
Startup
32
OAU-SVX005C-EN
iii. Record Gas Pressures
–PG1
–PG2
iv. At ROD, read and record
–Outdoor Air Temperature
–Discharge Air Temperature
–Burner
P
v. Release Heating Control Signal Override
b. Low Fire Test Following Normal Burner Starting
Sequence
i. Override Heating Control Signal to 0 percent
ii. Confirm PG1 and PG2 pressures are within
±5 percent of the pressures shown on Burner
Data Plate
iii. Allow a minimum of 5 minutes of operation at
0 percent heating signal
iv. At ROD read and record
–Outdoor Air Temperature
–Discharge Air Temperature
–Burner
P
v. Record Gas Pressures
–PG1
–PG2
c. Ignition Cycle Test
i. Release Heating Control Signal Override
ii. Complete at least (5) calls for heat
–At each call for heat default heating start-up,
signal is 25 percent
–Following each ignition test and before
attempting the next test monitor analogue
Heating Control Signal at ROD to be sure
heat signal is released at end of each
90-second warm-up period
5. Burner Gas Train, Ignition Controls and Starting
Sequence for Gas Input Rating > 400 MBh
a. Pilot Gas Train
i. Manual Shut-Off Valve (PSO)
ii. Pilot Gas Regulator (PGR)
iii. Pilot On-Off Valve (PGV)
b. Burner Gas Train
i. Manual Shut-off Valves (2) (MSO1 and MSO2)
ii. Main Gas Regulator (1) (GR)
iii. Main Gas Valves—Automatic Safety On-Off
Control (2) (GV1 and GV2)
iv. Modulating Gas Valve (MGV)
v. Gas Pressure Gauges
–Gas Supply Pressure (PG1)
–Burner Inlet Pressure (PG2)
c. Burner Control Operation
The RM7895, EC7895, and RM7896 have the
operating sequence as shown in
and
. The LED provides positive
visual indication of the program sequence for
power, pilot, flame, main, and alarm.
Initiate
The relay module enters the initiate sequence when it is
powered. The RM7895A/B/C/D, EC7895A/C and RM7896A/
B/C/D can also enter the initiate sequence if the relay
module verifies voltage fluctuations of +10/-15 percent or
AVERTISSEMENT
Risque d’explosion!
Des composants au gaz défectueux peuvent exploser
ou entraîner des fuites de gaz inflammable pouvant
provoquer un incendie résultant en des blessures
graves, voire mortelles, ou des dommages matériels.
Pour éviter d’endommager l’unité si PG1 ou PG2
dépasse les pressions nominales indiquées sur la
plaque signalétique de plus de 5 %, désactivez l’arrivée
en gaz au moyen des vannes d’arrêt manuel et assurez-
vous que la pression entrante est conforme aux valeurs
indiquées sur la plaque signalétique AVANT d’activer
l’arrivée en gaz.
Figure 14.
> 400 MBh Gas train
KCC
International Inc.
PGR
MSO1
GR
PGV
PG2
MGV
GV2
GV1
PG1
MSO2
PSO