INTERNAL WORKINGS & IDENTIFICATION
FOUR CHAMBER (RA-18, 22, 28)

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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

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