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Low Water Cutoff
Automatically shuts down burner whenever water
level drops below probe. A 3 to 5 second time delay
prevents premature lockout due to temporary condi-
t
ions such as power failure or air pockets. Standard on
Cal Code heaters.
High & Low Gas Pressure Switches
Pressure switches sense either high or low gas pres-
sure and automatically shut down burners if abnormal
pressures exist. Standard on Models 3001-4001.
Electrical Wiring
Electronic Ignition
The intermittent ignition device conserves energy by
automatically extinguishing the pilot when desired
temperature is reached. When additional heat is need-
ed, the pilot re-ignites electrically, eliminating the fuel
costs of maintaining a constant pilot. To ensure safe
operation, the gas valve cannot open until the pilot
relights and is confirmed.
Heater must be electrically grounded and bonded in
accordance with local codes, or, in the absence of
local codes, with the latest edition of the National
Electrical Code, ANSI/NFPA 70.
Fig. 25: Low Water Cutoff
Fig. 26: High/Low Gas Pressure Switch
Model
Without Lockout With Lockout
N P N P
926–1826 Standard N/A Optional Standard
2100–4001 N/A N/A Standard Standard
CAUTION: Label all wires prior to disconnection
when servicing controls. Wiring errors can cause
improper and dangerous operation. Verify proper
operation after servicing.
D
ANGER - SHOCK HAZARD - Make sure
electrical power to the heater is disconnected to
avoid potential serious injury or damage to
components.
NOTE: If it is necessary to replace any of the
original wiring, it must be replaced with 105° C wire
or its equivalent.
Table E: Lockout Availability
Fig. 27: Ignition Module