Room Thermostat Placement; Two-Temperature Operation Or Feature - Electro Industries EB-MA-10 User Manual

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 – order EB-ZEA-1.
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 (EB-ZEA-1) 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. However, when using zone controller EB-ZEA-1, these are not required.

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 such as Electro Industries' ES-
24-BR. These devices only require a ¼" hole drilled in the floor at some
convenient location (preferably off a center wall, not within 2 feet of
outside wall).
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.

TWO-TEMPERATURE OPERATION OR FEATURE

When using Electro's zone controller in priority mode,
the boiler system can automatically raise the outlet
temperature with zone 1 calling. This is setup for default
of 150° or pulling a jumper peg the high temperature
value is 176°. See appropriate zone controller
installation manual for details.
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