Rinnai 37AHA Series Training Manual page 9

Basic Sequence of Operation
Typical Open Loop-Case coil operation for A/C or Heat Pump
• When the thermostat calls for cooling from the A/C, circulation occurs from the condenser
through the evaporator coil
• Air is blown across the evaporator coil moving cool air into structure (no time delay)
• Similarly, when the thermostat calls for heating from the heat pump, circulation occurs from
the evaporator-coil through the condenser
• Air is blown across the evaporator-coil moving warm air into structure (no time delay)
Rinnai Corporation Hydronic Air Handler 101 Training Manual
9