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4.21 LOGIC BOARD REPLACEMENT
Control configuration is preset at the factory and resetting of the parameters is not advised. If a replacement Logic
Board is installed, it is necessary to match the configuration jumpers (see Figure 1-6) to the original board. Table 4-3
provides a list of jumper functions. Carrier is not responsible for failures or damage resulting from unauthorized
changes.
Configuration
A.
High Reheat -- When this configuration is removed, the unit will default to high speed in reheat
mode and in the low speed cool band. If not removed, heat/reheat will default to low speed.
B.
High Vent -- When this configuration is removed, the unit will default to high speed in vent
mode. If not removed vent mode will default to low speed.
C.
Dry Heat -- When this configuration is removed, the unit will run on 100% reheat instead of
heat.
D.
Reheat/Cycle -- When the reheat cycle configuration is removed, the unit is in reheat mode.
The default configuration is cycle clutch mode.
E.
Transducers -- When the transducer configuration is removed, transducers will assume to be
present.
F.
Refrigerant R--22/R--134a -- When the refrigerant configuration is removed, the refrigerant is
set for R--22. The default refrigerant is R--134a.
G.
Unit Type -- Rearmount unit enabled with "G" removed and "H" installed.
H.
Unit Type -- With "H" removed and "G" installed, roof top unit will be enabled.
I.
Factory -- Reserved for the manufacturer.
J.
Invert H
be inverted.
K.
Voltage -- When this configuration is removed, the voltage selection will be changed from 12 to
24 vdc.
L.
Factory -- Reserved for the manufacturer.
M.
Psig/Bars -- When this configuration is removed, the display will indicate pressures in bars.
When not removed, the display will indicate pressures in psig.
°C/°F -- When this configuration is removed, the display will show temperatures in °F. When not
N.
removed the display will show temperatures in °C.
O.
PI Reheat -- When this configuration is removed, reheat mode will use the PI algorithm to vary
the duty cycle of the heat valve. If it is not removed, the heat valve will be on constantly.
P.
Low Ambient Lockout -- When this configuration is removed, the compressor clutch will disen-
gage at 25°F. With this configuration in place, the compressor will disengage at 45°F.
T-356
Table 4-3. Logic Board Configuration
O -- When this configuration is removed, the logic for the water temperature switch will
2
Description
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03/11
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