Electro Industries EZB-Eco EZB-T1-05-240-1, Инструкция по установке и эксплуатации, Страница: 4 / 25

09/01/2020
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BI601
MULTIPLE ZONES AND RADIANT TEMPERATURES
Same water temperature all zones – in this case the system can be setup as one pump with the water
circulated through the boiler and directly to a manifold containing the various zone valves. Although this
model series has a built-in outlet sensing and controller mechanism for staging the elements, also consider
the next section, Zone Controller. If not using zone controller, the end switches of all of the zone valves
are paralleled and directly control R and W to turn on the boiler.
Electro Industries’ Zone Controllers – the Electro Industries’ zone controller priority zone has the
ability to communicate with this EZB-Eco Series boiler and it will automatically switch to a high water
temperature (150° F or 180° F) during zone 1, priority switch on, operation. With this feature the EZB-
Eco boiler can automatically take care of two temperature requirements thus eliminating the need for the
technique described in the paragraph above.
ZONE CONTROLLER
This EZB-Eco Series boiler controls the electric elements based upon water temperature independent of
flow; therefore, in theory, a staging zone controller is not required; however, there are three suggestions
or reasons why a zone controller can simplify the installation and enhance overall performance.
1. Zone wiring and troubleshooting convenience – the addition of the zone board allows for easy
terminal block and point to point wiring for each zone thermostat and each zone valve. Also there
are LED’s associated with the thermostat action and the zone valve action. This greatly simplifies
wiring and future troubleshooting with a neat terminal block wiring arrangement and the onboard
LED’s.
2. Prevents over control or false staging up and down when the temperature sensors are
attempting to regulate
– since Electro Industries’ zone controllers 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 VALVES/CIRCULATORS
It is recommended to use zone valves in multi-zone applications with the EZB-Eco boiler.
ROOM THERMOSTAT PLACEMENT
Fin tube radiation, fan coil, etc. – heat only wall thermostat, connected to operate zone valves (see
previous section) or for single zone the thermostat is connected directly to EZB-Eco 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