Primary Heaters - Graco Reactor H-25 Series Repair And Parts Manual

Repair

Primary Heaters

Heater Element
1. Turn main power OFF
supply.
2. Relieve the pressure. See Pressure Relief
Procedure, page 26.
3. Wait for heaters to cool.
4. Remove heater shroud.
5. See pages 59-61 for illustrations of each heater.
Disconnect heater element wires from heater wire
connector. Test with ohmmeter.
Total Heater
Wattage Element
6,000 1500
7,650 2550
8,000 2000
10,200 2550
6. To remove heater element, first remove
thermocouple (310) to avoid damage, see step 7,
page 36.
7. Remove heater element (307) from housing (301).
Be careful not to spill any fluid left in housing.
8. Inspect element. It should be relatively smooth and
shiny. If there is a crusted, burnt, ash-like material
adhered to element or sheath shows pitting marks,
replace element.
9. Install new heater element (307), holding mixer
(309) so it does not block thermocouple port (P).
10. Reinstall thermocouple, step 8, page 36.
11. Reconnect heater element leadwires to heater wire
connector.
12. Replace heater shroud.
36
. Disconnect power
Ohms
30-35
18-21
23-26
18-21
Line Voltage
The primary heaters output their rated wattage at 230
Vac. Low line voltage will reduce power available and
the heaters will not perform at full capability.
Thermocouple
1. Turn main power OFF
supply.
2. Relieve the pressure. See Pressure Relief
Procedure, page 26.
3. Wait for heaters to cool.
4. Remove heater shroud.
5. Disconnect thermocouple wires from B on
temperature control module. See T
and F . 8, page 34.
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6. Feed thermocouple wires out of cabinet. Note path
as wires must be replaced in the same way.
7. See F . 9. Loosen ferrule nut (N). Remove
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thermocouple (310) from heater housing (301), then
remove thermocouple housing (H). Do not remove
the thermocouple adapter (305) unless necessary. If
adapter must be removed, ensure that mixer (309)
is out of the way when replacing the adapter.
8. Replace thermocouple, F
a. Remove protective tape from thermocouple tip
(T).
b. Apply PTFE tape and thread sealant to male
threads and tighten thermocouple housing (H)
into adapter (305).
c. Push in thermocouple (310) so tip (T) contacts
heater element (307).
d. Holding thermocouple (T) against heater
element, tighten ferrule nut (N) 1/4 turn past
tight.
. Disconnect power
6, page 34
ABLE
. 9.
IG
312063Z