Coil Tube Boiler Operator's Manual: Models CB-200-CTB, CB-350-CTB, and CB-500-CTB
10-7
Guidelines for CTB Setup and Operation
1.
Refer to the appropriate illustration in this section for your CTB system configuration, as well as
Figures 4A/4B in the Installation chapter.
2.
Connect the supply and return piping to the heating system. (Additional information in
Section 4).
CAUTION:
Hot water pipes shall have clearances of at least 1/2" from all combustible
surfaces. For additional technical reference material, see I=B=R Installation and Piping Guide
No. 200.
3.
The relief valve must be installed with the spindle in the vertical position. The relief valve
discharge pipe must be extended to within four inches of the floor or to a drain.
4.
To reduce the amount of cold water returned to the boiler (and to protect the boiler from thermal
shock), a return blend loop should be utilized.
5.
Fill the entire heating system with water and vent air from the system according to the following
instructions:
(a) Close the isolation valve in the boiler supply piping.
(b) Isolate all circuits by closing the zone valves or balancing valves.
(c) Attach a hose to the purge valve located just below the isolation valve in the boiler supply
piping.
NOTE:
Ensure that the end of the hose drains into a bucket located in a drain area or
outside.
(d) Starting with one circuit, open the first zone valve ONLY.
(e) Open the purge valve.
(f) Open the fill valve (the make-up water line should be located on the system side of the
isolation valve in the boiler supply piping.)
(g) Allow water to overflow from the bucket until discharge from the hose is bubble-free.
ATTENTION:
Air in the hose may cause the hose to "jump" and water to spray out;
ensure that the area (and equipment nearby) is protected from any possible water damage.
(h) Open the zone valve to the second zone to be purged, then close the first. Repeat this step
until all zones have been purged, but always have one zone open. At completion, open all
zone valves.
(i) Close the purge valve, continue filling the system until the pressure gauge reads 12 psi.
Close the fill valve.
NOTE:
If the make-up water line is equipped with a pressure reducing valve, the system
will automatically fill to 12 psi.
(j) Open the isolation valve in the boiler supply piping.
(k) Remove the hose from the purge valve.
(l) As soon as the boiler is filled, heat the water in the boiler to 180
o
F
to de-aerate the water.
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