Checkout - Honeywell 7800 Series Manual

RM7888A
STATIC CHECKOUT • CHECKOUT
Test Test
No. Jumpers
10 15-13
11 4-21
* Apply 120 Vac power to the special function inputs from the external controller/device one at a time (in
sequence) and perform tests 12 through 15.
12 —
13 —
14 —
15 —
Final CAUTION
On completing these tests, open the master switch and remove all test jumpers from the subbase terminals.
Also remove bypass jumpers from the low fuel pressure limits (if used).
WARNING
Do not allow fuel to accumulate in the combus-
tion chamber. If fuel is allowed to enter the cham-
ber for longer than a few seconds without igniting,
an explosive mixture could result. It is recom-
mended that the trial for pilot be limited to ten
seconds, and the attempt to light the main burner
be limited to two seconds from the time the fuel
has reached the burner nozzle. In any case, do not
exceed the nominal lightoff time specified by the
equipment manufacturer. Close the manual fuel
shutoff valve(s) if the flame is not burning at the
end of the specified time.
65-0175
TABLE 10—STATIC CHECKOUT (Continued).
Voltmeter
— 1. If modulation is used, raise
setpoint of series 90 controller—
firing rate motor should drive
toward open.
2. Lower set point of series 90
controller—firing rate motor
should drive toward closed.
— Verify Flame Proven indication
received by external device.
1. 6-L2 1. Line voltage at terminal 6.
2. 17, 19, 20-L2 2. Verify no voltage is present.
1. 17-L2 1. Line voltage at terminal 17.
2. 6, 19, 20-L2 2. Verify no voltage is present.
1. 19-L2 1. Line voltage at terminal 19.
2. 6, 17, 20-L2 2. Verify no voltage is present.
1. 20-L2 1. Line voltage at terminal 20.
2. 6, 17, 19-L2 2. Verify no voltage is present.
Normal If Operation Is Abnormal, Check The
Operation Items Listed Below
1. Series 90 Controller.
2. Firing rate motor and transformer.
1. Flame Proven circuit.
1. Special Function 1 circuit.
1. Special Function 2 circuit.
1. Special Function 3 circuit.
1. Special Function 4 circuit.
CAUTION
1. Use extreme care while testing the system.
Line voltage is present on most terminal con-
nections when power is on.
2. Open the master switch before removing or
installing the RM7888A.
3. Make sure all manual fuel shutoff valve(s) are
closed before starting the initial lightoff check
and the Pilot Turndown tests.
4. Do not put the system in service until you have
satisfactorily completed all applicable tests in
this section and any others required by the
equipment manufacturer.
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