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UNDERSTANDING OUR TERMINOLOGY REGARDING "ZONES" – IN AN ATTEMPT TO CLEARLY
DESCRIBE THE FUNCTION AND FEATURES OF THE BUFFER TANK CONTROLLER, THIS MANUAL REFERS
TO THE FORCED AIR WATER COIL LOOP AND THE HYDRONIC HEATING ZONES AS SEPARATE
APPARATUSES. WE DO NOT CONSIDER THE FORCED AIR COIL A "ZONE".
Function of the Buffer Tank During Heat Calls vs. Chilled Water Calls
The hydronic zones are enabled in heating mode only. The hydronic zones will not respond to a "Y" (cooling)
call from the thermostat. The cooling function will be performed by the forced air water coil only.
NOTE: Not all installations will have a cooling load.
Zoning Pumps – HP-BTC
1. The 120-volt source for the zone pumps is derived from the same external 120V source used to power
the transformer. Therefore, the board connectors labeled "OUPUT" are energized (L1) and ready to be
used with zone pumps.
2. The "common" connections of each zone pump are tied together back to neutral on the zone control
board.
3. Pump circuits are protected with a 10-amp use located on the zone control board.
Zone Valves – HP-BTC-24
1. The 24VAC source for the zone valves is derived from the same external 24VAC source used to power
the transformer. Therefore, the board connectors labeled "OUPUT" are energized (24VAC) and ready to
be used with zone valves
2. The "common" connection of each zone valve are tied together back to common on the zone control
board.
Hydronic Zone Priority – Zone 1 Only
Located on the top right corner of the hydronic zone controller is a switch labeled "priority". With priority
switch in the ON position, all heating resources are dedicated to hydronic zone 1. The remaining hydronic
zones, along with the forced air coil, are operational only when hydronic zone 1 is satisfied.
Note that during priority mode, furnace G is interrupted and no heat is being delivered to the forced air coil
during active hydronic zone 1 heat demand. With the priority switch in the "off" position, all zones plus the
forced air coil are considered equal.
Forced Air Priority Timer
The right-hand side of the system control board has a set of jumper pins labeled SW8. The jumper is engaged as
it ships from the factory. Used "as is", the forced air water coil is treated the same as a hydronic zone during the
heating season. Removal of this jumper will initiate the start of an internal timer whenever the control board
receives a heat call from the forced air thermostat. At the conclusion of the timer period, the Buffer Tank
Controller will stop service to all hydronic zones in order to allocate 100% of the buffer tank resources to the
forced air coil for the remainder of the forced air call. The timer may be adjusted with the use of a PC computer.
Special software and a dedicated data cable are required to accomplish this. The "Buffer Tank Controller
software" and cable are available from Electro Industries. With the use of this software, the timer may be
adjusted anywhere from 30 to 90 minutes. The timer is set to 60 minutes from the factory.
02/22/2012
7
HI114
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