16
EQUIPMENT AND OPTIONAL ACCESSORIES - WHAT THEY DO
ROLLOUT SWITCH
(FLAME ROLLOUT SAFETY SHUTOFF)
The rollout switch is a temperature-sensitive fuse link
device. It is located on the boiler base just outside
the fi re box. In the event of heat exchanger fl ueway
blockage causing fl ame to roll out of the fi re box, the
fuse does not change in appearance when blown.
If the rollout switch blows, it must be replaced
with an exact replacement. Check heat exchanger
fl ueways for blockage when restoring system to
operating condition. DO NOT operate system without
a rollout switch.
SPILL SWITCH
(BLOCKED VENT SAFETY SHUTOFF)
The spill switch is a manual reset disc thermostat with
a fi xed setpoint (340° F), and normally closed contacts.
It is located at the relief opening of the integral draft
diverter. In the event of chimney or venting system
blockage causing products of combustion to spill out of
the relief opening, the spill switch disc heats up and the
spill switch contacts open, shutting down the fl ow of gas
to the main burners by removing power to the gas valve.
In the event that the spill switch contacts open, the
reset button on the back of the switch will pop up. The
spill switch must be reset manually, after the switch
has cooled off, by pushing the reset button down.
Check the venting system and chimney for blockage
when restoring the system to operating condition. DO
NOT operate the boiler without a spill switch.
STARTING YOUR BOILER
HOW A HOT-WATER SYSTEM OPERATES
Your entire heating system (boiler, piping and radiation
units) is fi lled with water. As the water in the boiler is
heated, it is pumped from the top of the boiler through
the supply main to the radiation units. The cooler water
in them fl ows back through the return main to the
boiler. This provides positive and rapid response to the
thermostat.
FILLING SYSTEM WITH WATER
Close the air vents on all radiation units. Open the
valves to these units. Make sure the boiler and
expansion tank drain cocks are closed. The air bleed
screw on the tank drain fi tting should be closed.
Open the valve in the line from the boiler to the
expansion tank. Open the water inlet to your boiler
and leave it open. Start with the lowest radiation
unit. Open the air vent on this unit. When all the air
has escaped and water starts to fl ow from the vent,
close it. Go to the next radiation unit, and repeat
this process. Repeat until you have covered every
radiation unit in the system (ending up at the highest
unit in the system). If your units have automatic
vents, this manual venting is unnecessary but it will
speed up the proper fi lling of your system.
If your system is a closed expansion tank system,
you may leave it open to refi ll the system
automatically as needed. Check the temperature
pressure gauge. Not the position of the hand
indicating pressure. This should be between 10 and
15 psi. Any lowering of this movable hand below
10 psi. Will indicate loss of water due to leakage.
The automatic fi ll valve should compensate for this.
Instructions are packages with the valve.
!
WARNING
Never run water into a hot empty boiler.
Summary of Contents for Dunkirk PVWB Series
Page 7: ...7 FIG 6 CHILLED WATER PIPING FIG 5 TYPICAL HOT WATER PIPING INSTALLATION SYSTEM PIPING ...
Page 25: ...25 NOTES ...
Page 26: ...26 NOTES ...
Page 27: ...27 Date Service Performed Company Name Tech Initials Company Address Phone ...
Page 28: ...ECR International Inc 2201 Dwyer Avenue Utica NY 13501 www ecrinternational com ...
