15
M
INI
-S
PACE
EC I
NSTALLATION
, O
PERATION
AND
M
AINTENANCE
M
ANUAL
2.8.3.3 Remote
Water
Detector
Each remote water detector will require wiring two conductors
to the control terminal board in the unit electric box. The
wire insulation must be rated at 600V. Refer to the electrical
drawing supplied with your unit for proper wire terminations.
2.8.4 Split
Systems
The following system interconnecting fi eld wiring sections
detail the number of conductors required for a typical system.
Additional control conductors may be required depending
on the options purchased with the equipment. Refer to the
supplied electrical schematic to determine the total number
of interconnecting conductors required for your system. It is
important to note that the control transformer(s) supplied with
the equipment have been sized and selected based upon the
expected loads for each system.
CAUTION
Do not connect any additional loads to the system
control transformers. Connecting additional loads
to the factory supplied control transformer(s) may
result in overloading the transformer(s).
NOTE
All wiring must be provided in accordance with local
and national electrical codes.
2.8.4.1 Glycol
Systems
Systems equipped with a glycol-cooled system/pump
package require fi eld wiring between the glycol unit and
pump package (see Figure 9). The installer must wire two
control conductors from the terminal board in the Mini-Space
EC electric box to the pump package electric box. Refer to
the electrical drawing supplied with your unit for the number
of fi eld wires needed and appropriate wire terminations for
your system.
2.8.4.2 Remote
Condenser
Systems equipped with a remote condenser require fi eld
wiring between the Mini-Space EC unit and the remote
condenser (see Figure 10). Refer to the electrical drawing
supplied with your unit and the wiring diagram supplied with
the condenser (typically located in the condenser electric
box). The installer must provide main power wiring to the main
power distribution block located in the remote condenser
control box. A separate equipment ground lug is provided
in the electric box for termination of the earth ground wire.
The installer must also wire control conductors from the
terminal board in the A/C unit to the control terminal board
in the remote condenser electric box. Refer to the electrical
drawing for the correct number of fi eld wires needed and for
the appropriate wire terminations for your specifi c unit.
2.9
System Charging Procedures
2.9.1 Water-Water/Glycol Cooled Systems
No fi eld refrigerant charging is required for fl uid cooled units.
Observe the following precautions when installing and fi lling
the water-water/glycol loop:
•
Clean the piping system before water or water/
glycol is allowed to fl ow through the system.
•
Mix glycol with water before it is added to the sys-
tem. Use only water/glycol solution with inhibitors
for corrosion protection.
•
Bleed all air from the piping system before fi lling
the water-water/glycol loop.
1. Open a vent valve at the 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.
2.9.2 Pump
If a pump is used, ensure the system is fi lled before turning the
pump on; if the pump is not self-priming, there must be pressure
on the suction inlet.
CAUTION
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 fl owing 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 housing.
2.9.3 Remote
Air-Cooled
Systems
Remote air-cooled systems are provided with a dry nitrogen
holding charge, which must be removed before piping and
charging the unit. Before charging, check the unit nameplate
to confi rm the type of refrigerant to use.
NOTE
Refrigerant charging must be performed by a qualifi ed
air conditioning technician.
Mini-Space EC systems use R410A refrigerant. Refrigerants
that are multi-component blends like R410A have component
parts with different volatilities that result in a change in
composition and saturation temperature as evaporation
and condensation occur. The composition of liquid R410A
refrigerant however, remains relatively constant.
