Service manual

19
THE SMART SOLUTION FOR ENERGY EFFICIENCY
Consoles
Rev.: 5 Nov., 2009B
climatemaster.com
Water Coil Low Temperature Limit Setting
For all open loop systems the 30°F [-1.1°C] FP1 setting
(factory setting-water) should be used to avoid freeze
damage to the unit. See “Low Water Temperature Cutout
Selection” in this manual for details on the low limit
setting.
Ground-Loop Heat Pump Applications
 CAUTION! 
CAUTION! Many units installed with a factory or fi eld
supplied manual or electric shut-off valve. DAMAGE WILL
OCCUR if shut-off valve is closed during unit operation. A
high pressure switch must be installed on the heat pump side
of any fi eld provided shut-off valves and connected to the
heat pump controls in series with the built-in refrigerant circuit
high pressure switch to disable compressor operation if water
pressure exceeds pressure switch setting. The fi eld installed
high pressure switch shall have a cut-out pressure of 235
psig and a cut-in pressure of 190 psig. This pressure switch
can be ordered from ClimateMaster with a 1/4” internal fl are
connection as part number 39B0005N01.
NOTICE! Ground-water applications for commercial
buildings with more than 2-3 units should include a plate
frame heat-exchanger to isolate the heat pumps from the
ground-water and confi ne heat exchanger cleanings to one
location and lessen maintenance. Direct use of ground-water
may increase the frequency of heat pump maintenance and
may shorten life expectancy.