koolrv.com VS.

undermountac.com

This is for existing customers that already have a HVAC kit, but would like to upgrade to the 4" NextGen thermostat and Espar Heat box. Please note. This is ONLY compatible with the part number heaters at the bottom of this page and the part number must be on the heater and not a superseded number. Newer generation heaters are not compatible and will not communicate. We recommend the non communicating version of the heat box and using Relay 1 as on/off for the heater. Includes: Heat functionality enabled on our NextGen thermostat with 3m control wiring to the Heat module. 12' wiring to the 4 way electric valve 4 way Electric valve with pre-cut hose to connect to HVAC evaporator Standoff plate to level electric valve Heat module with 4 relays and Espar canbus module included Please see video below explaining functionality: Espar Compatibility: 252933 HG HS3 D4E 12V CS252934 HG HS3 D5E 12V CS202007 HG HS3 B4E 12V CS202008 HG HS3 B5E 12V CS252696 HG HS3 D5L 24V CS252745 HG HS3 D6L 24V CS252721 HG AS2 D2L 12V252726 HG AS2 D2L 24V252720 HG AM2 D4L 12V252729 HG AM2 D4L 24V201987 HG AM2 B4L 12V252746 HG AM2 D4R 12V