Bananza UHD 150 series Operation Manual - page 30
Manual is about: tubular duct furnace standard range
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10.4 UHD[X][S][R] Series Ladder Wiring Diagram for Single Stage Gas Valves
IMPORTANT:
For field wiring into service junction box, or if any of the original wire supplied with the heater
must be replaced, it must be replaced with wiring material having a temperature rating of at least 221° F
(105° C) and 600 V. For supply connections, use No. 14 AWG or larger wires.