Valve Proving System - Honeywell RM7800L1087 Installation Instructions Manual

PURGE
TIMER
RESET
BUTTON
SCR OLL
MO DE
- SAV E -
2-LINE VFD
KEYBOARD
DISPLAY
MODULE
(STANDARD ON
RM7800E,G,L,M)

VALVE PROVING SYSTEM

The Valve Proving System feature provides a systematic
way of testing the valve seat integrity to assure the valves
are in the closed state whenever the sequence of
operation requires them to be closed. It is designed to
detect a leak greater than 0.1% of the burner input
capacity. For example, a 10 million Btu/hr natural gas-
fueled burner would have a fuel input capacity of
3
approximately 1,000 ft /hr. A leak rate greater than 0.1%
3 3
of 1,000 ft /hr or 1 ft /hr in either valve will be detected
with the Valve Proving System. Smaller leaks will not be
detected.
At commissioning time, the Valve Proving System may be
scheduled to occur at one of five different times: Never,
Before, After, Both, and Split.
Never—Device default as received: in this case Valve
Proving does not occur.
WIRING
SUBBASE
RUN/TEST
SWITCH
CONFIGURATION
JUMPERS
4-LINE LCD
KEYBOARD DISPLAY MODULE
(SOLD AS AN OPTIONAL
ACCESSORY, SEE PG. 21)
Fig. 8. RM7800L/40L, EC7840L Relay Module exploded view.
RELAY MODULES WITH VALVE PROVING
Before—Valve Proving occurs concurrently with Pre-
Purge.
After—Valve Proving occurs after the Run state before
the internal Safety Relay dropout state and concurrent
with Post Purge (if configured).
Both—Valve proving occurs at both times Before and
After noted above.
Split—The downstream seat (high pressure) test is per-
formed at the Before time and the upstream seat (low
pressure) test is performed during the After time.
The Valve Proving items programmed are:
1. Specify when to perform Valve Proving. Demand
input to terminal 17 actually enables the function of
Valve Proving.
2. Specify the time duration of the test (calculated from
Appendix A).
13
DIN RAIL MOUNT BASE:
SHOWN Q7800XX
BASE SECURITY PIN
CAPTIVE
MOUNTING
SCREW
FLAME
AMPLIFIER
32-00142—01