28
GE/HP –
Gas/Electric or Heat Pump. For Gas/Electric HVAC systems,
select GE. For heat pumps select HP unless heat pump uses GE thermostats
(no external reversing valve control), then select GE.
# STAGES –
Maximum number of HVAC system heat and cool stages.
ECONO CNTRL –
This feature allows the economizer to operate as an
additional stage of cooling when outdoor air conditions are acceptable. May
be used with HVAC systems that utilize an economizer.
CUT-IN
– This advanced feature separates the cut-in setpoint from the
cut-out setpoint. This permits better staging and leaving air temperature
control. Example: Without this feature, in cool mode with a cut-out
setpoint of 48 degrees, the compressor will turn off if the leaving air drops
below 48 and, after a time delay, turn back on when the air rises above
48. With this feature, if the cut-out is 48, the cut-in will be 58. If the air
drops below 48 the compressor will turn off. It will not turn on, howev-
er, until the air temperature rises above 58 and a time delay has elapsed.
This gives longer compressor running times and maintains a more com-
fortable leaving air temperature.
SETPOINT
– Number of setpoints available for heat and cool.
LEAVING AIR DISPLAY
– Digitally displays the leaving air temperature.
This is useful for troubleshooting and system monitoring.
COMPRESSOR MIN. RUN
– Runs the compressors a minimum of
four minutes whenever they are energized. This ensures proper oil return
and increased compressor life.
FAN CONTROL
– Runs the indoor blower fan during capacity cut-out.
This ensures the heat exchanger properly cools down and the AC coil
warms up during capacity cut-out. It also provides better zone tem-
perature control by providing conditioned air during capacity cut-out
periods. This feature is not provided or necessary for heat pumps because
blower fan is continuously energized as long as there is a call. This fea-
ture is also not necessary if blower fan is run continuously.
P/N
GE/HP
#
STAGES
ECONO
CNTRL
CUT-IN
SET-POINT
LEAVING
AIR
COMPRESSOR
MIN. RUN
FAN
CONTROL
101CAPGE
GE
1 HT, 1 CL
NO
NO
FULL RANGE
YES
NO
NO
TRLAT
GE
1 HT, 1 CL
NO
NO
4 HT, 4 CL
NO
NO
YES
CAPL-2
GE
2 HT, 2 CL
YES
YES
FULL RANGE
YES
YES
YES
CAPL-4
GE
4 HT, 4 CL
YES
YES
FULL RANGE
YES
YES
YES
SYCAP
HP
2 HT, 1 CL
NO
NO
FULL RANGE
YES
NO
NO
TRFPC
GE
1 CL
NO
NO
FULL RANGE
NO
NO
NO
CAPACITY CONTROLLERS
An HVAC system is sized to handle the load of an entire home or building.
Because of this, when all the zones are not calling, the load to the HVAC
system can diminish below its designed capacity. Left unchecked, the A/C
coil could freeze up causing compressor slugging or the furnace could
overheat causing premature heat exchanger failure. To compensate for
this, a Capacity Controller is needed.
The basic function of the Capacity Controller is to monitor the leaving
air temperature and cycle the unit on and off to maintain a leaving air
temperature within set parameters. Zonex Systems offers six unique capac-
ity controllers to meet all your application needs: TRLAT, 101CAPGE, CAPL-
2, CAPL-4, SYCAP and TRFPC.
CAPACITY CONTROLLER SELECTION
Select the Capacity Controller best suited for your application based on the following table and feature list.
FEATURE LIST
