26
Cast Iron Condensing Boilers – Installation Manual
FlexCore Stainless Steel Condensing Boilers – Installation Manual
ELECTRICAL WIRING
Electrical Power Connections
Label all wires prior to disconnection when
servicing controls. Wiring errors can cause
improper and dangerous operation! Verify
proper operation after servicing.
ATTENTION. Au moment de l'entretien des
com-mandes, étiquetez tous les fils avant de les
débrancher. Des erreurs de câblage peuvent
entraîner un fonctionnement inadéquat et
dangereux. S'assurer que l'appareil fonctionne
adéquatement une fois l'entretirn terminé.
The electrical connections to this boiler must be made in
accordance with all applicable local codes and the latest
revision of the National Electrical Code, ANSI /NFPA-70.
Installation should also conform with CSA C22.1 Canadian
Electrical Code Part I if installed in Canada. A separate circuit
breaker must be installed per boiler - (if required, the optional
local pump FLA must be incorporated and sized accordingly).
A properly rated shut-off switch should be located at the
boiler. The boiler must be grounded in accordance with the
authority having jurisdiction, or if none, the latest revision of
the National Electrical Code, ANSI/NFPA-70.
Line voltage field wiring of any controls or other devices must
use copper conductors with a minimum size of #14 awg.
Refer to point of connection diagram in back of this
manual and the wiring diagram supplied with the boiler
for proper wiring connections.
A minimum of (3 in WC) and maximum of
(14 in WC) must be maintained to the inlet of
the boiler gas train not to exceed a maximum
of (1 in WC) drop when firing from minimum
input to full load of the gas supply line and all
the appliances running.
Always use a wrench on the gas valve body
when making gas connections to it. Never
over-tighten the piping entering the gas
valve body or gas valve failure may result!
Safe lighting and other performance criteria were met
with the gas manifold and control assembly provided
on the boiler. All gas connections MUST be leak tested
before putting the boiler into operation.
Gas train must be isolated when purging the
gas line prior to commissioning the boiler.
The factory supplied Dungs MBC modulating
gas valve, see figure 17 incorporates an
internal filter that must be inspected and
changed at required intervals. Reference the
Dungs MBC Installation Instructions –
264541 for detailed instructions.
Never use an open flame to test for gas
leaks. Always use an approved leak
detection method. Failure to comply with
this warning can cause extensive property
damage, severe personal injury or death!
Whenever the gas supply piping is pressure tested the
boiler gas controls must be protected. If the test pressure
is equal to, or less than
1/2 psig, 3.5 kPa isolate the boiler
by closing its' manual shut off valve, see Figure 17. If the
test pressure is greater than, or equal to
1/2 psig, 3.5 kPa,
disconnect the boiler and its individual shut-off valve.
Figure 17 - Gas Supply Piping
GROUND
UNION
FROM GAS SUPPLY
SEDIMENT TRAP
AND DRIP LEG
SUPPLIED BY OTHERS
(PIPING, GAS SUPPLY, CK0850 TO 3000)
PILOT REGULATOR
AND SOLENOID VALVE
TEST PORT
MODULATING GAS VALVE
LOW FIRE GAS PRESSURE
ADJUSTMENT
HIGH FIRE
GAS PRESSURE
ADJUSTMENT
HIGH GAS PRESSURE SWITCH
(OPTIONAL ON CK1000 TO 2500 MODELS)
MANUAL SHUTOFF VALVE 2
LOW GAS PRESSURE SWITCH
CSD-1 TEST PORTS
PRESSURE
REGULATOR
PILOT SHUT OFF VALVE
MAIN GAS
VALVE
RIOM-0210_C
MANUAL
SHUTOFF
VALVE 1
