Technical supplement
25 ton to 50 ton power wiring side penetration for slab-mounted
units
Installing the power wiring through the
side panel of the rooftop unit
1. Locate the first panel downstream from the
control panel that is more than 10 in. (25.4
cm) wide and has the necessary clearances
detailed in Figure 75.
2. Locate the center point 5 in. (12.7 cm)
from the bottom of the panel, and drill the
following two holes:
- Drill one 3.5 in. (8.9 cm) hole for the
installation of a 3 in. (7.6 cm) power
wiring conduit nipple.
- Drill one 1.5 in. (3.8 cm) hole for the
installation of a 1 in. (2.5 cm) control
wire conduit nipple.
3. Install the power and control wiring conduit
nipples with the applicable nuts and proper
seal.
4. Inside the unit, run the wiring along the floor
to the control panel. Drill any additional holes
necessary through internal components, and
install conduit nipples, hardware, and seals as
needed until the wiring reaches the control
panel.
Figure 74: The control panel on a rooftop
Note:
A 40 ton to 50 ton unit is shown for
reference.
Figure 75: Bend radius for power wiring
Note:
a. This distance is determined by the
data in Table 312.6 (A) in the 2017
National Electric Code (NFPA 70).
b. This distance is determined by the
data in Table 312.6 (B) in the 2017
National Electric Code (NFPA 70).
Tempmaster
®
Omni™ Premier 25 Ton to 80 Ton Rooftop Units Installation and Maintenance Guide
106
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