Maintenance
5-2
750-204
Profire D/LND
at all times. Keep the control cabinet doors closed. Dust and dirt can damage motor starters and relay contacts.
Starter contacts are plated with silver and are not harmed by discoloration. Never use files or abrasive materials
such as sandpaper on contact points.
5.2.1 — Programming Control
This control requires no adjustment, nor should any attempt be made to alter contact settings or timing logic.
Those programmers with contacts may require occasional cleaning. If so, follow instructions given in the manu-
facturer’s bulletin. Never use abrasive materials, The manufacturer’s bulletin also contains troubleshooting infor-
mation. The flame detector lens should be cleaned as often as conditions demand. A periodic safety check
procedure should be established to test the complete safeguard system. Tests should verify safety shutdown with
a safety lockout upon failure to ignite the pilot or the main flame, and upon loss of flame. Each of these condi-
tions should be checked on a scheduled basis. The safety check procedures are contained in the manufacturer’s
bulletin.
5.3 — Impeller and Stator Cone
Proper clearance between the impeller and the inlet
housing and between the impeller and stator cone is not
critical and is set at 1/8” nominal. When installing or
removing the impeller, it is mandatory to use an impact
wrench.
Inserting a bar through the impeller blade and using it as
a lever will only damage the blade and also void the 5
year impeller warranty. If the impeller is changed to a dif-
ferent width, the stator cone position may require adjust-
ment. This is provided for by means of slotted mounting
holes in the blast tube. Loosen the three screws to repo-
sition the cone.
FIGURE 5-1. Impeller and Stator Cone
5.4 — Firing Head Inspection
1. Disconnect the damper linkage.
2. Release the impeller housing latch and swing the housing open for access to the firing head.
3. Inspect the flame scanner lens to be sure it is clean and the support tube is in proper position to sight the
flame through the hole in the diffuser.
4. Inspect the lead wire to the ignition electrode. It must be firmly attached and the insulation should be clean
and free of cracks.
NOTE: Under no circumstance should anything other
than an impact wrench be used.
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