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3. Two temperature system with unbalanced zones – if the application includes zone one requiring high
temperature 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
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 two 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° (for this EB-MS series do not recommended the
high temperature 176° selection). See appropriate zone
controller installation manual for details.
03/19/2009
3
BI508
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