EB-M Installation Manual

04/15/2019 3 BI518
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. 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.
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° F or pulling a jumper peg the high temperature value is
176° F. See appropriate zone controller installation manual for details.