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blower based upon a gas-W heating call.
Gas or Electric Boilers – Only two wires are required between this controller and the auxiliary boiler. It is
assumed the boiler's logic will control its own pumps based upon a gas-W heating call.
Thermostats
In all applications, there will be a necessity to interface thermostats for hydronic heating zones. There is also a
possibility that the HVAC system design will include a requirement to service forced air load. If this is the case,
there will be a requirement for hydronic thermostat hookup and forced air thermostat hookup. Below is
information on required thermostats for each heating system type.
Note: If no forced air load exists within the make up of this HVAC system, disregard the comments on forced
air hookup.
Forced Air Thermostat Information
1. To service the forced air coil loop, this Buffer Tank Controller requires a conventional heat/cool,
1H/1C, 4-wire thermostat. This thermostat will connect to the upper right hand corner of the logic
controller terminal labeled "STAT".
2. In all forced air applications, a connection must be made between all thermostat terminals – R,W,G,Y
Hydronic Thermostat Hookup
1. Connect the slab stat or temperature sensing thermostat wires coming from the hydronic zones to the top
terminal block "R" and the numbered "W" terminal block located on the zone control circuit board. If
using Electro-Stat, a "Common" is required at each Electro-Stat. Connect the thermostat serving the
forced air coil loop to the "stat" terminal block located on the control board. Drawings included in this
manual show typical hookups for various thermostats. Connect per your selected thermostat.
2. If using hydronic priority feature, zone 1 and connected stat 1 must be the priority zone.
3. This buffer tank controller is not compatible with power robbing thermostats.
Thermostat Heat Anticipator/CPH Setting
If your thermostat has an anticipator setting, set the anticipator to 0.2 or less. If your thermostat has a "cycles
per hour" setting, set it to 2 cycles per hour.
02/22/2012
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HI114
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