Fan Operation For Heat; Zone Caller; System Mode; Equipment Operation - Carrier 33CS Installation, Service, And Troubleshooting Instructions

Fan Operation For Heat —
For Heat option is set to OFF and the fan switch is set to
AUTO, the fan relay is energized by the TEMP system ther-
mostat only during a system cooling mode. During a system
heating mode, the heating/cooling equipment is responsible
for fan operation.
When the Fan Operation For Heat option is set to ON and
the fan switch is set to AUTO, the fan relay is energized by
the TEMP system thermostat during system heating and cool-
ing modes.
To configure the Fan Operation For Heat option, set cat-
egory 4, option 1. Use the left set point buttons to toggle the
option ON and OFF.
Zone Caller —
If the TEMP system thermostat has suf-
ficient zone demand to energize the heating/cooling equip-
ment, it is a zone caller. A zone cooling caller has a demand
of 1.5° F or greater for cooling. A zone heating caller has a
demand of 1.5° F or greater for heating.
System Mode —
System mode is the operation con-
figuration the TEMP system thermostat uses to determine
the operation of the system and heating/cooling.
For a TEMP system, the TEMP system thermostat checks
its own zone demand. If the TEMP system thermostat is a
cooling caller, system cooling mode is selected. If the TEMP
system thermostat is a heating caller, system heating mode
is selected.
The TEMP system thermostat releases a system heating
or cooling mode when:
• the zone demand is satisfied to 0.5° F.
• both first and second stage heating or cooling temperature
limits are exceeded when the zone is no longer a zone caller.
• the Heating or Cooling Temperature Lockouts option is
set to ON and the outside-air temperature exceeds the lock-
out temperature set point.
Equipment Operation —
stat operation of the heating, cooling, and reversing valve
relays is determined by the zone demand. The Auxiliary Re-
lay option configures the TEMP system thermostat for equip-
ment operation.
During a system mode, a stage of heating or cooling can-
not be energized in less than 3 minutes after the previous
stage has been energized. Once a heating or cooling stage
has been energized, it remains on until system heating or
cooling mode is released or trips due to a limit being ex-
ceeded. The reversing valve relay, energized or deenergized,
remains constant until a change of system modes.
AUXILIARY RELAY — The Auxiliary Relay option con-
figures the way the auxiliary relay will be controlled by the
TEMP system thermostat. When the option is set to 0, the
TEMP system thermostat will not control the auxiliary relay.
When the option is set to 1, the TEMP system thermostat
will control the auxiliary relay based on the occupancy sched-
ule. When the option is set to 2, the TEMP system thermo-
stat will control the auxiliary relay under IAQ control. When
the option is set to 3, the TEMP system thermostat will con-
trol the auxiliary relay as a reversing valve in a heat pump
system based on system heating or cooling modes. When
the option is set to 4, the TEMP system thermostat will con-
trol the auxiliary relay to enable or disable economizer con-
trol. The Auxiliary Relay option is set in category 4, option
9. The default is 0.
EQUIPMENT OPERATION DURING A SYSTEM COOL-
ING MODE — The TEMP system thermostat utilizes the
relay pack to energize the reversing valve relay (if option
4.9 is set to 3) when the system cooling mode is selected.
The first stage of cooling is energized 30 seconds after sys-
tem cooling mode is selected. When the reference zone
When the Fan Operation
The TEMP system thermo-
cooling demand is 2.0° F or greater, the second stage of cool-
ing is energized or optimized staging is followed. The sec-
ond stage of cooling is released when demand drops below
1.0° F. The first stage of cooling is deenergized when the
system cooling mode is released.
EQUIPMENT OPERATION DURING A SYSTEM HEAT-
ING MODE — The TEMP system thermostat utilizes the
relay pack to deenergize the reversing valve relay (if option
4.9 is set to 3) when the system heating mode is selected.
The first stage of heating is energized 30 seconds after sys-
tem heating mode is selected. When the reference zone heat-
ing demand is 2.0° F or greater, the second stage of heating
is energized or optimized staging is followed. The second
stage of heating is released when demand drops below
1.0° F. The first stage of heating is deenergized when the
system heating mode is released.
Equipment Operation With Economizer Con-
trol —
The TEMP system thermostat operation of the heat-
ing, cooling, and economizer relays is determined by the system
mode, the reference zone demand, and the outdoor air tem-
perature. The Auxiliary Relay option must be set to 4 to con-
figure the TEMP system thermostat for equipment operation
with economizer control.
During a system mode, a stage of heating or cooling can-
not be energized in less than 3 minutes after the previous
stage has been energized. Once a heating or cooling stage
has been energized, it remains on until system heating or
cooling mode is released.
EQUIPMENT OPERATION DURING A SYSTEM COOL-
ING MODE
Outside-Air Temperature Greater Than 65 F —The TEMP
system thermostat utilizes the relay pack to energize the first
stage of cooling after system cooling mode is selected. When
the referene zone cooling demand is 2.0° F or greater, the
second stage of cooling is energized or optimized staging is
followed. The second stage of cooling is released when de-
mand drops below 1.0° F. The first stage of cooling is deen-
ergized when the system cooling mode is released.
Outside-Air Temperature Greater Than or Equal to 55 and
Less Than or Equal to 65 F —The TEMP system thermostat
utilizes the relay pack to energize the outside air economizer
after system cooling mode is selected. When the reference
zone cooling demand is 2.0° F or greater, the first stage of
cooling is energized or optimized staging is followed. The
second stage of cooling is energized when the reference zone
cooling demand is 2.5° F or greater and the first stage of
cooling is energized. The second stage of cooling is released
when demand drops below 1.0° F. The economizer relay and
the first stage of cooling are deenergized when the system
cooling mode is released.
Outside-Air Temperature Below 55 F– The TEMP system
thermostat utilizes the relay pack to energize the outside air
economizer after system cooling mode is selected. When the
reference zone cooling demand is 2.0° F or greater, the first
stage of cooling is energized or optimized staging is fol-
lowed. The first stage of cooling cannot be energized until
5 minutes after the economizer relay has been energized. The
second stage of cooling is energized when the reference zone
cooling demand is 2.5° F or greater and the first stage of
cooling is energized. The second stage of cooling is released
when demand drops below 1.0° F. The economizer relay and
the first stage of cooling is deenergized when the system cool-
ing mode is released.
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