Sequence Of Operation - Rheem RHWB-04WMP36A Installation Instructions Manual

SEQUENCE OF OPERATION

COOLING
Single Stage Cooling
• When the thermostat calls for cooling
(Y), there is a 1 second delay then
the control energizes the high blower
tap (COOL_HI).
• When the thermostat ends the call for
cooling (Y), there is a 30 second
cooling off delay then the control de-
energizes the high blower tap
(COOL_HI).
• A call for cooling has priority over
continuous fan.
HEATING (HYDRONIC)
• When the thermostat "calls for heat,"
the circuit between R and W is
completed. The control monitors the
FS input and energizes the circulating
pump if the FS signal is present. The
indoor blower will then be activated.
If the FS signal is NOT present, the
control will energize the circulating
pump for 60 seconds in an attempt to
activate the Flow Switch (FS). If the
FS signal does not become active
during this time, the control will de-
energize the pump wait 60 seconds
and then retry the sequence until the
FS signal is present. During this time
the Status LED will rapidly flash,
indicating that a heat demand is
present, but not being satisfied
because of the state of the FS input
signal.
HEATING (Heat pump is the
primary source of heat)
Single Stage Heating
• The thermostat calls for heating (Y,
R, and B), there is a 1 second delay
then the control energizes the high
blower tap (COOL_HI).
• When the thermostat ends the call for
cooling (Y), there is a 30 second
cooling off delay then the control de-
energizes the high blower tap
(COOL_HI).
• When the thermostat calls for
emergency heat (W), the hydronic
heating mode is activated.
22
BLOWER TIME DELAY (HEATING
OR COOLING)
All models are equipped with a blower
time delay (BTD) in lieu of a blower relay
(BR) (see Figure 19). The blower will run
for 30 seconds after the blower time
delay (BTD) is de-energized.
DEFROST (DEFROST HEAT
CONTROL)
• For sequence of operation of defrost
controls, see outdoor heat pump
installation instructions.
• Supplemental heat during defrost can
be provided by connecting the purple
(PU) pigtail in the outdoor unit to the
W on the thermostat. This will
complete the circuit between R and W
through a set of contacts in the defrost
relay (DR) when the outdoor heat
pump is in defrost. This circuit, if
connected, will help prevent cold air
from being discharged from the indoor
unit during defrost.
• For most economical operation, if cold
air is not of concern during defrost, the
purple wire can be left disconnected.
Supplemental heat will then come on
only when called for by second stage
room thermostat.
EMERGENCY HEAT (HEATING
HEAT PUMP)
• If selector switch on thermostat is set
to the emergency heat positioin, the
heat pump will be locked out of the
heating circuit, and all heating will be
hydronic heat. Jumper should be
placed between W and E on the
thermostat sub-base so that the
electric heat control will transfer to the
first stage heat on the thermostat. This
will allow the indoor blower to cycle on
and off with the electric heat when the
fan switch is in the auto position.
ROOM THERMOSTAT
(ANTICIPATOR SETTING)
See instructions with outdoor section,
condensing unit or heat pump for
recommended room thermostats.
• The thermostat should be mounted
4 to 5 feet above the floor on an
inside wall of the living room or a
hallway that has a good air
circulation from the other rooms
being controlled by the thermostat.
It is essential that there be free air
circulation at the location of the
same average temperature as other
rooms being controlled. Movement
of air should not be obstructed by
furniture, doors, draperies, etc. The
thermostat should not be mounted
where it will be affected by drafts,
hot or cold water pipes or air ducts
in walls, radiant heat from
fireplaces, lamps, the sun, T.V. or
an outside wall. See instructions
sheet packaged with thermostat for
mounting and installation
instructions.