Service Information; Scheduled Inspection And Maintenance; Contact Cleaning; Location Of R4140L Relay Contacts (Front View) - Honeywell R4140G Installation Instructions Manual

i. If trouble persists, replace the detector. (Open the
master switch before replacing the flame
detector.)
IMPORTANT
If you make any changes in the flame detection
system (including the plug-in amplifier), repeat all
required tests in the Checkout section.

SERVICE INFORMATION

CAUTION
1. Only qualified service technicians should attempt
to service or repair flame safeguard controls and
burner systems.
2. Open the master switch before removing the
relay/timer cover or before cleaning the contacts.
Line voltage can be present on most contacts
when power is on. If cleaning is necessary, be
sure to replace the relay/timer cover.

Scheduled Inspection and Maintenance

A schedule should be set up and followed for periodic
inspection and maintenance, for the burner, all other controls,
and the programmer. Include the following in that schedule:
Always keep the burner and fuel mixture adjusted
according to the burner manufacturer recommendations.
Keep the flame detection system adjusted for the
smoothest, most reliable operation recommended by
the burner manufacturer.
Clean the flame detector lens, filter, viewing window,
and inside of the sight pipe, as applicable.
Check the flame signal (Table 4) using a Honeywell
W136A Test Meter or equivalent (and a 196146 Meter
Connector Plug, if needed).
If using a C7012A,C,E or F Purple Peeper Ultraviolet
Flame Detector, replace the 113236 and 115330
Electron Tubes annually (unless the detector is a solid
state model). These tubes are tested by Honeywell to
ensure reliability and safety.
with commercial substitutes.

Contact Cleaning

Field cleaning of relay or timer contacts is not recommended.
IMPORTANT
1. Do not clean contacts.
2. Use extreme care to avoid bending the contacts or
changing the specifications or configuration in any
way.
3. Do not use an abrasive or a burnishing tool to clean
contacts.
4. Do not use hard paper, such as a business card, to
clean contacts.
Do not use other types of contact cleaners. Honeywell's
chemical analysis laboratory tested other pressurized type
contact cleaners but did not approve them for these reasons:
The solvents could deteriorate plastic parts and wire
insulation.
R4140G, L AND M FLAME SAFEGUARD PROGRAMMING CONTROLS
Do not replace these tubes
The cleaners leave an oily residue that collects dust
and dirt. The residue also breaks down to form various
carbonaceous products. Either result causes early
contact failure.
Do not use an abrasive (sandpaper stick, file, etc.) or a
burnishing tool to clean contacts. Its use can cause early
contact failure for these reasons:
Some relay and timer contacts are plated with gold for
increased reliability. Burnishing can quickly remove the
plating.
The radii or points of the contacts are designed with
specific shapes to best serve the intended functions of
the contacts. Burnishing can rapidly alter these contact
configurations.
Use of an abrasive loosens fine particles of the contact
material that adhere to the surface of the contact, thus
increasing its resistance.
Contact specifications (contact pressures, press back,
and gaps) are carefully controlled during manufacturing
to ensure maximum contact life. Burnishing can easily
change these specifications.
2K1 2K2 2K3
Fig. 15. Location of R4140G and R4140M relay contact
(front view).
2K1 2K2 2K3 1K1
RERLAY CONTACTS
Fig. 16. Location of R4140L relay contacts (front view).
27
1K1 1K2 1K3
M7969
4K1
4K3 4K2
1K2 1K3 3K1 3K2 3K3
M7968
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