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IM 1287-4 • REBEL APPLIED ROOFTOP 104 www.DaikinApplied.com
Unit Maintenance
Problem
Cause
Remedy
Terminals Overheating
Loose connections
Check for obvious signs of terminal and wiring overheating
Tighten and repair as required|
All terminals should be checked and tightened once a year or at the start of every heating
season
Improperly sized wire
All incoming wiring should be sized in accordance with NEC Article 424
High voltage
Check nameplate voltage is equal to line voltage
Contactor Hum or Chatter
Low control voltage
Check nameplate voltage is equal to line voltage
Check control voltage, it should not be less than 90% of the contactor coil voltage
Dirt on armature of holding coil
Clean contactor armature with low air pressure and a stiff brush
Defective contactor
Replace contactor
Electric Heater Step Controller
The S5 Series step controller is a microcomputer-based stage
controller designed to provide low cost precise control for
multi-stage applications. Common applications are HVAC duct
heaters, industrial process air heaters and circulation heaters.
• Low voltage 24 VAC microcomputer-based stage
controller
• Capable of controlling 24 VAC loads
• 5 stage controller with a pulsed 10 VDC vernier stage
rated at 100 mA.
• Up to 10 stages of control when using a slave unit
Stage Sequencing
The S5 Series step controller operates in a linear control mode.
The first stage ON will be the last stage OFF (LIFO).
For example: 1,2,3,4,5 ON then 5,4,3,2,1 OFF.
Vernier Operation
The S5 Series step controller supports a 10 VDC pulsed
vernier stage to operate a slave SCR/SSR controller. This will
result in more precise control than is otherwise possible with
a standard on-off step controller. The slave SCR/SSR power
controller provides proportional control (0-100% load) between
the switching of the step controller stages:
Figure 153: Sequence Control without Vernier
Figure 154: Sequence Control without Vernier
Содержание Rebel Applied DPSA
Страница 15: ...Introduction www DaikinApplied com 15 IM 1287 4 REBEL APPLIED ROOFTOP Figure 17 VFD Inverter Box Components ...
Страница 109: ...Unit Maintenance www DaikinApplied com 109 IM 1287 4 REBEL APPLIED ROOFTOP Figure 159 10kW 50kW Full SCR Control ...
Страница 144: ...IM 1287 4 REBEL APPLIED ROOFTOP 144 www DaikinApplied com Furnace Wiring Diagrams Figure 178 600 MBH 2 Stage ...
Страница 145: ...Furnace Wiring Diagrams www DaikinApplied com 145 IM 1287 4 REBEL APPLIED ROOFTOP Figure 179 600 MBH 4 Stage ...
Страница 147: ...Figure 181 600 MBH 5 1 Modulation 400 MBH and 600 MBH 10 1 Modulation ...
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