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8.8 Start-Up Testing
8.8.1 Preparation
NOTE: A wall control (MSWCH; 243-7002) is optional. For operation and installation details, please refer
to manual 950-0210 and 950-0220 respectively.
1. Double check that all wiring has been properly connected.
2. Check that tubing has been properly connected and unsure the suction and liquid side
service valves are fully open.
3. Review remote control functions in the operation manual.
8.8.2 Operational Test
NOTE: The cooling test can only be performed if the outdoor temperature is between 14°F and 118 °F.
The heating test can only be performed if the outdoor temperature is between 5°F and 81°F.
Unit may require several minutes to confirm the set point temperature and system functions
“COOL” Operation
NOTE: The indoor fan will not turn off in cooling mode when the set temperature is satisfied.
1. Ensure there is power going to the system. Turn on all indoor units and set to “COOL”
mode. Change the set temperature to 61°F for all indoor units
2. Press the “FAN” button to select high fan speed on all units.
3. The compressor should turn on no later than three (3) minutes (compressor delay)
afterwards. After operating for five (5) minutes after the compressor started, check for
cool air flow. Outlet temperature should be 20-24°F lower than ambient temperature.
(If outlet temperature is out of range, contact technical support).
“HEAT” Operation
NOTE: The indoor fan will turn off in heating mode shortly after the set temperature is satisfied.
1. Ensure there is power going to the system. Turn on all indoor units and set to “HEAT”
mode. Change the set temperature to 86°F for all indoor units
2. Press the “FAN” button to select high fan speed on all units.
3. The compressor should turn on no later than five (5) minutes (compressor delay)
afterwards. After operating for several minutes after the compressor started, verify the
unit is blowing warm air.
8.8.3 Other Operations
Test the emergency operation button for proper operation. (see operation manual).
It is recommended that all other function be tested for operation. Please refer to the operation
manual to verify that the unit operates properly. Also, review the remote control functions with
the owner. If unit does not perform as described, please see the troubleshooting section.
8.8.3 Temperature Differential
NOTE: This feature is only available for the wall mounted units.
Follow the following steps to set the temperature differential:
1. Change the temperature on the remote from °F to °C by pressing the “mode” and “– “
button simultaneously.
2. Within thirty (30) seconds of bringing power to
the system, set the indoor unit to HEAT mode.
Change the setpoint to 17-20°C depending on the
desired setting (see table on right for details).
Alternate between pressing “+” and “-“ (change
temperature to original setting three (3) times
within five (5) seconds). The indoor unit will
display the differential (1-3°C) briefly and the
heating and operation lights will flash three times.
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