User Guide

HEAT CONTROLLER, INC. WATER-SOURCE HEAT PUMPS
Residential Split - 60Hz R410A
Rev.: 03 August, 2012
Heat Controller, Inc. Water-Source Heating and Cooling Systems30
Unit Start-Up and Operating Conditions
Unit and System Checkout
BEFORE POWERING SYSTEM, please check the following:
UNIT CHECKOUT
 Shutoff valves: Insure that all isolation valves are open.
 Line voltage and wiring: Verify that voltage is within an
acceptable range for the unit and wiring and fuses/breakers
are properly sized. Verify that low voltage wiring is complete.
 Unit control transformer: Insure that transformer has the
properly selected voltage tap. Residential 208-230V units are
factory wired for 230V operation unless specifi ed otherwise.
 Loop/water piping is complete and purged of air. Water/piping
is clean.
 Antifreeze has been added if necessary.
 Entering water and air: Insure that entering water and air
temperatures are within operating limits of Tables 9a and 9b.
 Low water temperature cutout: Verify that low water
temperature cut-out on the DXM2 control is properly set.
 Unit fan: Manually rotate fan to verify free rotation and insure
that blower wheel is secured to the motor shaft. Be sure to
remove any shipping supports if needed. DO NOT oil motors
upon start-up. Fan motors are pre-oiled at the factory. Check
unit fan speed selection and compare to design requirements.
 Condensate line: Verify that condensate trap is installed and
pitched.
 HWG pump is disconnected unless piping is completed and
air has been purged from the system.
 Water fl ow balancing: Record inlet and outlet water
temperatures for each heat pump upon startup. This check
can eliminate nuisance trip outs and high velocity water fl ow
that could erode heat exchangers.
 Unit air coil and fi lters: Insure that fi lter is clean and
accessible. Clean air coil of all manufacturing oils.
 Unit controls: Verify that DXM2 fi eld selection options are
properly set. Low voltage wiring is complete.
 Blower CFM and Water ∆T is set on communicating
thermostats or diagnostic tool.
 Service/access panels are in place.
SYSTEM CHECKOUT
 System water temperature: Check water temperature for
proper range and also verify heating and cooling set points for
proper operation.
 System pH: Check and adjust water pH if necessary to
maintain a level between 6 and 8.5. Proper pH promotes
longevity of hoses and fi ttings (see Table 4).
 System fl ushing: Verify that all air is purged from the system.
Air in the system can cause poor operation or system
corrosion. Water used in the system must be potable quality
initially and clean of dirt, piping slag, and strong chemical
cleaning agents. Some antifreeze solutions may require
distilled water.
 Internal Flow Controller: Verify that it is purged of air and in
operating condition.
 System controls: Verify that system controls function and
operate in the proper sequence.
 Low water temperature cutout: Verify that low water
temperature cut-out controls are set properly
(LT1 - JW3).
 Miscellaneous: Note any questionable aspects of
the installation.
 CAUTION! 
 CAUTION! 
CAUTION! To avoid equipment damage, DO NOT
leave system fi lled in a building without heat during the
winter unless antifreeze is added to the water loop. Heat
exchangers never fully drain by themselves and will freeze
unless winterized with antifreeze.
CAUTION! Verify that ALL water valves are open and
allow water fl ow prior to engaging the compressor.
Freezing of the coax or water lines can permanently
damage the heat pump.
Unit Start-up Procedure
1. Turn the thermostat fan position to “ON.” Blower
should start.
2. Balance air fl ow at registers.
3. Adjust all valves to their full open position. Turn on the line
power to all heat pump units.
4. Room temperature should be within the minimum-maximum
ranges of Table 9b. During start-up checks, loop water
temperature entering the heat pump should be between
30°F [-1°C] and 95°F [35°C].
5. It is recommended that water-to-air units be fi rst started
in the cooling mode, when possible. This will allow liquid
refrigerant to fl ow through the fi lter-drier before entering the
TXV, allowing the fi lter-drier to catch any debris that might
be in the system before it reaches the TXV.
6. Two factors determine the operating limits of geothermal
heat pumps, (a) return air temperature, and (b) water
temperature. When any one of these factors is at a minimum
or maximum level, the other factor must be at normal level to
insure proper unit operation.
6. Two factors determine the operating limits of geothermal
heat pumps, (a) return air temperature, and (b) entering
water temperature. When either of the factors is at a
minimum or maximum level, the other factor must be at
normal levels to insure proper unit operation.
a. Place the unit in Manual Operation. When in manual
mode activate Y1,Y2, and O to initiate the cooling mode.
Also manually increase CFM until desired cooling CFM
is achieved. Next adjust pump speed % until desired
loop temperature difference (leaving water temperature
minus entering water temperature) is achieved. (For
modulating valve adjust valve %).
INSTALLER SETTINGS
THERMOSTAT CONFIG
SYSTEM CONFIG
ACCESSORY CONFIG
INPUT DEALER INFO
HUMIDITY CONFIG
TEMPERATURE ALGORITHM
DEMAND REDUCTION CNFG
SERVICE MODE
RESTORY DEFAULTS
ATC32U01
SELECT OPTION
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