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BI515
the size closest to the zone Btu/h capacity, the zone controller “smarts” only allows the appropriate
boiler stage which can handle that capacity. Also this is additive if more than one zone calls at any
one time.
3.
Two temperature system with unbalanced zones
– if the application includes zone one requiring
high temperature (fin tube, air handler, etc.) and the remaining zones are radiant floor low
temperature, this zone controller will automatically raise the output of the high temperature zone.
This is a priority arrangement, zone 1 holds off the other zones while the high temperature output is
heating. If at the end of the high temperature zone there is a call on any of the low temperature
zones (up to three plus slave 4), there will be a pump only function until the outlet temperature drops
below the front panel dial setting.
ZONE CIRCULATORS
The EE-5051 switching relay can be used to interface line voltage pumps with the boiler R and W control
terminals, see drawing BH008. This switching relay can be combined with the above zone controller board.
ROOM THERMOSTAT PLACEMENT
Fin tube radiation, fan coil, etc. –
heat only wall t-stat, connected to operate zone valves (see previous
section) or for single zone the t-stat is connected directly to Electro-Boiler R and W.
Floor radiant
– comfort and proper space heating response is a direct relationship to the thermostat type
and the placement of the thermostat sensing bulb. Typically an under floor heating system can be broken
down into three categories.
A.
Energy storage, water tubing is under the concrete or within the sand
base
– the controlling thermostat must have a remote bulb, and this remote
bulb must sense the concrete slab temperature (slab stat). Coordinated with
the concrete pour, install a ¾” PVC, minimum bend radius of 7 inches, and
locate at approximately center (vertical) of the concrete slab. The thermostat
sensing bulb can later be pushed down this PVC conduit. If the slab is already
poured without conduit for slab stat, use electronic remote sensing thermostat.
B.
Floor covering, medium to high insulation
– use slab stat as described in paragraph A above.
C.
Quick response, hydronic tubing just under the concrete surface, no flooring material over the concrete
– in this case, heated water can directly radiate into the room, a standard wall mount room thermostat is
adequate. Mount room thermostat on an inside wall similar to most heating systems.
MULTIPLE BOILERS
This boiler series now includes a method for automatically staging any
number of parallel-plumbed boilers. Order plug-in relay EB-C-STG5.
The thermostat is connected only to the first boiler, when all stages are
on for more than 5 minutes, this new plug-in relay module turns on the
next boiler (R and W), and a second EB-C-STG5 could be used to turn
on the third, etc.
