Product Manual

05/19/2016 3 BI514
2. Prevents over control or false staging up and down when the temperature sensors are
attempting to regulate – since Electro Industries’ zone controllers also have staging “smarts”, the
addition of the zone controller will provide smoother boiler temperature control. The zone board has
a dial switch for each zone and the installer selects one of four zone capacity sizes. When dialing in
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.