17
Condensate Drain
Install a trapped condensate drain line to unit connection as
shown in Fig. 11
.
The unit drain connection is a PVC stub. (See
Fig. 12.) Some areas may require an adapter to connect to
either galvanized steel or copper pipe. For these applications,
install a field-supplied threaded PVC adapter.
NOTE: A trap must be installed in the condensate drain line to
ensure that the static pressure of fans is balanced with the water
column in the drain line and that condensate can drain com
-
pletely from pan. Without a trap, air can be drawn up drain line
until water level in condensate pan becomes equal to static
pressure created by fans, preventing complete drainage. Condi
-
tions will worsen as filters become dirty.
Install clean-out plugs in trap. Pitch drain line downward to an
open floor drain or sump. Provide service clearance around
drain line to permit removal of unit panels. Observe all local
sanitary codes.
As shipped, the unit’s condensate drain pan is NOT sloped to
-
wards the drain connection. The pan slope must be changed to
pitch towards the side of the unit with the drain connection.
(See Fig. 12.) Loosen the 2 screws next to the drain outlet at
both ends of the unit, push drain pan down in the slots near the
drain connection, and up in the slots on the opposite end. Re-
tighten screws. The pan should have a pitch of at least 1/4 in.
over its length toward the drain connection.
Fig. 11 — Condensate Drain
Fig. 12 — Drain Pan Slope Adjustment
Fan Motors and Drives
Motor and drive packages are factory installed in all units. The motor
and drive packages consist of the following items:
1 — fan motor
1 — adjustable motor pulley
1 — fan pulley
1 — fan belt
(524J*07A-12A, 524J*07H-12H units)
2 — matched fan belts
(524J*14A-16A, 524J*16H units)
For instructions on changing fan rotation, changing drive speeds and
adjusting drives, see “Pulley and Drive Adjustment” on page 26.
Power Supply and Wiring
Check the unit data plate to ensure that available power supply
matches electrical characteristics of the unit. Provide a disconnect
switch with an integrated lock-out feature of size required to provide
adequate fan motor starting current. See Tables 10-13 for unit
electrical data. See Table 14 for fan contactor coil data.
3” MIN.
[76]
NOTE: Dimensions in [ ] are in millimeters
WARNING
Failure to follow this warning could result in personal
injury or death.
Do not use gas piping as an electrical ground.
Unit cabinet must have an uninterrupted, unbroken
electrical ground to minimize the possibility of personal
injury if an electrical fault should occur. This ground may
consist of electrical wire connected to unit ground lug in
control compartment, or conduit approved for electrical
ground when installed in accordance with NEC (National
Electrical Code); ANSI/NFPA 70, latest edition (in Canada,
Canadian Electrical Code CSA [Canadian Standards
Association] C22.1), and local electrical codes.
Adjustment Slots
(Both Ends of Unit)
PVC Stub Unit
Drain Connection
