Vent Damper
Normal Operation Summary
For safe, efficient operation, the vent damper and all
flue product carrying areas of the appliance must be
checked annually, with particular attention given to
deterioration from corrosion or other sources. Check
vent damper operation as follows:
1. When the boiler is off, check that the vent damper
position indicator points to the closed position. (See
figure below.)
2. Turn the thermostat or controller up to call for heat
and check that the vent damper indicator points to the
open position. (See figure below.)
3. Turn the thermostat or controller down again and
check that the vent damper position indicator returns
to the closed position.
NOTE:
The vent damper must be inspected at least
once a year by a trained, experienced service
technician. Damper must be in open position when
boiler main burners are operating.
DAMPER POSITION INDICATOR
DAMPER
OPEN
DAMPER
CLOSED
Fig. 18: Vent Damper Position Indicator
Fig. 19: Connection Diagram for Effikal® Vent Damper
Plumbing
Gas Supply Connections
Gas piping must have a sediment trap ahead of the
boiler gas controls, and a manual shut-off valve locat-
ed outside the heater jacket. All gas piping should be
tested after installation in accordance with local codes.
A minimum of 7.0" W.C. upstream gas pressure under
full load and a maximum gas supply pressure setpoint
of 10.5” W.C. under load and no-load conditions for
natural gas. A minimum of 12.0” W.C. upstream gas
pressure under full load and a maximum gas supply
pressure of 13.0” W.C. is required for propane gas. If
upstream pressure exceeds 1/2 psi at any time, an
intermediate gas pressure regulator, of the lockup
type, must be installed.
NOTE:
Do not use teflon tape on gas line pipe
thread. A flexible sealant approved for the fuel being
used is recommended.
Fig. 20: Plumbing
CAUTION:
The boiler and its manual shut-off valve
must be disconnected from the gas supply during
any pressure testing of that system at test pressures
in excess of 1/2 PSIG. Dissipate test pressure in
the gas supply line before reconnecting the boiler
and its manual shut-off valve to gas supply line.
FAILURE TO FOLLOW THIS PROCEDURE MAY
DAMAGE THE GAS VALVE. OVER PRESSURED
GAS VALVES ARE NOT COVERED BY
WARRANTY. The boiler and its gas connections
shall be leak tested before placing the appliance in
operation. Use soapy water for leak test do NOT use
open flame.
15
