Filter
Top Products
36
Field Wire Routing
UNIT SIZES 030-050 — Field wiring can be brought into the
unit through the basepan and roof curb or through the corner
post in the side of the unit next to the control box.
A 3
1
/
2
-in. NPT coupling for field power and a
3
/
4
-in. NPT
coupling for 24 v control wiring are provided in the basepan.
There are two 4
5
/
8
-in. knockouts in the corner post for field
power wiring.
If field power wiring is brought through the roof curb, route
wiring out through one of the 4
5
/
8
-in. knockouts to the field-
supplied disconnect and then back into the unit through the oth-
er knockout. See Fig. 39 for recommended disconnect location.
If power wiring is brought through the side of the unit, route
wiring from field-supplied disconnect through top 4
5
/
8
-in.
knockouts into unit.
If control wiring is to be brought in through the side of the
unit, a
7
/
8
-in. diameter hole must be drilled in the corner post
next to the control box.
UNIT SIZES 055-105 — Field wiring is brought into the unit
through the bottom of the control box. Wiring can be brought
through the roof curb through field-supplied watertight connec-
tions. See Fig. 40 and 41.
A 4
5
/
32
-in. hole for field power wiring and a
7
/
8
-in. hole for
24 v control wiring are provided in the bottom of the control
box. Field-supplied couplings must be used when routing wir-
ing into the control box.
See Fig. 40 and 41 for recommended disconnect location.
Field Electrical Connections
POWER WIRING — Units are factory wired for the voltage
shown on the unit nameplate. The main terminal block is suit-
able for use with aluminum or copper wires. Maximum wire
size varies according to disconnect size.
Units Without Factory-Installed Disconnect
— When install-
ing units, provide a disconnect per NEC (National Electrical
Code) of adequate size (MOCP [Maximum Overcurrent Pro-
tection] of unit is on the informative plate). All field wiring
must comply with NEC and all local codes. Size wire based on
MCA (Minimum Circuit Amps) on the unit informative plate.
See Fig. 42 for power wiring connections to the unit power ter-
minal block and equipment ground. Maximum wire size is two
(2) 500 MCM (thousand circular mils) conductors per pole.
APPLY RTV IN THE
INDICATED AREAS
AND BOTH ENDS OF
BOTTOM FILTER ROW
SEE DETAIL Z
DETAIL Z
SCALE 3:4
Fig. 38 — Large Economizer Hood Assembly
IMPORTANT: The 48ZN,ZW,Z8 units generate, use,
and can radiate radio frequency energy. If units are not
installed and used in accordance with these instructions,
they may cause radio interference. They have been
tested and found to comply with limits of a Class A
computing device as defined by FCC (Federal Commu-
nications Commission) regulations, Subpart J of Part 15,
which are designed to provide reasonable protection
against such interference when operated in a commercial
environment.