Orion RKS250F-S Operation Manual page 12

Preparation
■Checking the Water Level.
Confirm there is water in the water tank.
Add water to the water tank. The amount of water should be at least the amount of water shown in the
following chart.
Required water tank
volume (L)
IMPORTANT
● If the amount of water is lacking, it could result in a high on / off cycling of the compressor,
which could result in damage to the compressor.
● Consult with a qualified specialist if the water tank capacity is too low or regarding
construction of an automatic water supply.
■ Priming the Pump
1. Confirm that there is no dirt or other material clogging
the strainer assembly on the water intake side of the
water piping.
2. Wet the pump-priming port gasket with water
beforehand to make it slippery.
3. Slowly add water from the pump-priming port until the
water intake piping and pump are filled.
4. After filling, be sure to hand-tighten the pump-priming
port cap.
IMPORTANT
● Failure to prime the pump will cause the pump to run dry, preventing water from being chilled,
and it will also result in damage to the pump.
● Because of the strainer assembly, priming the pump is not required other than when the
product is operated the first time. However, the pump will need to be primed again, as was
done initially, after the water has been drained, after the pipes have been cleaned or air
entering the water circuit.
● Priming water only needs to be added so that the water intake piping and pump are filled. Be
careful not to add water too vigorously or all at once. Doing so can cause a siphon effect to
occur, causing the water to be drawn out of the water outlet port, and preventing the water
from collecting where it is needed for priming.
● Do not loosen the priming water cap while the product is operating. Loosening the cap could
allow air to enter the pump, resulting breakdown due to running dry.
Operating Procedures
Preparation
RKS250F-S
10
RKS400F-S RKS500F
20 25
9
RKS750F
35
Pump-priming
port cap
Pump-priming
port gasket
Pump-priming
port