Trane TR250 Service & Installation Manual page 25

If the normal pump and fi lter system fl ow rate exceeds 125 gpm then a manual bypass valve must be in-
stalled as shown in Figure 12. Damage caused by fl ow rates outside this range will void the manufacturer's
warranty.
The installation is as follows:
1. Install a fl ow meter on the outlet line of the heater.
2. Adjust the manual bypass valve until the fl ow
rate is within the fl ow rate range specifi ed for the
heater.
3. Once the valve is set, note the position and remove
the valve handle to prevent further adjustment.
ATTENTION: Improperly adjusted manual bypass valves will result in damage to the heater if the
fl ow rates are not maintained as specifi ed in Table 14 under all operating conditions. The heat exchang-
er will fail and this damage will not be covered under warranty.
Figure 12: Manual Bypass valve
Heater Inlet
Heater Outlet
Flow Meter
Return to
Pool / Spa
Bypass Valve
Table 14: Allowable Water Flow Rate Range
Minimum Flow
Model
Rate (GPM)
TR250 25
TR400 30
25
Maximum Flow
Rate (GPM)
125
125