Roberts Gorden AG15ST, Installation, Operation & Service Manual

Page: 47 / 62

SECTION 12: O
PERATION
41
12.1.2 Heater Lockout Indicator by Volt Free
Connector
A v olt free contact relay is closed w hich enables the
ROBERTS GORDON ® controller, BMS system, etc. to
indicate the heater that has failed. An additional w ire has
to be installed from the heater v olt free connector to the
monitoring computer. See Page 39, Section 11.4 .
12.2 Testin g
Establish that a satisfactory purged gas supply and an
electrical supply is a
v ailable to the heater. Ensure that all
time clocks and thermostats are set to call for heat.
With the gas supply cut off and the electrical supply
isolated by s
w itching off at the local s w itch, open the
control chamber secured by the scre w s. Loosen the
sealing scre w from the pressure test point and remo v e
the co v er cap from the go v ernor.
Turn on the gas supply and connect appliance electrical
plug. Ensure that the timer or thermostat, if fitted, are set
to call for full gas rate. S
w itch on at the local s w itch. The
sequence as described should take place. If not, refer to
detailed fault finding sequence. When flame is
established, check the gas pressure reading and adjust if
necessary. Refer to burner data label.
Check the gas pressure at the outlet of the gas v al v e. See
Page 54, Section 16.8.1 for pressure settings or refer to
the data plate.
S w itch off the electrical supply (shutting do w n the heater),
remo v e pressure gauge, tighten pressure test point
scre w , ensuring a tight gas seal. Replace go v ernor co v er
cap. Replace control chamber door.
12.3 Commissionin g (Multiburner)
1. Establish that a satisfactory purged gas supply and
an electrical supply is a v ailable to the heater.
2. ENSURE that all the dampers are in the fully open
position.
3. With the gas supply off at each of the burners and
the electrical supply isolated, open the control
chamber secured by six scre
w s.
4. Ensure that all time clocks and thermostats are set
to call for heat.
5. S w itch on the electrical supply at the main isolator.
This w ill start the exhaust fan.
6. Balancin g Cold Suction
Check each burner v acuum by connecting an
inclined pressure gauge to the tee on the pressure
s
w itch inlet side in the burner. Adjust the damper so
that the suction is 1.9 mbar. Repeat for each burner.
7. Start at the end burner (furthest from the exhaust
fan) w ith the inclined pressure gauge connected as
described abo v e. Turn on the gas and electrical sup-
ply, reset the pressure s w itch by remo v ing suction
from the inlet side of the pressure s w itch w aiting
se v eral seconds and reconnecting. The start up
sequence described on Page 40, Section 12 should
take place. If not, refer to detailed fault finding
sequence. When flame is established, check the
gas pressure reading and adjust if necessary. See
data label.
Check the gas pressure at the outlet of the gas
v al v e. See Page 54, Section 16.8.1 for pressure set-
tings or refer to the data plate.
S
w itch off the electrical supply (shutting do w n the
heater), remo v e pressure gauge, refit pressure test-
point scre w , ensuring a tight gas seal. Replace go v -
ernor co v er cap.
Repeat this procedure for each burner in the sys-
tem.
Close the control chamber and secure
w ith six
scre w s.
8. Balancin g Hot Suction
Reconnect all the burners on the system and allo w
them to reach full operating temperature (approxi-
mately 20 minutes). Return to each burner and
recheck the hot suctions at the tee on the inlet to the
pressure s
w itch. Re-adjust the damper so that the
hot suction of 1.7 mbar is achie v ed and lock the
damper in position.
12.4 System Checks
S w itch on again at the local s w itch to help ensure smooth
ignition. Carry out the follo w ing system checks:
When running, turn off the gas supply at the appliance.
The heater
w ill immediately shut do w n follo w ed by one
attempt at restoration follo w ed by lockout.
Linear and Double Linear only:
When running, disconnect the fan plug from the burner.
The unit should shut do
w n w ithin three seconds, pro v ing
operation of the pressure s w itch.
12.5 User Instructions
After satisfactory testing, ensure that the client is fully
a
w are of the operation of the system. Bring this manual to
the attention of the user or purchaser; instruct them in the
safe operation of the heater(s).
Description Part Number
Connector male - Volt Free 91324000
Connector female - Volt Free 91324001
Wire Blue 7" 91300004
Wire Bro w n 7" 91300005
Wire Yello w 12" 91300003
Scre w #8 x 3/8 Hex Wshr PHH Type 23 94961406
Base relay P2RF05E C1050B
Relay G2R1-SN IMO 220 V 10 A C1049B