Installation, Operation and Maintenance Manual
Page
13
of
100
placing a momentary jumper across low voltage terminals which will energize the control circuit. Check the wiring
diagram for the terminal numbers to jumper across. This will energize the control circuit.
If an optional remote heat exchanger (DARC) (air cooled or dry coolers) is ordered it can be either single or three-
phase, but the individual Permanent-Split Capacitor PSC fan motors are single phase and will only run in one
direction. Check the operation of the fans by placing a momentary jumper across the low voltage field terminals.
Check the wiring diagram for the terminal numbers to jumper across. This will energize the control circuit.
NOTICE
Disconnect pumps on glycol systems unless already filled with
water/glycol solution.
The remote heat exchanger fans may not run because the evaporator section has not reached the required cut-in
head pressure for air-cooled units or the thermostat set-point is above the current ambient or water temperature.
Please see the Air-Cooled Condenser or Fluid Cooler User Manuals for more detailed information regarding the
remote heat exchangers.
3
Piping
Piping design should comply with required codes, law and regulations that apply at the site of the installation.
Examples:
Mechanical Refrigeration Code CSA B52
Building Code
Plumbing Code
ASHRAE 15
Municipal / City/ State / Provincial Codes / National/ International
Refrigerant Piping
NOTICE
The American refrigeration industry uses different copper pipe called
ACR (air conditioning and refrigeration field services) pipe, which is sized
directly by its outside diameter (OD) and a type letter indicating wall thickness.
ACR pipe is manufactured without processing oils that would be incompatible
with the oils used to lubricate the compressors in the HVAC system.
•
All refrigerant piping should be Air Conditioning Refrigeration (ACR) hard drawn copper tube, unless
otherwise specified. Soft copper tubing is unacceptable.
•
Copper tubing intended for air conditioning refrigeration applications must be dehydrated, charged with
nitrogen, and plugged by the manufacturer.
•
The nominal size is based on the outside diameter (OD).
•
All refrigerant piping should be installed with high temperature brazed joints. When brazing refrigerant
lines, an inert gas should be passed through the line at low pressure to prevent scaling and oxidation
inside the tubing. Dry nitrogen is preferred. No soldering allowed. Refer to ANSI/AWS standards A5.8,
A5.31, B2.2 and or C3.4 for brazing guidance and reference.
