Carrier 69NT40-541-001 Operation And Service page 23

2.3.22 Upper Air (Fresh Air Make Up)
The unit may be fitted with an upper fresh air makeup assembly. The fresh air makeup assembly is available with a
Vent Positioning Sensor (VPS) and may also be fitted with screens.
2.3.23 Lower Air (Fresh Air Make Up)
The unit may be fitted with a lower fresh air makeup assembly. The fresh air makeup assembly is available with a
Vent Positioning Sensor (VPS) and may also be fitted with screens.
2.3.24 Arctic Mode
To improve operation in cold ambients, the unit may be fitted with a crankcase heater. The crankcase heater is
operated, before start-up, to warm the compressor oil and boil off any liquid refrigerant that may be present in the
crankcase.
2.3.25 Power Correction
The unit may be fitted with a set of power factor correction capacitors to assist in correction of imbalance in current
draw by the compressor.
2.3.26 Evaporator
Evaporator section is equipped with a hermetic thermal expansion valve and a heat exchanger. The unit may have
6 heaters.
2.3.27 Evaporator Fan Operation
Two evaporator fan motor operation systems are available. On units with Normal Evaporator Fan Operation, open-
ing of an evaporator fan internal protector will shut down the unit. On units equipped with Single Evaporator Fan
Capability, additional relays are installed to allow the unit to continue to operate on a single fan.
2.3.28 Labels
Operating Instruction and Function Code listing labels will differ depending on the options installed. For example,
additional operating instructions are required to describe start-up of a unit equipped with an autotransformer.
Where the labels are available with additional languages, they are listed in the parts list.
2.3.29 Plate Set
Each unit is equipped with a tethered set of wiring schematic and wiring diagram plates. The plate sets are ordered
using a seven digit base part number and a two digit dash number.
2.3.30 Controller
Two different controllers are available:
1. Remanufactured - Controller is the equivalent of a new OEM controller and is supplied with a 12 month warranty.
2. Repaired - Controller has had previous faults repaired and upgraded with the latest software.
Repaired controllers are NOT to be used for warranty repairs. Only full OEM Remanufactured
controllers are to be used.
Controllers will be factory equipped with the latest version of operational software, but will NOT be configured for a
specific model number and will need to be configured, at the time of installation or sale.
2.3.31 Condenser Grille
Two styles of condenser grilles are available, direct bolted grilles and hinged grilles.
2–3 T-316