Modular water source heat pump90kw-1280kw LCD controller panel ,Easy installation,,easy maintaince Refrigerant: R407C, R22 Modular water ... relay, control circuit breaker, microprocessor control with function display.LCD display as standard.Automatic operation dramatically reducing maintenance cost thanks ... , school, etc.OPTIONAL 1, Desuperheater as optional.2, Electronic controller with BMS system.