Edwards TCU 40/80 - Page 32

7.3 Filling the reservoir
Warning When retrofitting a TCU 40/80 in place of a
water/glycol unit, the coolant lines must be flushed
with nitrogen to remove moisture prior to
installation.
1. Open the vent port valve (see Figure 8 on page 18) to avoid air locks that may slow filling.
2. Remove the plug and fasten the funnel accessory to the Vi" fill port located at the rear of the unit (see
Figure 8 on page 18).
3. Fill the reservoir with Fluorinert heat transfer fluid. The amount needed for a new installation is
approximately 44 pounds for the TCU and an additional amount for process lines (approx. .15 lbs/ft.;
1/2" tube) and other external volumes. Fill the reservoir until the Coolant Normal Level LED on the
rear electrical panel turns green.
4. In the event of over-filling, the Coolant Normal LED will change from green to amber. Drain excess
fluid until the Coolant Normal Level LED turns green. Refer to Draining/Bleeding the Coolant
Reservoir, below.
7.4 Draining/bleeding the coolant reservoir
It may be necessary to drain the coolant reservoir for storage of the TCU 40/80 or due to moisture
contamination of the coolant. v
It may be necessary to bleed the coolant reservoir to correct an overfill condition.
Note: The unit may continue running during this procedure.
Follow the procedure below whenever it becomes necessary to drain or bleed the system.
Firtreme Temnerature Hot or cold coolant may reach "40 °C t0 +80 °C during
UXtreme 1 emperature operation. Hot or cold fluid can cause burns.
Coolant should be at ambient temperature before
handling.
1. Open the vent valve located at the top of the unit.
2. Place an appropriate container beneath the drain valve. The capacity of the container used needs to be
10 liters plus the volume of the hoses and the volume of the process equipment.
3. Remove the cap fitting from the end of the drain valve.
4. Open the reservoir drain valve.
5a. To correct an overfill condition, drain the reservoir until the Coolant Level Normal LED on the rear
electrical panel turns green. Close the reservoir drain and vent valves when the LED turns green.
5b. To empty the reservoir, remove power to the TCU and allow the unit to drain until all coolant has
been removed.
6. Close the reservoir drain and vent valves.
7. For proper disposal of the coolant, follow the manufacturers recommendations.
Note: Uncontaminated Fluorinert may be reused. The Fluorinert should be stored in a compatible and
sealed container.
26 TCU 40/80 Temperature Control Unit