Honeywell RA890F Protectorelay Primary Control Quick Manual Download Page 8

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60-2034—7

RA890F

C H E C K O U T

Checkout

IF A STEADY READING OF AT LEAST MINIMUM

STRENGTH CANNOT BE OBTAINED, ONE OR MORE
OF THE FOLLOWING CONDITIONS CAN EXIST:

• Improper supply voltage.
• Defective flame detector wiring including:

— Open circuits.
—Short circuits.
— High resistance shorts caused by moisture, accu-

mulated dirt, or improper choice of detector leadwire
for the particular installation.

• Improper sighting, improper viewing window, or dirty

viewing window for optical detectors.

• Improper application of a flame rod including:

— Insufficient ground area.
— Poor location of flame rod in flame.
— Excessive heat on flame rod insulator (greater than

600

F (316

C).

— Ignition interference.

• Improper application of a vacuum photocell, including:

— Temperature over 165

F (74

C) at photocell.

— Dirty photocell envelope.

• Defective sensor.

Fig. 8—Connecting meter to read flame
current.

CAUTION

Use extreme care while testing the RA890F; line
voltage can be present on most terminals when
power is on.

PRELIMINARY CHECKS

Before placing the system in operation, complete the

following preliminary checks:

1. Check through wiring. Use a meter to check the conti-

nuity of all circuits. See Fig. 8.

2. Check flame detector installation.
3. Check burner adjustments.
4. Thoroughly purge gas piping.
5. Reset the safety switch by pushing in and then releas-

ing the green safety switch button.

6. If the system has a standing pilot, make sure the pilot

link (Fig. 7) is removed and the pilot is lit.

CHECKOUT REQUIRED

Before the installation is complete, satisfactorily perform

all checkout tests indicated below.

Flame Current Check (all installations).
Pilot Turndown Test (all installations that require proof of

pilot before main fuel valve is opened).

Safe Shutdown Checks—Flame failure, power failure,

limit action (all installations).

Hot Refractory Hold-In (photocell applications only).

FLAME CURRENT CHECK

The flame current check is the best indicator of proper

flame detector application. Perform the check at the time of
installation, at any time service is done on the system, and at
least once a month or more often while the system is in
operation. This prevents shutdowns due to poor flame signal.

Perform test by connecting a W136 (or equivalent)

microammeter in series with the flame detector and reading
the flame signal while the burner is operating.

Insert a 196146 Meter Connector Plug, wired color-to-

color to the W136A leadwires, into the test jack on the
RA890F. This automatically puts the microammeter in se-
ries with the flame detector.

If a meter connector plug is not available, disconnect the

flame detector lead from the F terminal; then connect this
lead to the Black lead of the microammeter, and connect the
Red lead of the microammeter to the F terminal.

When reading the flame current, assure the following

criteria are met:

1. The flame current is steady; meter does not vary more

than a needle width.

2. The flame current is at least two microamperes for a

rectification type detector like used with the RA890F. The
normal operating range is 2 to 5 microamperes.

M8755

BLACK

RED

FLAME
CURRENT
TEST JACK

RA890

IF 196146 METER CONNECTOR PLUG IS NOT AVALIABLE —