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This controller contains interface/logic devices, a buffer tank (BT) sensor, and an outdoor temperature (OT)
sensor. Based on the application, many other system components may be required to make your system operate
as desired. These components must be provided by the installing contractor. These components may include
but are not limited to:
- a geothermal or air-to-water heat pump
- a listed buffer tank
- water coil(s) and blowers (in the case of a forced air system)
- system pumps
- expansion tank and air eliminator
- hydronic valves and piping
- thermostats
- wiring
- transformer
- pump relays
Refer to the HX101 diagrams in this manual which show various system configurations.
Controller Power
A detailed hookup drawing (HH120) is included in this manual. A qualified electrician should perform all high-
voltage wiring tasks on this unit.
120V hookup – Model HP-BTC
120 VAC with a minimum of 10 amps of dedicated power is required to power the Electro Industries Buffer
Tank Controller model HP-BTC. We recommend wiring this product in such a way that power comes directly
from the power panel to the terminal block located inside of the lower half of the buffer tank controller
enclosure. Various "knockouts" in the controller's enclosure are included for your use and convenience. Do not
apply power to the unit until full installation is complete.
24V Hookup – Model HP-BTC-24
The HP-BTC-24 unit will not include a transformer. The controller requires 24VAC from another power source
(heat pump, air handler, gas furnace or boiler) to power the control boards internal to the Buffer Tank
Controller. In this scenario, the zone output block will output 24VAC meaning all pumps will require one
isolation relay per pump.
Multiple System Transformers
In some installations, multiple transformers exist (such as in the furnace or air handler, heat pump, and others) in
the HVAC system. Refer to the installation manuals for these products to determine if multiple transformer
compatibility issues may occur.
IMPORTANT: MULTIPLE TRANSFORMERS IN THE SAME HVAC SYSTEM ARE KNOWN TO CAUSE
SYSTEMS TO MALFUNCTION. PLEASE REFER TO THE HOOKUP DIAGRAMS AT THE END OF THIS
MANUAL FOR THE CORRECT HOOKUP CONFIGURATION FOR YOUR PARTICULAR SYSTEM.
Note:
• Model HP-BTC does include a transformer
• Model HP-BTC-24 does not include a transformer
This manual does include detailed suggested wiring for all instances with regards to low voltage wiring.
Fuses
The circuit boards and all external field connections/wiring are fuse protected with a self-resetting 3-amp fuse.
Gas furnace – if this is a "dual fuel" installation including a gas or oil backup furnace, only two wires are
required between this controller and the gas furnace. It is assumed the gas furnace logic will control its own
02/22/2012
Installation Overview
Installation and Hookup
3
HI114
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