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 RM7840.
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.
Test RM7840 Test Volt- If Operation Is Abnormal,
No. Models Jumpers Meter Normal Operation Check The Items Listed Below
WARNING
Make sure all manual fuel shutoff valves are closed.
13 RM7840 4-5 19-L2 Firing rate motor drives closed; zero 1. Low Fire Start Switch.
E,L and volts at terminal 19 after motor 2. Firing rate motor and transformer.
models 14-13 starts driving closed.
14 RM7840 15-13 — 1. Raise set point of series 90 1. Series 90 Controller.
E,G & L controller—firing rate motor 2. Firing rate motor and transformer.
models should drive toward open.
2. Lower set point of series 90
controller—firing rate motor
should drive toward closed.
15 RM7840M 4-13 — If damper motor is used, motor 1. Damper motor.
models drives damper open.
with Open
Damper
Contacts
16 RM7840M 4-5 18-L2 If damper motor is used, spring return 1. Low Fire Start Switch.
models drives motor and damper closed; 2. Damper motor.
with Open line voltage at terminal 18 after
Damper motor is in Low Fire position.
Contacts
17 RM7840M 4-5 18-L2 If damper motor is used, motor 1. Low Fire Start Switch.
models and drives open; zero volts at terminal 2. Damper motor.
with 4-13 18 after motor starts driving open.
Open
Damper
Contacts
Final All 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).
TABLE 4—STATIC CHECKOUT (Continued)
RM7840E,G,L,M
STATIC CHECKOUT • CHECKOUT
Checkout
24
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WARNING
Do not allow fuel to accumulate in the combus-
tion chamber. If fuel is allowed to enter the
chamber for longer than a few seconds without
igniting, an explosive mixture could result. It is
recommended that you limit the trial for pilot to
ten seconds, and limit the attempt to light the
main burner 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.
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