Cascading heat recovery using a cooling unit as a source

A heating, ventilation, and air conditioning (HVAC) system, comprising:

• a cooling unit configured to deliver cooling to a cooling load, the cooling unit including:
• a cooling condenser in fluid communication with an evaporator, the evaporator in fluid communication with a recovery condenser, the cooling unit is configured to deliver cooling to a cooling load by way of a heat exchange relationship of the evaporator of the cooling unit with one or more of the cooling condenser and the recovery condenser, the recovery condenser configured as a heat source;
• a heating unit configured to deliver heating to a heating load, the heating unit including:
• an evaporator in fluid communication with a heating condenser, the heating unit configured to deliver heating to a heating load by way of a heat exchange relationship of the evaporator of the heating unit with the heating condenser;
• a heat recovery circuit configured to transfer a source heat from the cooling unit to the heating unit;
• a controller configured to control a heat recovery cycle of the HVAC system to use the heat recovery circuit, the controller selecting to provide heat from the cooling unit to the heating unit in the heat recovery cycle, the heat recovery circuit configured to transfer source heat from the cooling unit to the heating unit in the heat recovery cycle;
• a three way valve that is fluidly connected between the recovery condenser and the evaporator of the heating unit, and
• the HVAC system is configured to operate in one or more of a cooling mode, a heating mode, and the heat recovery cycle.