Grain Systems PNEG-377 - Manual (Page 55)

55
Fan and Heater
FAN PARTS
Figure 4: The HF-7318 control board.
For Units Using
HF-7318 Control Board
2 Deluxe heaters may be connected to one grain
drying system and wired so they cycle together.
One of the heaters should have a thermostat
connected to it as per the installation instructions.
That heater will be referred to as the master. The
other heater (without the thermostat) will be
referred to as the slave.
Installation For
Standard Units
1. Install relay base (TD-100283) in master
heater control box.
2. Connect wire between term 6 on circuit board
and terminals 14 on relay base in master
heater.
3. Connect wire between term 13 on relay base
and terminals 8 on circuit board in master
heater.
4. Run 2 wires (18 gage) between master and
slave heaters.
5. Connect wires to terminal 5 and 9 (points A
and B) on relay base in master heater.
6. Connect wire from terminal 9 in master to
terminal 14 (point F) in slave unit.
7. Connect wire from terminal 5 in master to
terminal 15 (point E) in slae unit.
8. Install relay (TD-100282) in relay base.
Additional Steps For
Hi-Lo Units
1. Run 2 wires (18 gage) between master and slave
unit.
2. Connect wires to terminals 21 and 22 (points C
and D) on circuit board in main heater.
3. Connect wire from terminal 21 in master to
terminal 12 (point H) in slave unit.
4. Connect wire from terminal 22 in master to
terminal 13 (point G) in slave unit.
5. Install relay (TD-100282) in relay base.