Sterling TUBULAR GAS FIRED DIRECT SPARK PROPELLER UNIT HEATERS GG-30 - Manual (Page 13)

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Figure 10C - Tubular Propeller Units 60-120 with Natural and Propane (LP) Gas
with Optional Two Stage Gas Control and UT Control Board
ELECTRICAL CONNECTIONS (continued)
NOTICE: See Figures 7, 8, 9, 10B, 10C, 11B
and 11C for connecting the thermostat to the
unit heater. If using a standard low voltage
thermostat with a sub-base switch for fan
control, connect the G terminal of the thermostat
to the G terminal of the unit heater.