|HTC2, 3, 4 & 5||EXPANSION MODULES|
|HRC-4||2 Stage Heat & 2 Stage Cool|
|HRC-43S||3 Stage Heat & 3 Stage Cool (For use with Triple Compressor AC Units Only)|
|HRC-4A||2 Stage Heat & 2 Stage Cool + On/Off Auxiliary Heat Stage|
|HRC-4B||2 Stage Heat & 2 Stage Cool + On/Off Economy Cycle Relay Output|
|HRC-4D||2 Stage Heat & 2 Stage Cool + On/Off Econ. Cycle Relay O/P with Comparitor Override Function|
|HRC-4DE||2 Stage Heat & 2 Stage Cool + Modulating 0-10VDC Econ. Cycle O/P with Comparitor Override|
|HRC-4E||2 Stage Heat & 2 Stage Cool + Modulating 0-10VDC Economy Cycle Output|
|HTC3 & 5||(only) expansion plug on cards|
HTC3 & 5 Heat, Econ & Cool Y signal expansion card.
HTC3 & 5 Auxillary Relay control card (as extra heat , cool or both capapability)
general use output expander modules
4 x 0-10v controlled relays from 0-10vDC Signal.
3 X 0-10v controlled relays from 0-10vDC Signal.
Multi I/O expansion module from 0-10Vdc Signal.
1 in 4 out Y signal amplifier from 0-10Vdc signal.
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