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8
Refrigerant Charge
The 38HDR and 38QRR units can be matched with multiple
outdoor units and thus additional charge might be required when
matched with the 40QAC or 40QAQ units.
Table 5 – Additional Charge
Additional Charge lb. (kg.)
UnitSize 38HDR 38QRR
018 0.7 (0.32) 0.7 (0.32)
024 1.3 (0.59) 0.8 (0.36)
030 1.4 (0.64) 0
036 0.2 (0.1) 0.5 (0.23)
048 0.2 (0.1) 0
060 0.5 (0.23) 0
Note: The above additionalchargeisrequiredamount for line lengths upto
25 ft(7.6 m). For linelengthsexceeding 25 ft (7.6 m), additional charge will
be required. Refer to the Duct FreeSplitsLong Line Guide.
Metering Device
The 40QAC and 40QAQ units use an accurator or a TXV as
shown in Table 6.
Table 6 – Accurator Sizes
UnitSize
Cooling Only HeatPumps
40QAC 40Q AQ 38QRR
018 TVX 49 40
024 TVX 55 43
030 TVX 65 55
036 TVX 70 63
048 TVX 80 73
060 TVX TXV 80
NOTE: Pistons are supplied with either the indoor or outdoor units.
Power and Connecting Cables -- Field Supplied
Power:
S The main power is supplied to both the indoor and outdoor
units.
S Consult local building codes, NEC (National Electric Code) or
CEC (Canadian Electric Code) for any special requirements.
S Use Table 7 forthe electrical requirements for the outdoor units
and Table 8 for the indoor units to correctly sizethe cables and
disconnect switches.
Control Wiring
Thermostat wires should be used for control wiring between the
indoor and outdoor units. A two conductor cable is required for
the cooling only units and a seven conductor cable is required on
heat pumps. 18 AWG is recommended for any length up to 200 ft
(61.0 m).
User Interface -- Finished Goods Accessory
Any of the following three thermostats can be used depending on
the type of system on hand and the desired features. Refer to Table
9 to select the proper thermostat.
Table 7 – 38HDR / QRR Electrical Requirements
UNITSIZE V --- PH --- Hz
38HDR 38QRR
MIN CKT AMPS
FUSE/HACR BKR
AMPS
MIN CKT AMPS FUSE/HACR BKR AMPS
018 208/ 230---1---60 12.1 20 12.1 20
024 208/ 230---1---60 17.7 25 18.8 30
030 208/ 230---1---60 19.1 30 17.5 30
036
208/230---1---60 19.1 30 20.9 30
208/230---3---60 13.0 20 14.1 20
460---3 ---60 7.9 15 7.9 15
048
208/230---1---60 26.4 40 34.6 50
208/230---3---60 17.9 25 22.4 30
460---3 ---60 8.4 15 10.0 15
060
208/230---1---60 34.5 60 34.5 60
208/230---3---60 21.5 30 23.6 40
460---3 ---60 10.6 15 10.6 15
Table 8 – 40QAC / QAQ Electrical Requirements
UNIT
VOLTAGE
V --- Ph --- 60 Hz
40QAC 40QAQ
MCA MOCP MCA MOCP
024 208/230---1 0.63 15.0 9.29 15.0
036 208/230---1 1.60 15.0 17.70 20.0
048 208/230---1 2.00 15.0 23.80 25.0
060 208/230---1 3.30 15.0 28.70 30.0
Table 9 – Thermostat Selection
Model Number
System Type
Cooling Only &HP
53DFS250---SL
Cooling Only
53DFS250---FS
Cooling Only
53DFST2---NP
Features
7 Day Programmable
√ √
---
5+1+1 Day Programmable --- ---
√
Remote RoomSensor
√ √
Dry Contact Equipped
√ √
---
40QAC/38HDR -- 40QAQ/38QR
R