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Installation
PLUS
DSS = 1.15 X (LOAD 1 + LOAD 2 + LOAD 4)
Use the larger value of the two calculations to size the electrical service.
•
DSS = 1.15 X LOAD3 for the Electric heater AND Calculation #1 for the Refrigeration Components
Field Installed Control Wiring
Hazardous Voltage!
Disconnect all electric power, including remote disconnects before servicing. Follow proper
lockout/tagout procedures to ensure the power can not be inadvertently energized. Failure to
disconnect power before servicing could result in death or serious injury.
Proper Field Wiring and Grounding Required!
All field wiring MUST be performed by qualified personnel. Improperly installed and grounded
field wiring poses FIRE and ELECTROCUTION hazards. To avoid these hazards, you MUST
follow requirements for field wiring installation and grounding as described in NEC and your
local/state electrical codes. Failure to follow code could result in death or serious injury.
The Rooftop Module (RTM) must have a mode input in order to operate the rooftop unit. The
flexibility of having several system modes depends upon the type of sensor and/or remote panel
selected to interface with the RTM. An overall layout of the various control options available for a
Constant Volume application, with the required number of conductors for each device, is illustrated
in
of conductors for a Variable Air Volume application.
Note: All field wiring must conform to NEC guidelines as well as state and local codes.
The various field installed control panels, sensors, switches, and contacts discussed in this section
require both AC and DC consideration. These diagrams are representative of standard applications
and are provided for general reference only. Always refer to the wiring diagram that shipped with
the unit for specific electrical schematic and connection information.
Controls Using 24 VAC
Before installing any connecting wiring, refer to
access locations provided on the unit and
1. Use copper conductors unless otherwise specified.
2. Ensure that the AC control wiring between the controls and the unit's termination point does
Note: Resistance in excess of 3 ohms per conductor may cause component failure due to
3. Be sure to check all loads and conductors for grounds, shorts, and mis-wiring.
Table 28. AC Conductors
Distance from unit to control
76
Calculation #3 - SEHL (200/230 Volt) 20 - 75 Ton Dual Power Source Units
Figure 34, p.
69.
Figure 37, p. 85
not exceed three (3) ohms/conductor for the length of the run.
insufficient AC voltage supply.
000-460 feet
461-732 feet
733-1000 feet
WARNING
WARNING
illustrates the various control options with the required number
Figure 9, p. 34
Table 28
for AC conductor sizing guidelines, and;
Recommended wire size
18 gauge
16 gauge
14 gauge
and
Figure 10, p. 36
for the electrical
RT-SVX36G-EN
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