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Rack Furnace
HD Rack assemblies employ a Vernier staging modulating
Figure 83: Typical Rack Distribution Wiring
control that modulate gas flow up and down to a lead
modulating furnace to account for varying heat requirements
during operation. Additional slave furnaces have two stage
controls which are activated by relays on the staging control to
meet higher heating requirements. As slave units are brought
on line, the modulating heater gas supply is reduced to meet
the system heat demand. Controls are pre-programmed
depending on the number of furnaces in the system. The
modulating heater is always the top heater.
Figure 84: Typical Vernier Control Wiring
IM 777-18 • SKYLINE OUTDOOR AIR HANDLER
54
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