Daikin VHF - Operating Limits; Antifreeze Correction Factors

systeM aPPliCations
www.DaikinApplied.com 23 Vertical Stack WSHP • IM 986-11
Environment
This equipment is designed for indoor installation only. Shel-
tered locations such as attics, garages, etc., generally will not
provide sufcient protection against extremes in temperature
and/or humidity, and equipment performance, reliability, and
service life may be adversely affected.
CAUTION
Units must be checked for water leaks upon initial
water system start-up. Water leaks may be a result of
mishandling or damage during shipping. Failure by the
installing contractor to check for leaks upon start-up of the
water system could result in property damage.
Operating Limits
Table 10: Air limits in °F (°C)
Air Limits
Standard Range Units Geothermal Range Units
Cooling (DB/WB) Heating Cooling (DB/WB) Heating
Minimum Ambient Air
1
50°F/40°F (10°C/4°C) 50°F (10°C) 40°F/30°F (4°C/-1°C) 40°F (4°C)
Maximum Ambient Air
2
100°F/85°F (38°C/29°C) 85°F (29°C) 100°F/85°F (38°C/29°C) 85°F (29°C)
Minimum Entering Air
1
65°F/55°F (18°C/13°C) 50°F (10°C) 65°F/55°F (18°C/13°C) 50°F (10°C)
Common Design Entering Air 75°F/63°F (24°C/17°C) 70°F (21°C) 75°F/63°F (24°C/17°C) 70°F (21°C)
Maximum Entering Air
2
85°F/71°F (29°C/22°C) 80°F (27°C) 85°F/71°F (29°C/22°C) 80°F (27°C)
Minimum CFM/Ton 300
Maximum CFM/Ton 450
Table 11: Fluid limits
Fluid Limits
Standard Range Units Geothermal Range Units
Cooling Heating Cooling Heating
Minimum Entering Fluid 55°F (13°C) 55°F (13°C) 30°F (-1°C) 20°F (-6°C)
Common Design Entering Fluid 85-90°F (29-32°C) 70°F (21°C) 90°F (32°C) 35-60°F (1.5-16°C)
Maximum Entering Fluid 120°F (49°C) 90°F (32°C) 120°F (49°C) 90°F (32°C)
Minimum GPM/Ton 1.5
Nominal GPM/Ton 3.0
Maximum GPM/Ton 4.0
Notes: 1. Maximum and minimum values may not be combined.If one value is at maximum or minimum, the other two conditions may not exceed
the normal condition for standard units. Geothermal range units may combine any two maximum conditions, but not more than two, with
all other conditions being normal conditions.
2. This is not a normal or continuous operating condition. It is assumed that such a start-up is for the purpose of bringing the building space
up to occupancy temperature.
Antifreeze Correction Factors
Antifreeze % by weight
15% 25% 35% 45%
Ethanol
Cooling Capacity
0.985 – – –
Heating Capacity 0.9825 – – –
Pressure Drop
1.04
Ethylene Glycol
Cooling Capacity
0.9935 0.9895 0.985 0.981
Heating Capacity 0.9865 0.9795 0.973 0.965
Pressure Drop
1.10 1.16 1.22 1.27
Methanol
Cooling Capacity
0.985 – – –
Heating Capacity 0.9825 – – –
Pressure Drop
1.04 – – –
Propylene Glycol
Cooling Capacity
0.985 0.975 0.965 0.955
Heating Capacity 0.981 0.9685 0.952 0.936
Pressure Drop
1.11 1.20 1.31 1.40