Bryant 538PR - Sequence of Operation; Modes of Operation

25
Fig. 24 – Condenser temperature protection
Fig. 25 – Condenser temperature protection
Condenser temperature protection
The condenser temperature protection function acts as follows:
— If the condenser coil temperature (T3) is between 131_F
and 140_F (55C_<T3<60_C), the compressor frequency
will decrease to a lower level until it reaches the lowest
value, F1. It then runs at this F1 frequency. Once
T3<129_F(54_C), the compressor will continue running
at the current frequency.
— Condenser temperature protection (131_F(55_C ))<T3
<140_F(60_C)). The compressor frequency will
decrease to the lower lever until to F1 and then runs at
F1. If T3<129.2_F(54_C)), the compressor will keep
running at the current frequency. T3<125.6_F(52_C)),
the compressor will not limit the frequency and resume
to the former frequency.
— When the coil temperature reaches a value lower than
126_F(52_C), the compressor will not limit the
frequency and resumes to the required frequency.
— If T3>140_F(60_C) for 5 seconds, the compressor will
stop and restart once the coil temperature reaches a value
lower than 126_F(52_C).
Evaporator Temperature Protection
The evaporator temperature protection function acts as follows:
— If the evaporator coil temperature (T2) is lower than
32_F(0_C), the compressor will stop and restarts once
T2 ≥ 41_F(5_C).
— T2<32_F(0_C), the compressor will stop and restart
when T2≥41_F(5_C).
—32_F(0_C)≤ T2<39.2_F(4_C), the compressor
frequency will be limited and decreased to the lower
level.
— 39.2_F(4_C)≤T2≤44.6_F(7_C), the compressor will
keep the current frequency.
— T2>44.6_F(7_C), the compressor frequency will not be
limited.
—If32_F ≤ T2 <39_F(0_C ≤T2 <4_C), the compressor
frequency will be limited and decreased to a lower level.
—Now,if39_F ≤T2 <45_F(4_C ≤T2 <7_C), the
compressor continue running at the current frequency.
— If T2>45_F(7_C), the compressor frequency will not be
limited, and operation is normal.
SEQUENCE OF OPERATION
Interface
A wireless remote control, supplied with the unit, is the interface
between the fan coil and the user. The wireless remote control has
the following characteristics:
S Capable of displ aying _Cand_F with _F being the default
set t ing. To change the def ault se tting, re fe r to the Owne r’s
Ma nual.
S The remote control setpoint range is from 62_F(17_C) to
86_F(30_C) in increments of 1_F(1_C).
S The wireless remote control has an operating range of 25 ft.
(7.62 m).
S The same remot e c ontrol c an be used to cont rol more t han one
unit.
S If the rem ote control is lost, damage d, or the bat te ries are
exhaus ted, the sys t em can be operated by using the manua l button
(force d Auto) loc at ed under the fr ont panel.
Manual Button
AUTO/COOL
Fig. 26 – Manual Button Location on Unit
MODES OF OPERATION
COOLING MODE
In this mode, the system cools and dries the room air with the fan
running continuously, either at a selected fan speed or Auto fan
speed. The fan runs even when the compressor cycles off. This
feature enhances room comfort and efficiency of the system.