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Common Questions Page 8 of 10
21. How does the color of the roof affect performance?
The following factors give you an idea of how roof color affects heat. (See paragraph below)
Black 1.28
Dark Blue 1.21
Blue 1.14
Dark Brown 1.07
Brown 1.00
Red .86
Green .71
Dark Gray .71
Gray .57
W h i t e .57
Smooth White .36
If good conditions exist for the pool, then just about any color of roof may be acceptable with the
PCS1, Flowreversalª and the use of a blanket. This would be especially true on relatively small pools
(450 sq ft) and large roof areas. Grey, white, and smooth white may be marginal on a large pool with
an extremely small attic to draw from. The above factors can be interpreted as follows: The PCS1 will
perform nominally, or 1.00, with a Brown roof.
Other colors will increase or decrease relative performance, however, a large roof with a poor
color factor may out perform a smaller roof with a good color factor. Due to the solar radiation and BTU
availability. Larger numbers are better performers.
22. What are some environmental factors?
Outside blanketed pool & Flowreversalª 2.00
Outside blanketed pool 1.00
Screen & blanketed pool .80
Outside, blanketed & windy .67
Outside without blanket .42
Screen without blanket .33
Outside, without blanket & windy .29
Water table (multiply above factors by) .80
The above environmental factors show that the PCS1 will perform twice as good with
Flowreversalª and a blanket. The larger the number, the better the conditions of performance with
the PCS1.
The dealer or purchaser is responsible for determining whether the PCS1 is suited to a
particular installation and operating environment.
23 . Is there a simple test to determine if an attic will be good enough?
Yes, generally. On a 70
°
F sunny day, find out what the temperature is inside the attic at its
peak. Acceptable attics will be 100
°
F or higher. Take the test when the Sun is shining and between 1-4
pm in the day. Power ventilators must be turned off the day before.
Some natural air vents or wind driven turbines may have to be shut off also. This test assumes
that Flowreversalª and a blanket are used with the system and that the attic is equal to or greater