66
REYQ-TATJA / TAYDA
EDUS371704C-D
19. Low Ambient Cooling Enhancement
REYQ72-456TATJA / TAYDA
REYQ-T series include a feature for Low Ambient Cooling.
The function enhances REYQ-T series as follows:
• Allows operation to −4ºFDB (−20ºCDB) ambient temperature in cooling mode. (Normal limit is 23ºFDB (−5ºCDB).)
• Operation below 23ºFDB (−5ºCDB) requires the addition of wind covers onto the outdoor unit.*
60 70 80
Indoor temperature (˚FWB)
110
100
90
COOLING
Ambient temperature (˚FDB)
Range for continuous operation
Range for pull-down operation
20
10
0
-10
80
70
60
50
40
30
Application Rules:
• Total connection index of each system is limited to 50-130% when height difference is 0-194 ft. (0-50 m), 80-130% when 194-295 ft. (50-90 m).
• All units on the system must be connected to a Branch Selector Box, Low ambient cooling is only available on indoor unit connected to a single
branch selector box. Single and Multi-port Branch Selector Boxes may be combined on one system but all indoor units connected to a multi branch
selector box will operate as standard without the low ambient cooling function.
• Function is engaged by a field setting on the outdoor unit (to enable Low Ambient Cooling) and a dip switch setting is necessary on the Single
Branch Selector Boxes BSQ-T series serving the indoor units NOT subject to Low Ambient Cooling requirements.
• During operation below 23ºFDB (−5ºCDB), the available cooling capacity decreases as follows:
14ºFDB (−10ºCDB) - Reduces to 80% of nominal.
5ºFDB (−15ºCDB) - Reduces to 65% of nominal.
–4ºFDB (−20ºCDB) - Reduces to 60% of nominal. (Only applicable to Single-port Branch Selector Boxes)
• The operating sound level of the Single Branch Selector Boxes BSQ-T series could increase 3 dB(A) higher than maximum while the systems is
operating in the Low Ambient Cooling mode. It is recommended to locate units away from zones sensitive to sound levels.
• Allowable height difference between outdoor and indoor units (when outdoor unit is below) is limited to 130 ft. (40 m).
(Normal limit is 195 ft. (60 m).)
* Contact your local Daikin representative for wind cover specification requirements and part numbers.
Summary of Contents for VRV IV REYQ72TATJA
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Page 34: ...32 REYQ TATJA TAYDA EDUS371704C D 10 Dimensions REYQ72TATJA TAYDA 3D090838C...
Page 41: ...39 REYQ TATJA TAYDA EDUS371704C D 12 Center of Gravity REYQ72TATJA 4D090825A...
Page 42: ...40 REYQ TATJA TAYDA EDUS371704C D REYQ96 120TATJA 4D090826A...
Page 43: ...41 REYQ TATJA TAYDA EDUS371704C D REYQ144 168TATJA 4D090827A...
Page 44: ...42 REYQ TATJA TAYDA EDUS371704C D REYQ72TAYDA 4D090828A...
Page 45: ...43 REYQ TATJA TAYDA EDUS371704C D REYQ96 120TAYDA 4D090829A...
Page 46: ...44 REYQ TATJA TAYDA EDUS371704C D REYQ144 168TAYDA 4D090830A...
Page 48: ...46 REYQ TATJA TAYDA EDUS371704C D 14 Piping Diagrams REYQ72TATJA TAYDA 3D091128B...
Page 49: ...47 REYQ TATJA TAYDA EDUS371704C D REYQ96 168TATJA TAYDA 3D091127B...
Page 67: ...65 REYQ TATJA TAYDA EDUS371704C D 18 Operation Limits REYQ72 456TATJA TAYDA 3D091329A...
Page 69: ...67 REYQ TATJA TAYDA EDUS371704C D 20 Sound Levels Reference Data REYQ72TATJA TAYDA C 4D093380A...
Page 70: ...68 REYQ TATJA TAYDA EDUS371704C D REYQ96 120TATJA TAYDA C 4D093379A...
Page 71: ...69 REYQ TATJA TAYDA EDUS371704C D REYQ144 168TATJA TAYDA C 4D093378A...
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Page 81: ...79 REYQ TATJA TAYDA EDUS371704C D Collective Indications Label 3P385986 1A...
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Page 83: ...81 REYQ TATJA TAYDA EDUS371704C D 23 2 REYQ96 168TATJA TAYDA Operation Name Plate 3P385983 1B...
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