CLEAN BURN CB-200-CTB, Operator'S Manual

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Coil Tube Boiler Operator's Manual: Models CB-200-CTB, CB-350-CTB, and CB-500-CTB
10-4
CTB System Function and Configuration (continued)
In a Primary/Secondary Pumping System (as shown in Figure 10A), the primary loop circulator runs when any
of the zones call for heat. In some system setups, the circulator may run continuously during the heating season.
The circulator pushes hot water past the zone tees; any of the secondary zone pumps can draw hot water out of
the first tee (as though the tee were a boiler). Each zone then returns cooler water through the second tee
where it mixes with the hot water being pushed through by the primary loop circulator.
The close positioning
of the two zone tees is crucial to the operation of the system; the tees must be at least 6" but not
more than 12" apart.
This allows for circulators of different flow rates to be used in the same system while
maintaining proper flow and functioning.
CTB Setup Options
When designing and setting up the CTB Hydronic System, please be aware of the following options and special
setup requirements:
(1) The boiler circulator (which you may have ordered from Clean Burn for your CTB system) is
sized to ensure a flow of water through the coil tube ONLY; it is NOT sized to be used as a system
circulator. The boiler circulator must be installed according to Figures 10B and 10C, after the mixing valve. An
additional circulator must be installed to flow water through the system and to the boiler.
(2) In low load conditions, Clean Burn recommends the installation of a larger storage tank next to the
CTB to extend the run time and to reduce the occurrence of short cycling. Position the tank close to the
boiler to reduce the required connective piping as shown in sample configuration, Figure 10B.
(3) If hot water is required in the system installation for washing or other related activities, Clean
Burn offers Ergomax Heat Exchangers/Storage Tanks in various sizes . Contact your local Clean Burn
representative for additional details on these CTB system components. Refer to Figure 10C for a sample
system configuration using an Ergomax Heat Exchanger. This configuration is ideal for installations requiring
pressure washing, car/truck washing, etc. The Ergomax unit works well with a CTB because it stores boiler
water in the tank and acts as a buffer (tempering) tank while enabling reduction of short cycling.