Internal Workings & Identification
Four Chamber (RA-18, 22 & 28)
LEGEND
1:Heating Element #1 2: Heating Element #2 3:Heating Element #3
4:Heating Element #4 5:Inlet Water Tube 6:Level Detect Screw
7:Level Detect Screw 8:Outlet Water Tube 9: Printed Circuit Board
10:Transformer 11:Heating Element Relays (8) 12:Audible Speaker
13:Output Temperature Control 14:Microprocessor Control Chip
15:Blue Button; Activates Audible 16:Terminal Spades for Leak Detect Wires
17:Triacs (4) 18:Triac Mounting Blocks to Heat Sink (4)
19:Copper Heat Sink Tube
L1:Power Connection Lugs (208 240 VAC)
L2:Power Connection Lugs (208 240 VAC)
H. Limit : High Temperature Limit Switches (2)
TH-IN : Inlet Temperature Sensor
TH-1 : Chamber Temperature Sensor #1
TH-2 : Chamber Temperature Sensor #2
TH-3 : Chamber Temperature Sensor #3
TH-4 : Chamber Temperature Sensor #4
