5
2. Precautions
• Ensure that the unit is grounded as explained in Appendix B: Electrical Grounding, page 18.
• It is extremely important that the Inlet/Tunnel switch be set correctly! Failure to do so can cause major damage to your
flock/herd or physical plant. Refer to Inlet or Tunnel Air Source, page 7.
3. Introduction to the RBU-27 SE
The RBU-27 SE system is a backup controller that operates during a primary controller failure or during extreme
temperatures. The RBU-27 SE has 27 heavy duty relays, up to five thermostats and four delay times. The RBU-27 SE is
a five stage backup consisting of:
o one heating stage having two heat zones
o three cooling stages
o one cool pad stage
• up to four cool pad pumps
• temperature independent
Each stage is powered from its own circuit breaker. LED indicators on the front panel indicate which stages are currently
active.
o To prevent overheating, all four heater relays are defined as Off or Auto.
o To ensure cooling in all situations, all 16 cooler relays are defined as On or Auto (two fans can be set to On,
Off, or Auto).
The RBU-27 SE can be expanded to include up to four heaters, four cool pads, and 16 fans. The unique design provides
a greater control in choosing the ventilation method, testing equipment, and emergency climate control (Latch On/Off
function).
Figure 1 shows a pre-wired relay; the relay’s logic serves as the RBU-27 SE’s “non-electronic brain”. In addition, the relay
is highly resistant to lightening and other transient electrical disturbances.
Figure 1: Pre-Wired Relays
NOTE: While the RBU-27 SE is designed to work with Rotem’s Platinum Controllers, it supports all Rotem Controllers.
o Switch Functions
o RBU-27 SE Functions
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