NOTE: The Manual Override Board with switches was previously
available on units before April 2021.
Units built after April 2021 do not include this board.
For testing and during start-up each gForce unit is provided with manual override slide switches. There
are seven (7) slide switches. One for each of the following functions:
Figure 13 Manual Override Switch Board
All automatic control is disabled but the safety switches remain functional. Simply slide the manual
switches to energize the fan, compressor(s), humidification, reheat and other functions (as applicable).
The fan speed of the Electronically Commutated (EC) plug fan motor can be adjusted from 0 to 10 volts
DC by adjusting the potentiometer at the left of the Fan Speed switch. The fan speed will increase 10%
of the fan base speed for each one (1) volt adjustment (e.g., one (1) volt equals 10% speed). At ten
(10) volts the motor is at full speed.
WARNING: Do not leave the unit in manual override. Slide the switches to
the OFF position when completing testing and/or start-up. An alarm will be
activated if units are left in the ON position.
Plug Fan Current Sensing Switch
Unit with backward curve plenum fans with electronically commutated (EC) motor (plug fan) use a
current sensing relay (CT) as a safety to alarm when the air flow is unusually low or no air flow. See
section 9.15 Current Sensing Switch Adjustment for more information regarding switch adjustment.
To Next Page
Loading...
