Coolerado Installation
Page 31 of 63
Appendix 6: Thermostat Operation (TEC3620)
Note: The Johnson Control TEC3620 has been adapted to work with the Coolerado Water Control Board and
variable speed fan motor. The Water Control Board requires a 24 VAC for cool call and is taken from the FAN
terminal. The Variable Speed Motor requires a 2 to 10 VDC control voltage and is taken from the CLG
terminal.
Front Cover of Thermostat
There are many options and scheduling modes that are available with this thermostat. See Johnson Controls
“TEC300 Series Proportional Fan Coil and Zoning Thermostat Controllers with Dehumidification Capability,
Installation Instructions” for full instructions
There are several settings that must be used to operate the Coolerado Equipment and have been factory set:
1) Under Display Settings / Show Fan Icon: must be “No” as this is used as a cool call not fan setting. The Fan
Icon allows three settings that will cause the unit not to operate as expected.
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