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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 sec-
tion 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 cooling
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 (38QRR 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
• power and control wiring
For some applications, a fresh air intake, power vent fan,
and/or condensate pump kit may be required.
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
operation down to –20 F.
SYSTEM TYPE INDOOR SECTION NUMBER OUTDOOR SECTION NUMBER
Cooling Only
40QAC 38HDR-3,5,6
024* 018
024 024
036 030
036 036
048 048
060 060
Heat Pumps
40QAQ 38QRR-3,5,6
024* 018
024 024
036 030
036 036
048 048
060 060
Heating/Cooling
40QAQ 38HDR-3,5,6
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