Table of Contents
Advertisement
12.2 High Voltage Disconnect Switch
Install a separate disconnect switch at the outdoor unit.
For high voltage connections, flexible electrical conduit is recommended whenever vibration transmission may
create a noise problem within the structure.
12.3 High Voltage Ground
Ground the outdoor unit per national, state, and local code requirements.
Section 13. Start Up
13.1 System Start Up
STEP 1 - Ensure Sections 7 through 12 have been completed.
STEP 2 - Set System Thermostat to OFF.
STEP 3 - Turn on disconnect(s) to apply power to the indoor and outdoor units.
STEP 4 - Wait one (1) hour before starting the unit if compressor crankcase heater accessory is used and the
Outdoor Ambient is below 70ºF.
STEP 5 - Set system thermostat to ON.
Section 14. System Charge Adjustment
14.1 Temperature Measurements (Systems can be rated with TXV, EEV or Piston. Ensure charging method
is correct).
Important: Installer must mark/write the total refrigerant charge on the OD unit label after adjusting for indoor
coil and lineset. Technicians must have their refrigerant cylinder on a scale during the charging procedure and
measure how much additional refrigerant is put in the system (additional over the factory charge). The additional
charge must be recorded on the label provided on the outdoor unit as well as the resulting total system charge.
Important: Standard service trucks and vans may not carry more than six 25# cylinders (< 220 lb of A2L refriger-
ant total)
Important: A2L approved equipment required for leak detection, charge and recovery.
Important: Ensure that contamination of different refrigerants does not occur when using charging equipment.
Important: A set of calibrated weighing scales shall be available and in good working order. Hoses shall be com-
plete with leak-free disconnect couplings and in good condition. Ensure any associated electrical components
are sealed.
STEP 1 - Check the outdoor temperatures.
Subcooling (in cooling mode) is the only recommended* method of charging above 55º F ambient outdoor
temperature.
Note: For Superheat (In Cooling Mode), refer to the Superheat Charging Table on pg 18.
*Weigh-In Method can be used for initial installation, or system replacement when power is not available or
when the desired temperatures for the standard charging method are outside normal bounds. See Section
14.3.
For best results the indoor temperature should be kept between 70º F to 80º F.
Note: It is important to return in the spring or summer to accurately charge the system in the cooling mode
when outdoor ambient temperature is above 55º F.
12
18-AC128D1-1B-EN
Advertisement
Table of Contents
