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UNITROL MODEL 8400, 8401, 8406, 8450, 8451, 8456
ALL PIPES FROM THE CHILLER AND RETURNING TO THE
CHILLER MUST BE INSULATED. COMMERCIAL SNAP-ON
FOAM INSULATION IS SUFFICIENT FOR THIS PURPOSE.
REASON #1: DURING WARM WEATHER THE INSULATION
WILL PREVENT CONDENSATION FROM THE PIPES.
REASON #2: EVERY SQUARE INCH OF ALL PIPES IN THE
SYSTEM WILL ACT AS AN EXCHANGE SURFACE FOR THE
CHILLER. IN OTHER WORDS, THE CHILLER WILL TRY TO AIR
CONDITION THE FACTORY. THE ENERGY USED IN THIS WAY
IS WASTED AND MIGHT LOWER THE ENERGY ABILITY OF
THE CHILLER TO A POINT LOWER THAN THAT REQUIRED
FOR THE MACHINE LOADS.
CHILLER MODEL
8400, 8401, 8406
8450, 8451, 8456
Check the plumbing hookup diagram on page 21:
1. MAKEUP WATER: Install a water line to the AUTO REFILL MAKEUP WATER port on
module 2. A 3/8" pipe or hose is sufficient for this purpose. This will be used to keep the
internal water tank filled if there are any leaks in the outside water system. A float valve is
provided in the water tank.
Because this same pipe that feeds this makeup water line will be used to circulate water to
the machinery if the chiller is taken out of service, the pipe size should be at least 1". Install a
INSTALLATION
PLUMBING
PIPE INSULATION
PIPE SIZING CHART
MINIMUM HEADER SIZE
2"
3"
6
MINIMUM DOWN
RUNS
¾"
¾"
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