Checkout - Honeywell 7800 Series Manual

7800 SERIES RM7830A, RM7850A RELAY MODULE

CHECKOUT

Equipment Recommended
Volt-ohmmeter (1M ohm/volt minimum sensitivity) with:
• 0-300 Vac capability.
• 0-6000 ohm capability.
• 0-10 Vdc capability.
Flame Signal Measurement
(Table 7 and Fig. 22)
Measure the flame signal at the appropriate times as defined
in the following Checkout tests. Read the flame signal in volts
dc at the flame amplifier test jacks + and (Com) or at the
Keyboard Display Module.
Flame Detector
Flame Rod
Photocell
C7015
C7027A
C7035A
C7044A
C7061A
C7012E,F
C7076A,D
a
This minimum or stronger signal should easily be obtained if the detector is correctly installed and positioned to properly sense
the flame. This voltage must be obtained before completing checkout.
b
The flame amplifiers are AMPLI-CHECK™ type.
c
The flame signal amplifier circuitry is tested one-half second every five seconds during burner operation and shuts down the
burner if the amplifier fails (all installations).
d
The flame amplifiers are self-check type.
65-0222
Table 7. Flame Signal.
Flame Signal Amplifier
b,c
R7847A,B
b,c
R7848A,B
b,c
R7849A,B
c,d
R7861A
c,d
R7847C
c,d
R7886
NEGATIVE (-)
METER LEAD
Fig. 22. Flame signal measurement.
Use 1M ohm/volt meter with a 0 to 10 Vdc capability.
Set the 1M ohm/volt meter to the 0 to 10 Vdc range.
Insert the positive (red) probe into the + jack of the
flame amplifier. Insert the negative (black) probe into
the (Com) jack of the flame amplifier, see Fig. 22.
Allow a few seconds for the meter reading to stabilize.
If using AMPLI-CHECK™ or shutter check amplifiers,
read the average stable voltage, disregarding the peaks
and valleys caused by the self-checking operation.
The meter reading must be as specified in Table 7, after
all tests are completed and all adjustments made.
As an option, the flame signal can be checked by using the
Keyboard Display Module.
If the signal is unstable or less than the minimum acceptable
voltage, check flame detector installation and circuitry.
Minimum
a
Steady dc Voltage
1.25 Vdc
POSITIVE (+)
METER LEAD
ONE
MEGOHM/VOLT
METER
M7383
28
Maximum
Expected dc Voltage
5.0 Vdc at Keyboard
Display Module
OR
5.0 Vdc at 1M ohm/volt meter