34
RTHD-SVX01L-EN
18, p. 34. See Table 7, p. 34 for types and quantities of
insulation required.
Notes:
• Liquid line filter, refrigerant charging valves,
water temperature sensors, drain and vent
connections when insulated must remain
accessible for service.
• Use only water-base latex paint on factory-
applied insulation. Failure to do so may result in
insulation shrinkage.
• Units in environments with higher humidity or
very low leaving water temperature may require
thicker insulation.
Figure 18. Typical RTHD insulation requirement
Table 7. Recommended insulation types
Location
Type Sq. Feet
Evaporator
3/4" wall 90
Compressor
3/4" wall 25
All components and piping on low side of
system (gas pump, return oil line, filter from
pump)
3/4" wall 160
Freeze Protection
For unit operation in a low temperature environment,
adequate protection measures must be taken against
freezing. Adjusted settings and recommended ethylene
glycol solution strengths are contained in below table as
follows:
Table 8. Freeze protection settings
Glycol
Percentage
(%)
Ethylene Glycol Propylene Glycol
Solution
Freeze
Point (°F)
Minimum
Recommended Low
Refrigerant Temp
Cutout (°F)
Minimum
Recommended
Leaving Water Temp
Cutout (°F)
Solution
Freeze
Point (°F)
Minimum
Recommended Low
Refrigerant Temp
Cutout (°F)
Minimum
Recommended
Leaving Water Temp
Cutout (°F)
0 32.0 28.6 35.0 32.0 28.6 35.0
2 31.0 27.6 34.0 31.0 27.6 34.0
4 29.7 26.3 32.7 29.9 26.5 32.9
5 29.0 25.6 32.0 29.3 25.9 32.3
6 28.3 24.9 31.3 28.7 25.3 31.7
8 26.9 23.5 29.9 27.6 24.2 30.6
10 25.5 22.1 28.5 26.4 23.0 29.4
12 23.9 20.5 26.9 25.1 21.7 28.1
14 22.3 18.9 25.3 23.8 20.4 26.8
15 21.5 18.1 24.5 23.1 19.7 26.1
16 20.6 17.2 23.6 22.4 19.0 25.4
Installation Mechanical
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