Partial Heat Recovery Freeze Protection; Partial Heat Recovery Pressure Drop Curves - Trane CGAM Installation & Operation Manual

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
•
OR
•

Partial Heat Recovery Pressure Drop Curves

Figure 53. Partial heat recovery pressure drop curve — 60 Hz
8
7
6
5
4
3
2
1
0
0
66
methods:
Install heat tape on all field-installed water piping.
Add freeze inhibit fluid to the partial heat recovery water loop.
PHR Water PD Curve (60Hz)
52/60
35
40
26/30
20
20 40
PHR Water Flow Rate (gpm)
90/100/110 120/130
80
70
60 80 100
CG-SVX17D-EN