66 CG-SVX17D-EN
Installation - Mechanical
Partial Heat Recovery Freeze Protection
The heat recovery condenser is insulated and a factory-installed heater is installed and will protect
the heat exchanger from freezing in ambient temperatures down to -20°F
(-29°C).
When the ambient temperature drops to approximately 39°F (3.9°C) the thermostat energizes the
heaters.
Note: The inlet and outlet piping should be protected against freezing by one of the following
methods:
• Install heat tape on all field-installed water piping.
OR
• Add freeze inhibit fluid to the partial heat recovery water loop.
Partial Heat Recovery Pressure Drop Curves
Figure 53. Partial heat recovery pressure drop curve — 60 Hz
PHR Water Pressure Drop (psid)
PHR Water Flow Rate (gpm)
PHR Water PD Curve (60Hz)
20
26/30
35
40
52/60
70
80
90/100/110
120/130
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