Installation guide

Tables 3 & 4 show both heating and cooling airflows. Refer to
these tables to determine the airflow for the system being installed.
NOTE: Be sure that all supply-and return-air grilles are open,
free from obstructions, and adjusted properly.
Airflow can be changed by changing the set up pins on the Easy
Select board.
Unit 50XZ utilizes state of the art ECM (Electronic Computated
Motor) ID Blower Motors.
Step 4 -- Defrost Control
QUIET SHIFT
Quiet Shift is a field-selectable defrost mode, which will eliminate
occasional noise that could be heard at the start of defrost cycle and
restarting of heating cycle. It is selected by placing DIP switch 3
(on defrost board) in ON position.
When Quiet Shift switch is placed in ON position, and a defrost is
initiated, the following sequence of operation will occur. Reversing
valve will energize, outdoor fan will turn off, compressor will turn
off for 30 sec and then turn back on to complete defrost. At the
start of heating after conclusion of defrost reversing valve will
de-energize, compressor will turn off for another 30 sec, and the
outdoor fan will stay off for 40 sec, before starting in the Heating
mode.
DEFROST
The defrost control is a time/temperature control which includes a
field-selectable time period (DIP switch 1 and 2 on the board)
between defrost cycles of 30, 60, 90, or 120 minutes (factory set at
30 minutes). To initiate a forced defrost, two options are available
depending on the status of the defrost thermostat.
If defrost thermostat is closed, speedup pins (J1) must be shorted
by placing a flat head screw driver in between for 5 sec and
releasing, to observe a complete defrost cycle. When the Quiet
Shift switch is selected, compressor will be turned off for two 30
sec intervals during this complete defrost cycle, as explained
previously. When Quiet Shift switch is in factory default OFF
position, a normal and complete defrost cycle will be observed.
If defrost thermostat is in open position, and speedup pins are
shorted (with a flat head screw driver) for 5 sec and released, a
short defrost cycle will be observed (actual length is dependent
upon the selected Quiet Shift position). When Quiet Shift switch is
in ON position, the length of defrost is 1 minute (30 sec
compressor off period followed by 30 sec of defrost with
compressor operation). On return to heating operation, compressor
will again turn off for an additional 30 sec and the outdoor fan for
40 sec. When the Quiet Shift is in OFF position, only a brief 30
sec. cycle will be observed.
Table 3 - 50XZ Cooling & Heating Dry Coil ECM Airflow
Small Cabinet
CFM ADJUST PIN
SELECT
UNIT
EXTERNAL STATIC
SIZE
PRESSURE RANGE
(in. wc)
COOLING*
COOLING
024 DEHUMIDIFY
HEAT PUMP
COMFORT
COOLING*
COOLING
030 DEHUMIDIFY
HEAT PUMP
COMFORT
COOLING*
COOLING
036 DEHUMIDIFY
HEAT PUMP
COMFORT
7pEfficiency and Cooling pit
0.0-0.39
8OO
715
72O
1010
89O
945
1110
99O
1035
selections de
LO PIN
0.4-0.69
725
67O
66O
92O
845
850
1025
96O
975
iver equal airflow
0.7-1.0
825
795
765
97O
910
910
0.0-0.39
885
715
79O
1105
89O
1020
1235
99O
1160
NOM PIN
0.4-0.69 0.7-1.0
805 730
695 645
745 685
1030 930
865 825
965 895
1175 1115
975 940
1080 1020
0.0-0.39
99O
795
89O
1255
1010
1140
1400
1125
1305
HI PIN
0.4-0.69
93O
775
85O
1160
98O
1105
1355
1110
1275
0.7-1.0
855
745
785
1050
925
995
1280
1085
1220
UNIT SIZE
042
048
060
Heat Pump Effi
Table 4 - 50XZ Cooling & Heating Dry Coil ECM Airflow
Large Cabinet
CFM ADJUST PIN SELECT
EXTERNAL STATIC
PRESSURE RANGE (in. wc)
COOLING*
COOLING DEHUMIDIFY
HEAT PUMP COMFORT
COOLING*
COOLING DEHUMIDIFY
HEAT PUMP COMFORT
COOLING*
COOLING DEHUMIDIFY
HEAT PUMP COMFORT
",iency and Cooling pin selections de
LO PIN
0.1-1.0
1100
98O
99O
1260
1120
1135
1575
1400
1415
iverequalairflow
NOM PIN
0.1-1.0
1225
98O
1100
1400
1120
1260
1750
1400
1575
HI PIN
0.1-1.0
1410
1125
1265
1610
1290
1450
2010
1610
1810
Table 5 - ECM Wet Coil Pressure Drop (in. wc)
UNIT STANDARD CFM (SCFM)
SIZE 600 700 800 900 1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 2000 2100
024 0.005 0.007 0.010 0.012 0.015 ......
030 0.007 0.010 0.012 0.015 0.018 0.021 0.024 ....
036 - 0.019 0.023 0.027 0.032 0.037 0.042 0.047 - - -
042 - - 0.014 0.017 0.020 0.024 0.027 0.031 0.035 0.039 0.043 - -
048 - - - 0.027 0.032 0.036 0.041 0.046 0.052 0.057 0.063 0.068 -
060 .... 0.029 0.032 0.036 0.040 0.045 0.049 0.053
19