) for hazards and first aid measures.
2. Refrigerant charging should only be carried out by an EPA-
certified air conditioning contractor.

Note:
R-410A refrigerant is the only approved refrigerant for
this system. The unit should be piped up in accordance
with good refrigeration and/or plumbing practices.
See Figure 17.1 through Figure 17.2, for suction and liquid
line connections. For units with a heating pipe package, see,
Figure 21.1 through Figure 21.4, for suction and liquid line
connections.
The outdoor condensing unit must be connected to the indoor
unit coil using field supplied refrigerant grade (ACR) copper
tubing that is internally clean and dry. Units should be installed
only with the tubing sizes for the approved system combination
as specified in Table 24.1.
Condensing unit is typically factory charged for a 15-foot lineset.
For additional lineset lengths please refer to manufacturer's
charging chart.
See the installation and maintenance manual provided with the
condensing unit for installation, evacuation and system charge
information.
Piping Installation - Steam Coils
Do not operate the units within steam pressure greater than
10 psig. Steam pressure must be 10 psig or lower to avoid
excessive discharge air temperatures that could cause burns
or personal injury.
1. Steam coils are supplied from the factory with 1" NPT
connections
2. A steam trap should be provided with a trap of sufficient
size and capacity to pass a minimum of two times the
normal condensate released by the unit at the minimum
differential pressure in the system.
3. See Figure 19.1 and Figure 19.2 for supply and return
connections. For units with a heating pipe package,
see Figure 23.1 and Figure 23.2 for supply and return
connections.
Piping Insulation
Standard Units
Chilled water and condensate pipes should be insulated right
up to the coil to prevent condensation which can damage
objects located below the piping. Chilled water valves must also
be insulated to prevent sweating. Hot water pipes should be
insulated to reduce heat loss and to prevent overheating of the
end compartment.
Units with Piping Package (not available on Ceiling
Mounted units)
Chilled water piping package will not be insulated except
when piping is routed through pipe tunnel. Chilled water
piping package shall be positioned over drain pans to catch
condensate that forms on piping.
14-500.5
CAUTION
CAUTION
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