Qnergy PowerGen 5650 Series, Installation & Operation Manual

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21.1.4 Setting Temperature Setpoint
The temperature set point can be modified remotely by Modbus (see “Modbus” on page 98) or
by the Lynx application. See Figure 21-3 on page 169 for how to access the setpoints in Lynx.
The “Max Supply Limit” will control the supply temperature. Set this temperature to the highest
temperature the user wants the heat trace to reach. The “Return Target” controls the return
temperature. Set this temperature to the lowest temperature the user wants the heat trace to
reach.
21.1.5 Coolant Drain Procedure
The GHT pump can be used to aid the draining of the entire heat trace loop. Follow the steps
below to drain the entire system:
1. Enable the PowerGen if not already running
2. Toggle the GHT switch to the “OFF” position (found on the front panel LUI).
3. Prepare a catch pan or bucket to catch the coolant.
4. Disconnect the “supply” line from the PowerGen and place the catch pan under the supply
port.
5. Ensure all valves in loop are open (except for drain valves).
6. Toggle the GHT to the “ON” position.
7. Adjust the pump speed on the VFD as needed until liquid stops flowing from the supply port.
8. Once liquid has stopped flowing, toggle the GHT switch to the “OFF” position.
9. Collect the remaining coolant in the reservoir.
10.If the Y strainer is located at the supply port, we recommend relocating it to the return port.
11. If the Y strainer is located at the return port, locate the catch pan under it, open the strainer
to release all the remaining media from the reservoir. Clean the strainer and replace.