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Low Water Cut-Off (Optional)
The probe-type low water cut-off automatically shuts
down burner whenever water level drops below the
probe for more than 2 seconds. A 30-second time
delay prevents premature lockout due to temporary
conditions such as power failure or air pockets.
Fig. 35: Low Water Cut-Off
High and Low Gas Pressure
Switches (Optional)
NOTE: The High Gas Pressure Switch is standard
on Models 3001-4001
These switches sense either high or low gas pres-
sures and automatically shut down burners if abnormal
pressures exist.
Fig. 36: Gas Pressure Switch
ELECTRICAL
CONNECTIONS
CAUTION: Label all wires prior to disconnection
when servicing controls. Wiring errors can cause
improper and dangerous operation. Verify proper
operation after servicing.
DANGER - SHOCK HAZARD: Make sure
electrical power to the heater is disconnected to
avoid potential serious injury or damage to
components.
This boiler is normally wired for 120 Volts. The voltage
is indicated on the tie-in leads. Consult the wiring dia-
gram shipped with the boiler in the instruction packet.
The "TH" leads are for the remote tank control connec-
tion. 24 Volts are supplied to this connection through
the boiler transformer.
DO NOT attach line voltage to the "TH" leads on mod-
els 133-1826. Before starting boiler check to ensure
proper voltage to boiler and pump.
The boiler must be electrically grounded in accordance
with National Electrical Code ANSI/NFPA No 70, or
with CSA C22.1 C.E.C. Part 1 in Canada.
NOTES:
1. Field install ground to inside of junction box.
2. If any of the original wire as supplied with the boil-
er must be replaced, it must be replaced with
105°C wire or its equivalent.
24
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