Bock Water heaters OT300-A Installation And Operation Instruction Manual page 50

SECTION VIII: PARTS LIST (cont.)
Table 18: optiTHERM Wiring Harnesses
Table 18: optiTHERM Wiring Harnesses
Part #
21650 Blower Power Supply & PWM
21652 Transformer & Flame Rod
21655 Tank Temperature Sensors & Display
21657 Hot Surface Ignitor
21660 Main Power Supply
21664 Safety Switches
21680
21677 J!Box to Terminal Block
21665 Plug!in Power Cord
21667 Power Switch
21669 Gas Pressure Switch
21673 Blower Relay (2 req'd)
21675 Power to Anode Controller
21671 Flue Gas Temperature Sensor & Safety Switch
15155
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Description
Gas Control
Anode Rods
From
Main Control (J9) & Fuse Block
Main Control (J13)
Main Control (J5)
Main Control (J4)
Main Control (J2)
Main Control (J16)
Gas Control
Junction Box
Junction Box
Power Switch
Gas Pressure Switch
Relay
Relay
Terminal Block
Harness #21655 & Harness #21664
Anode Power Supply
Connections
To
Blower (2 connections)
24V Transformer & Flame Rod
Tank Temp. Sensors, Display & Harness #21671
Hot Surface Ignitor
Terminal Block & Power Switch
Air Proving Switch, Blocked Intake Switch, Harness
#21671 & Harness #21669
24V Transformer & Ground
Terminal Block
Standard 3!Prong 120VAC Plug
Terminal Block
Harness #21664 & Ground
Terminal Block
Fuse Block
Anode Power Supply
Flue Gas Sensor & Blocked Exhaust Switch
Anode Rods