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Offered EV heater is liquid heater type designed to be a heat
source for existing heating system instead of an ICE. All vehicle's heat controls are
retained and work the same way and apparent operation is the same. No under dash
modification or taking the dash panel out is needed. The heater simply connects to the
same heater core fittings at the firewall former engine hoses use to connect to, and
on-off control switch is installed on the dash. The switch can be a regular toggle
automotive type operated by hand, or linked to existing heat dial or lever. The water (or regular antifreeze ethylene glycol solution for cold climates) temperature in the heater's tank is maintained at 70°C±2°C (158°F±3.6°F). Electric circuit consists of resistive element immersed in liquid and controlled by a FET switch, in turn controlled by a PIC micro controller. The firmware is sophisticated enough to provide safety check and emergency shutdown if any parameters exceed specified limits or electrical connections become loose. In case of emergency the heater is able to discharge vehicle controller input capacitors. Open collector output allows to monitor status of the heater. All inputs/outputs are galvanically isolated from the high voltage (traction battery) circuit. Two models are offered: RM3 without water pump and RM4 with integrated pump. Each model has two versions with different working voltages: 100 VDC...250 VDC and 200 VDC...450 VDC, and both versions are made with 2 kW, 3 kW or 4 kW heater power. Higher power versions still has the same set point temperature but reach it sooner and still maintain it for larger cores, higher air velocity (core cooling rate) and colder outside temperatures. 16.5 mm, 18 mm or 20 mm diameter inlet and outlet fittings can be ordered. Manufactured by MES-DEA in Switzerland, one year warranty. |
