Service manual

CLIMATEMASTER WATER-SOURCE HEAT PUMPS
Vertical Stack
Rev.: 11/09/12
18
ClimateMaster Water-Source Heat Pumps
Flow Regulation - Flow regulation can be accomplished
by two methods. One method of fl ow regulation involves
simply adjusting the ball valve or water control valve
on the discharge line. Measure the pressure drop
through the unit heat exchanger, and determine fl ow
rate from. Since the pressure is constantly varying, two
pressure gauges may be needed. Adjust the valve until
the desired fl ow of 1.5 to 2 gpm per ton [2.0 to 2.6 l/m
per kW] is achieved. A second method of fl ow control
requires a fl ow control device mounted on the outlet of
the water control valve. The device is typically a brass
fi tting with an orifi ce of rubber or plastic material that is
designed to allow a specifi ed fl ow rate. On occasion, fl ow
control devices may produce velocity noise that can be
reduced by applying some back pressure from the ball
valve located on the discharge line. Slightly closing the
valve will spread the pressure drop over both devices,
lessening the velocity noise. Note: When EWT is
below 50°F [10°C], 2 gpm per ton (2.6 l/m per kW) is
required.
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.
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.