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electric box. Refer to the electrical drawing supplied with
your unit for proper wire terminations.
Important:
Do not allow the cable water detector to
contact metal (frame or condensate pan). It
must be mounted on the plastic stand-offs
provided with the water detector.
Remote Temperature Sensor (A-Tech)
The remote temperature sensor requires a three-
conductor shielded cable with the shield terminated at the
thermostat. Both the thermostat and the sensor are
provided with a terminal strip with box type lugs for wire
connections. Refer to the electrical drawing supplied for
proper wire terminations.
Remote Temperature/Humidity Sensor
The remote temperature/humidity sensor requires a
shielded cable with the shield terminated at the unit
electric box. The number of conductors needed depends
on which system controller is used. Three control
conductors are required for systems using an E² controller.
Both the electric box and the sensor include a terminal
strip with box type lugs for wire connections. Refer to the
electrical drawing supplied with your unit for the number
of conductors required and for the appropriate wire
terminations.
Note: All wiring must be provided in accordance with
National Electrical Code and local code
requirements for Class 2 circuits.
System Charging Procedures
Water/Glycol Systems
All self-contained water/glycol cooled units (units that
require no refrigerant field piping) are factory charged
with refrigerant. No field refrigerant charging is required.
The following precautions must be observed when
installing and filling the water/glycol loop:
•
The piping system must be cleaned prior to adding
water/glycol to the system.
•
Glycol must be mixed with water before it is added to
the system. All air must be bled from the piping
system. Use only water/glycol solution with inhibitors
for corrosion protection.
1. Open the vent valve at highest point of the system.
2. Fill the system until the solution is discharging from
the vent with minimal signs of foaming due to air in the
system.
Pump
If a pump is used, ensure the system is filled before turning
the pump on. If the pump is not self-priming, it is important
that there is pressure at the suction inlet.
AH-SVX008C-EN
NOTICE
Pump Damage!
Do not run the pump when dry.
If the pump has no pressure on the discharge side, leave
the discharge valve partially shut to create a back pressure
in the pump so that liquid can build up in the impeller
housing to keep the impeller housing from getting too hot.
Make sure there is always liquid flowing through the pump
to cool the impeller and housing. If there is no liquid
leaving the pump, shut the pump off immediately to
prevent damage to the pump. Check for proper rotation of
the motor, observing the arrow on the side of the impeller.
DX Unit Charging Requirements
When performing the specific DX charging procedures in
this section, follow these best practices:
•
Ensure that contamination of different refrigerants
does not occur when using charging equipment. Hoses
or lines must be as short as possible to minimize the
amount of refrigerant contained in them.
•
Keep cylinders upright.
•
Ensure the refrigeration system is grounded to Earth
before charging the system with refrigerant.
•
Label the system when charging is complete (if it is not
labeled already).
•
Excerise extreme care to avoid overfilling the
refrigeration system.
Before recharging the system, it must be pressure tested
with oxygen-free nitrogen (OFN). The system must be leak
tested upon completion of charging but prior to
commissioning. A follow-up leak test must be carried out
prior to leaving the site.
Remote Air-Cooled Systems (AR/AHU)
Remote air-cooled units are provided with a dry nitrogen
holding charge which must be removed before piping and
charging the unit.
Important:
POE oil is used in systems with R407C
refrigerant. POE oil quickly absorbs
moisture when exposed to air. High POE oil
moisture levels react with refrigerant to
form acid which results in system
contamination.
NOTICE
Equipment Damage!
This is POE oil, which readily absorbs moisture. Always
use new oil and never leave containers open to the
atmosphere while not in use.
Note: Refrigerant charging must be performed by a
qualified air conditioning technician.
Installation
27
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