Grain Systems PNEG-588-04 - Manual (Page 16)

5. Installation
16 PNEG-588-04 Deluxe Downwind Heater Installation and Operation
Deluxe Heater - Second Heater Installation
For Deluxe Units Using HF-7318-1 Control Board
Two (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 ON/OFF 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 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.
Figure 5F The Control Board (HF-7318-1)