Sequence Of Operation - Rinnai 37AHA04508KA5 Installation, Operation And Maintenance Manual

Sequence of Operation

SEQUENCE OF OPERATION:
NOTE: Air Handler control must be grounded for
proper operation; control is grounded through
green wire routed to control box screw.
STANDBY MODE:
All control outputs are off and the control is waiting for
a thermostat demand. The control initiates action
when a thermostat call is received.
COOLING MODE:
Single-Stage Air-Conditioning (A/C) Cooling
Demand:
When the thermostat calls for cooling (Y), the control
energizes the COOL_HI blower tap after a 1 second
on delay period.
When the thermostat removes the call for cooling (Y),
the control de-energizes the COOL_HI blower tap after
a cooling off delay period of 30 seconds.
A call for cooling has priority over a thermostat blower
demand.
If a call for heat (W) exists with a call for cooling, the
call for heat shall proceed as normal except the blower
remains energized on the COOL_HI speed tap. If the
call for cool goes away while a call for heat exists, the
cooling off delay is canceled and the blower operation
reverts to the heat cycle.
Two-Stage A/C Cooling Demand:
When the thermostat calls for cooling (Y), the control
waits for a 1 second cooling on delay period and
energizes the COOL_LO blower tap. If a 2
cooling (Y2) call is sensed, the control de-energizes
the COOL_LO blower tap and energizes the COOL_HI
blower tap after a 1 second delay.
When the thermostat removes the call for 2nd stage
cooling (Y2), the control de-energizes the COOL_HI
blower tap and energizes the COOL_LO blower tap.
When the thermostat removes the call for cooling (Y),
the control de-energizes the COOL_LO blower tap
after a cooling off delay period of 30 seconds.
If a call for heat (W) exists with a call for 2nd stage
cooling, the call for heat shall proceed as normal
except the blower remains energized on the COOL_HI
speed. If the call for cool goes away while a call for
heat exists, the cooling off delay is canceled and the
blower operation reverts to the heat cycle.
24
Single-Stage Heat-Pump (HP) Cooling Demand:
When the thermostat calls for cooling (Y and O), the
control waits for the 1 second cooling on delay period
and energizes the COOL_HI blower tap.
When the thermostat removes the call for cooling (Y
and O), the control de-energizes the COOL_HI blower
tap after a cooling off delay period of 30 seconds.
A call for cooling has priority over a thermostat blower
demand.
If a call for emergency heat (W) exists with a call for
cooling, the call for heat shall proceed as normal
except the blower remains energized on the COOL_HI
speed tap. If the call for cool goes away while a call
for emergency heat exists, the cooling off delay is
canceled and the blower operation reverts to the heat
cycle.
Two-Stage HP Cooling Demand:
When the thermostat calls for cooling (Y and O), the
control waits for the 1 second cooling on delay period
and energizes the COOL_LO blower tap. If a second
stage cooling (Y2) call is sensed, the control de-
energizes the COOL_LO blower tap and energizes the
COOL_HI blower tap after the 1 second delay.
When the thermostat removes the call for 2nd stage
cooling (Y2), the control de-energizes the COOL_HI
blower tap and energizes the COOL_LO blower tap.
When the thermostat removes the call for cooling (Y),
the control de-energizes the COOL_LO blower tap
after a cooling off delay period of 30 seconds.
If a call for emergency heat (W) exists with a call for
nd
stage
2nd stage cooling, the call for heat shall proceed as
normal except the blower remains energized on the
COOL_HI speed. If the call for cool goes away while a
call for emergency heat exists, the 2nd stage cooling
off delay is canceled and the blower operation reverts
to the heat cycle.
HEATING MODE:
Heating Operation: Air-Conditioning (A/C) Mode -
Configured for Flow Sensor (FS) Input:
Circulating Pump Operation:
On a call for heating, terminal "W" of the thermostat is
energized. The control monitors the FS input and
energizes the circulating pump if the FS signal is
present.
Rinnai Corporation Hydronic Air Handler Manual