Grain Systems PNEG-581 - Manual (Page 18)

18 PNEG-581 Deluxe Vane Axial Heater
3. Heater Installation
Second Heater Installation
For Units Using HF-7318 Control Board
Two (2) deluxe heaters may be connected to one (1) grain drying system and wired so they cycle
together. One (1) 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 terminal 6 on circuit board and terminal 14 on relay base in master heater.
3. Connect wire between terminal 13 on relay base and terminal 8 on circuit board in master heater.
4. Run two (2) wires (18 gauge) 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 slave unit.
8. Install relay (TD-100282) in relay base.
Additional Steps For High-Low Units
1. Run two (2) wires (18 gauge) between master and slave unit.
2. Connect wires to terminal 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.
Figure 3F The HF-7318 Control Board