Installation and Maintenance Manual

24 UV-SVN03F-EN
Installation—Piping
Piping Installation
Before installation of piping package, the shipping bracket
holding the piping in place, must be removed.
Proper installation of piping is necessary to provide
efficient coil operation and to prevent damage during
operation. Follow standard piping practices and include all
accessories as necessary.
Piping connection knockouts are shown in “Dimensions
and Weights,” p. 11. Field connection types and sizes for
unit coils are listed in Tab l e 8 . These sizes are provided for
field piping connection.
A 7/8 in. OD condensate drain connection is provided on
the chilled water supply end of the unit.
1. Attach a flexible condensate drain hose over the drain
pan connection and secure with a hose clamp.
The drain pan on the vertical is vacuum-molded with a
drain connection and P-trap on the cooling coil,
connection side.
Note: Condensate removal to the main system
should be made through the bottom of the unit
ventilator. If other location for condensate
removal is desired, a specific field cut-out for
the connection should be made in the back of
the unit ventilator. To help avoid cold air
infiltration, the field cut-out should only be
large enough to allow for the condensate hose
to exit the unit.
To field reverse the slope of a vertical unit drain pan:
2. Slide out fan deck (disconnecting the condensate line
and fan plug will release fan deck for sliding).
3. Remove pipe clamp that hold
the p-trap to the drain
pan.
4. Remove clips that hold the drain pan in-place.
5. Lift and rotate the drain pan.
6. Reconnect p-trap to the drai
n pan and replace clips to
secure the pan to the fan deck.
7. After the condensate drain piping has been completed,
c
heck water flow to ensure the system properly carries
and away all condensate accumulation.
Note: A P
-trap is factory supplied in every vertical unit
ventilator.
Trane Piping Packages (Option). Trane Standard
Piping Package includes a 2- or 3-way valve with bypass
balance valve, ball valves, Pete’s plugs and unions. A
strainer and circuit balancing valve are optional.
All union connections should be tightened in the field.
Units are shipped with union connections hand tightened
only in the factory.
Note: All connections made in the field should be sweat
connections.
Piping packages are not shipped insulated. Any insulation
should be provided in the field by the installing contractor.
The auxiliary drain pan (optional) is the main condensate
connection to the unit when specified. The chilled water or
DX coil drain pan will empty into the auxiliary drain pan if
a factory-installed, auxiliary pan is ordered. All field-piping
condensate connections should be made at the auxiliary
drain pan.
Installation Crossover Piping
Crossover piping is available for all hydronic coils. It is
either 1-3/8 in. \[34.9\] or 2-1/8 in. \[54\] in diameter (OD) as
specified by the customer. Crossover piping can be found
in either the left or right hand end pocket. Refer to
“Dimensions and Weights,” p. 11 for dimensional data.
On 4-pipe coils, crossover piping connects to the main
cooling coil.
Factory insulation is provided on all crossover piping.
When a Trane piping package is ordered, it is installed with
the connections made to the supply and return of both the
coil and the crossover piping. However, supply and return
connections must be made in the field when a piping
package is furnished by the installer.
The crossover piping is located at the back of the unit along
the wall and the ends of the piping are flush with the end
of the unit.
Expansion compensation between the piping package and
the crossover piping is achieved using flex hoses rated at
250 psi working pressure. Expansion compensation for
the crossover piping must be handled external to the unit
ventilator.
Split System Units
The following refrigerant piping and interconnecting
wiring instructions apply to unit ventilators with direct
expansion type cooling coils used in conjunction with air-
cooled condensing units. Reference must also be made to
Table 8. Coil data for field piping
Coil type Connection location Field connection size
4-pipe chilled water /
hot water
Left or right (opposite
ends)
7/8 in. OD / 5/8 in. OD
2-pipe changeover coil Left or right 7/8 in. OD
Hot water only Left or right 7/8 in. OD
Steam Left or right 1 in. MPT
Chilled water / electric
heat
Left cooling 7/8 in. OD
Chilled water / steam Left or right 7/8 in. OD / 1 in. MPT
DX Left 7/8 in. suction, 3/8 in.
DX / hot water Left cooling / right
heating
7/8 in. suction,
3/8 in. / 5/8 in. OD
DX / steam Left cooling / right
heating
7/8 in. suction,
3/8 in. / 1 in. MPT
DX / electric heat Left cooling / right
heating
7/8 in. suction,
3/8 in. / NA
UV-SVN03_.book Page 24 Thursday, January 24, 2013 5:27 PM