Installation and Maintenance Manual

Installation—Mechanical
UNT-SVX07D-EN 37
Water Piping Connections to Factory-Installed
Piping Package
Before installing water piping supply and return lines to
factory piping package, note the following items.
• All piping connections are 5/8-inch O.D. (1/2-inch
nominal) female copper connections.
• The fan-coil supply and return piping should not
interfere with
the auxiliary drain pan or condensate
line. See “Condensate Drain,” p. 37 for more
information.
• The installer must provide adequate piping system
filtration and w
ater treatment.
• If the unit has a factory deluxe piping package, the
pi
ping includes a strainer with a 20-mesh size screen,
which allows minimal protection from debris.
Therefore, clean the strainer regularly.
Note: M
aintain a minimum distance of one foot between
the reduction fitting for the
1
/
2
-inch diameter line
and the fan-coil piping connections.
1. The factory piping package ships with brackets to
adequately support the piping during shipment.
Remove these brackets before connecting water piping
to the unit.
2. Close the piping end valves to the
fully open position
to prevent damage to the valve seat during brazing.
3. Remove the auxiliary drain pan,
if it is in place, to
prevent exposure to dripping solder or excessive
temperatures.
4. Solder water piping connections to supply and return
end
connections. Avoid overheating factory soldered
joints to prevent the possibility of leakage.
5. Insulate fan-coil piping to auxiliary drain pan
co
nnections and any piping that is not above the
auxiliary drain pan.
Condensate Drain
1. De-burr the pipe end before making the connection to
the drain pan.
2. Connect a 7/8-inch O.D. copper pi
pe or tube, with a 0.20
inch wall thickness, to the auxiliary drain pan. This
should be a mechanical connection that allows easy
removal of the auxiliary drain pan when servicing the
piping end pocket.
3. Slide the copper pipe over the drain pan nipple and
tighten the collar on the pi
pe with a hose clamp
(installer supplied).
Maintain a continuous drain line pitch of one inch per ten
feet of drain line run to provide adequate condensate
drainage. Extend the drain line straight from the drain pan
a minimum distance of six inches before making any turns.
The installer must provide proper support for the drain line
to prevent undue stress on the auxiliary drain pan.
Install a secondary overflow drain line if necessary by
punching out the overflow drain nipple on the auxiliary
drain pan. Next, place a 3/8-inch inside diameter flexible
plastic tube over the nipple and secure with a field
supplied hose clamp.
Note: The installer is responsible for adequately
insulating field piping. See the “External Insulating
Requirements section for more information.
Condensate Overflow Detection Device
The condensate overflow detection device is an option on
fan-coil units with either a Tracer ZN010, ZN510, ZN520,
UC400, or the customer-supplied control interface. The
float switch, mounting bracket, and coiled leads ship
attached inside the piping end pocket of the unit. Install the
switch by placing the hole or slot in the bracket over the
condensate overflow drain (of the auxiliary drain pan) with
the switch float extending over the pan. Secure the drain
pan by attaching the pan’s bracket with the factory
provided clip. See Figure 3 and Figure 4.
Figure 3. Condensate float switch installed in
horizontal auxiliary drain pan
Figure 4. Condensate float switch installed in vertical
auxiliary drain pan
UNT-SVX07_-EN.book Page 37 Friday, April 27, 2012 9:40 AM