Specifications
2
Table 2B — Minimum Outdoor-Air Operating
Temperature — 09DK (SI)
LEGEND
*Interpolation permitted.
†Additional FCPS required for 66%/33%.
NOTES:
1. Fans on the 09DK020-094 units are controlled by ATSs and
FCPSs.
2. Minimum outdoor temperatures are determined for indoor and
outdoor unit combinations of the same capacity.
Table 3 shows the ambient temperature at which 30GTN,
GTR,GUN,GUR, 38AH and 38AKS units operate without
modification.
Table 3 — Minimum Outdoor-Air Operating
Temperature — 30GTN,GTR,GUN,GUR and
38AH,AKS
*Data based on standard units operating at 100% of system capac-
ity. Temperatures shown are for circuit A or B, whichever is higher.
To operate these units below the ambient temperatures list-
ed, Motormaster® V controls (Fig. 1) must be added. Field-
supplied and installed wind baffles are also required for all
units. The Motormaster V control permits operation of the unit
to an ambient temperature of –20 F (–29 C). The control
regulates the speed of 3-phase fan motors that are compatible
with the control. These motors are factory installed on 60 Hz
models, but must be field installed on 50 Hz models.
See Tables 4 and 5 for the Motormaster V control accessory
package usage and contents. Table 6 shows applicable voltages
and motors. Motor or fan blade replacement is not necessary on
most units since the control is compatible with the factory-
installed fan motors. Only field wiring control is required.
NOTE: Two Motormaster V controls must be added for each
unit (one for each circuit) with the following exceptions:
• 30GTN,GTR,GUN,GUR230-420 modular units require
4 controls (2 per modular unit)
• 38AH124,134 modular units require 4 controls (two per
modular unit)
• 38AH024-034, 38AKS028-044 and 09DK020-044
require only one controller per unit
• 09DK020-044 also requires a field-supplied, 20 x 20 x 8
NEMA 3R enclosure.
Pre-Installation — Inspect the contents of this accessory
package before installing. File a claim with the shipper if you
find shipping damage or if a part is missing.
Table 4 — Motormaster V Control
Package Usage
*Two accessory packages required for modular units.
UNIT
09DK
HEAD
PRESSURE
CONTROL
TD
(C)
COMPRESSOR CAPACITY (%)*
100 75 50 25
Minimum Outdoor-Air
Temperature (C)
020,024,
028
FCPSs (1 Fan)†
16.7 –2 1 3 11
13.9 3 4 6 12
11.1 8 8 8 13
034,044 FCPSs (2 Fans)†
16.7 –11 –7 –6 6
13.9 –6 –4 –2 8
11.1 –1 –1 2 11
054,064 FCPSs (2 Fans)†
16.7 –2 1 3 11
13.9 3 4 6 12
11.1 8 8 8 13
074-094
FCPSs (2 Fans)†
ATSs (2 Fans)
16.7 –11 –7 –6 6
13.9 –6 –4 –2 8
11.1 –1 –1 2 11
ATS — Air Temperature Switch
FCPS — Fan Cycling Pressure Switch
TD — Temperature Difference (Saturated Condensing
Temperature – Entering-Air Temperature)
UNIT/SIZE
TEMPERATURE
FC
30GTN,GTR,GUN,GUR040-210 0 –18.0
30GTN,GTR,GUN,GUR Modules 230-420 0 –18.0
38AKS
028 31 –0.6
034 30 –1.1
044 25 –3.9
38AH
024 53 11.7
028 50 10.0
034 49 9.4
38AH*
044 50 10.0
054 48 8.0
064 39 3.9
074 31 –0.5
084 20 –6.7
094 25 –3.9
104 14 –10.0
124 38 3.3
134 38 3.3
To avoid the possibility of electrical shock, open all discon-
nects before installing or servicing this accessory.
UNIT SIZE VOLTAGE PACKAGE NO.
30GTN,GTR,
GUN,GUR
040-110
208/230 30GT-911---080
380, 400, 460 30GT-911---081
575 30GT-911---082
130-210,
230A-315A
208/230 30GT-911---074
380, 400, 460 30GT-911---075
575 30GT-911---076
230B-315B
208/230 30GT-911---080
380, 400, 460 30GT-911---081
575 30GT-911---082
330A/B-420A/B*
208/230 30GT-911---074
380, 400, 460 30GT-911---075
575 30GT-911---076
38AH
024-034
208/230 30GT-911---077
380, 400, 460 30GT-911---078
575 30GT-911---079
044-134
208/230 30GT-911---080
380, 400, 460 30GT-911---081
575 30GT-911---082
38AKS 028-044
208/230 30GT-911---077
380, 400, 460 30GT-911---078
575 30GT-911---079
09DK
020-044
208/230 30GT-911---077
380, 400, 460 30GT-911---078
575 30GT-911---079
054-094
208/230 30GT-911---080
380, 400, 460 30GT-911---081
575 30GT-911---082