High Pressure Housing Removal − Standard Heaters Only; Fluid Heating Reservoir Installation - Nordson NH-4 Customer Product Manual

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22 NH-4 Heaters

1602369-05

High Pressure Housing Removal − Standard Heaters Only

See Figure 9.

1. Remove the retaining ring (6) from the fluid passage body (2).

2. Place a wooden block on a hard surface. Grasping the reservoir assembly firmly,

strike the top surface of the fluid passage body against the wood block until the lower

O-ring (5) is exposed.

3. Remove the lower O-ring (5), turn the reservoir assembly right side up and strike

against the wood block until the upper O-ring (1) is exposed. Remove the upper

O-ring.

4. Use the wood block as a driver to force the fluid passage body (2) out of the high-

pressure housing (9).

5. Soak the fluid passage body in a suitable solvent until hardened coating material has

softened. Use a blunt instrument such as a thin piece of wood, or similar object, to

clean spiral grooves.

6. Install new O-rings onto the fluid passage body.

7. Install the fluid passage body into the high-pressure housing and secure with the

retaining ring.

1. Install the fluid heating reservoir to the electrical enclosure. Use PTFE paste on the

threads to prevent galling. Tighten securely.

2. See Figure 8. Align the holes for the set screws (1). Back the fluid heating reservoir

out by no more than one turn to align the holes. Install the set screws and tighten

securely.

NOTE:

Refer to the Parts section for part numbers for the appropriate reservoir seal kit.

This kit contains replacement O-rings for the fluid fittings, along with heat-conductive

paste for thermostat installation.

3. See Figure 9. Install new O-rings on the fluid inlet (8) and outlet fittings (4).

4. Install the fluid outlet and inlet fittings into the fluid passage body. Tighten the fittings

to 1.66−2.08 kg•m (12−15 ft-lb).

5. Insert the applicator (supplied with the seal kit) into the fluid passage body bore

stamped T and dispense all heat-conductive paste into the bore.

6. Install the heater cartridge. Refer to Heater Cartridge Replacement procedure.

7. Install the heater limiter. Refer to Heat Limiter Replacement procedure.

8. Install the thermostat. Refer to Thermostat Installation procedure.

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