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Table 1 — System Matches
*Units must be field reconfigured for 1
1
/
2
ton (18,000 Btuh) operation. See Before Installation section on page 3 for details.
NOTE: Numbers in ( ) indicate quantities when there is more than one fan coil unit in the system.
Ensure unit operation within the application guidelines
shown in Table 2. When installing the outdoor unit, for cool-
ing operation when the outdoor-air temperature is below
55 F, the following accessories are required:
• low ambient kit
• crankcase heater
• winter start kit
• isolation relay (538B heat pump units only)
This will provide cooling operation down to 40 F ambient
temperature. For operation down to –20 F ambient tempera-
ture, a field-installed wind baffle will also be required.
To complete installation of the system, the following items
must be field-supplied for connection of the indoor and
outdoor units:
• refrigerant piping
• condensate drain piping
• thermostat
•wiring
For some applications, a fresh air intake, power vent fan,
and/or condensate pump kit may be required. Refer to
Tables 3A and 3B for physical data.
Table 2 — Application Range
LEGEND
*This value is for single-zone systems and may be equipped with an
accessory low-ambient control or winter start kit that will allow opera-
tion down to –20 F.
SYSTEM TYPE INDOOR SECTION NUMBER OUTDOOR SECTION NUMBER
Cooling Only
619CNF 538ANR,APR,AER
024* 018
024 024
036 030
036 036
048 048
060 060
Heat Pumps
619CNQ 538BNR,BPR,BER
024* 018
024 024
036 030
036 036
048 048
060 060
Heating/Cooling
619CNQ 538ANR,APR,AER
024* 018
024 024
036 030
036 036
048 048
060 060
COOLING
Maximum Minimum
Indoor Outdoor Indoor Outdoor
95 F DB
71 F WB
125 F DB 67 F DB
57 F WB
55 F DB*
40 F DB
HEATING (Heat Pump Systems Only)
Maximum Minimum
Indoor Outdoor Indoor Outdoor
80 F DB
71 F WB
75 F DB
65 F WB
55 F DB –20 F DB
DB — Dry Bulb
WB — Wet Bulb