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20 NH-4 Heaters
Heat Limiter Replacement
Heater Cartridge Replacement
Fluid Heating Reservoir Replacement
1602369-05
WARNING:
Remove power, relieve fluid and air pressure, and allow heater to cool down
before performing any maintenance. Failure to observe this warning may cause serious
injury to personnel and/or damage to equipment.
1. Remove the thermostat. Refer to Thermostat Removal procedure.
2. Disconnect the lead wire L1 from the heat limiter.
3. See Figure 8. Carefully pull the heat limiter out of the HL bore (2) in the fluid passage
body.
4. Install the heat limiter into the HL bore (2) in the fluid passage body.
5. Connect the lead wire L1 to the heat limiter.
6. Install the thermostat. Refer to Thermostat Installation procedure.
1. Remove the thermostat. Refer to Thermostat Removal on page 17.
2. Disconnect the wire lead L2 from the cartridge.
3. Remove the heater cartridge. Standard Heaters:
a. Remove the socket head screw and lock washer located in the bottom of the fluid
passage body.
b. Place a 6.4 mm (1/4 in.) diameter rod, approximately 254 mm (10 in.) in length, into
the socket head screw hole against the drive-out plug.
c. Carefully drive the heater cartridge out of the fluid passage body.
Stainless Steel Heaters: Remove the heater cartridge from the top of the fluid passage
body.
4. Install the heater cartridge into the fluid passage body.
Standard heaters: Make sure the drive-out plug is installed in the fluid passage body
before installing the heater cartridge. Install the socket head screw and lock washer into
the bottom of the fluid passage body and tighten securely.
5. Connect wire lead L2 to the heater cartridge.
6. Install the thermostat. Refer to Thermostat Installation procedure.
WARNING:
Remove power, relieve fluid and air pressure, and allow the heater to cool
down before performing any repairs. Failure to observe this warning may cause serious
injury to personnel and/or damage to equipment.
© 2023 Nordson Corporation
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