R4795A
CHECKOUT
Checkout
CAUTION
Use extreme care while testing the R4795; line voltage can be present on most terminals when the power is On.
CHECKOUT SUMMARY
The following list summarizes the checkout tests re- quired for each type of installation. Instructions for each test are included in this section.
Preliminary Inspection: All installations.
Flame Current Check: All installations.
Fig. 10—Internal view showing amplifier and test jack for flame current test.
PROTECTION (R7289 RECTIFICATION
AMPLIFIER ONLY)
ST71A | TEST JACK | |
| ||
PURGE |
| |
TIMER |
| |
| ||
| AMPLIFIER |
Pilot Turndown Test: If a pilot must be proved before the main fuel valves can open.
Hot Refractory
PURGE TIMER CONNECTORS
AMPLIFIER CONNECTORS
Ignition Spark Response Test: All ultraviolet detector applications.
Safe Shutdown Tests: All installations.
Refer to Fig. 2 to 3 for terminal location, and to Fig. 9 and
10 for location of component parts. Loosen thumbscrew to remove cover.
Fig. 9—Internal components of R4795A.
3K | 2K |
| CAPTIVE |
1K | MOUNTING |
UNDER | SCREWS |
COVER | (10) |
OPTIONAL
ALARM TERMINALS
M8680
PRELIMINARY INSPECTION
Make certain that:
1. | Wiring connections are correct and all terminal screws |
are tight. Use a meter to check the continuity of all circuits. | |
2. | Flame detector is installed and positioned properly. |
Consult the appropriate installation instructions. | |
3. | Ambient temperature at flame detector does not ex- |
ceed maximum rated temperature. | |
4. | Correct combination of amplifier and flame detector is |
used. Refer to | |
tions section. | |
SAFETY SWITCH RESET BUTTON
5. | Burner is completely installed and ready to fire; fuel |
lines are purged of air. | |
6. | Combustion chamber and flues are clear of fuel. |
7. | Power is connected to system disconnect switch (mas- |
ter switch). | |
8. | Safety switch is reset; push in and then release the |
green safety switch. | |
9. | All limits and interlocks are reset. |
SPRING
CLIP FOR
AMPLIFER
TRANSFORMER
PLUG IN AMPLIFIER
IMPORTANT: Anytime you reset the safety switch, wait at least one minute after it trips to allow the heater to cool before pushing in the reset button.
CAUTION
Make initial pilot lightoff with manual main fuel shutoff cock closed.
8 |
