12
M
INI
-S
PACE
EC I
NSTALLATION
, O
PERATION
AND
M
AINTENANCE
M
ANUAL
Consult the Copeland applications data guide for detailed
information regarding refrigerant line traps and line sizing.
2.7.2 Water/Glycol, Chilled Water and Hot
Water Reheat Piping
The piping connections for water/glycol and chilled
water systems are sweat connections. Pipe sizes may not
necessarily be the same size as the unit connection. Piping
should be sized to match the required system pressure drop
and pump capacity (if applicable) and may require reducing
fi ttings to match the connection size on the air conditioner.
Water/glycol/chilled water-cooled systems with low
entering fl uid temperatures should have insulated piping.
The recommended ethylene glycol solution ratio is 40%
glycol to 60% water. (STULZ recommends Dowtherm SR1
manufactured by Dow Chemical Co.) Use only ethylene glycol
with inhibitors for corrosion protection.
WARNING
Glycol is hazardous. Consult the manufacturer’s SDS
for detailed safety information.
CAUTION
When installing and fi lling the water/glycol/chilled
water loop and optional hot water reheat loop, all air
must be bled from the piping system.
CAUTION
The piping system must be fl ushed prior to operating
the system. Failure to do so will result in equipment
problems.
A strainer should be included in the water/glycol/chilled water
line. Once the system is operational, the fl uid runs through the
strainer where any foreign objects are removed. The strainer
screen should be cleaned periodically.
2.7.3 Pump
Package
Install a concentric reducer at the pump suction and discharge
openings and make all piping at least one (1) size larger than
the diameter of the openings. If a suction strainer is necessary,
install one with a net area 2
–
3 times larger than the suction
piping. The piping leaving the drycooler should enter the
pump suction port. Install a check valve in the discharge line
to prevent back fl ow that may damage the pump on shut
down. Install a ball valve in the suction and discharge lines
for maintenance purposes.
2.7.4 Condensate Drain Line
2.7.4.1 Gravity
Drain
A drain line is installed to drain the condensate pan. If an
optional humidifi er is used, the drain line from the humidifi er is
typically connected to the condensate drain line. The drain line
is run out of the right side of the cabinet. See the installation
drawing provided with your unit for the size and location of
the condensate drain line.
NOTE
The humidifi er drains (hot) water into the condensate
drain line during normal operation. As an option,
a separate drain line may be provided for the
humidifi er.
The drain line must not be exposed to freezing temperatures.
The diameter of the drain line should be the full size of the
connection.
NOTE
Pour some water into the condensate drain pan(s)
prior to start-up. This fi lls the trap and prevents air
from being drawn up the drain lines.
2.7.4.2 Condensate
Pump
An optional condensate pump shown in Figure 7 on page
13 is available for automatic removal of condensate from
the air conditioner and fl ush water from the humidifi er. The
condensate pump must be fi eld installed.
A P-trap is installed in the condensate pan drain line, so one is
not required for the condensate pump. The condensate pump
discharge line should be 1/2 inch OD (maximum) copper
pipe to prevent excessive backfl ow to the condensate pump.
2.7.5 Humidifi er
Mini-Space EC systems use an electrode steam humidifi er. In
most cases the humidifi er empties into the condensate drain
line during the fl ush/drain cycle. As an option, the drain for
the humidifi er may have a separate connection. Refer to the
installation drawing provided with your unit for the size and
location of the connection.
Table 3.
Recommended Discharge Line Sizes
Recommended Discharge Line Sizes
(For R410A Refrigerant)
CC() Model
No./Total
BTU Capacity
Equivalent Length Ft*
50’ or less
100’ or less
150’ or less
041 / 12,000
1/2
1/2
5/8
061 / 18,000
5/8
5/8
5/8
081 / 24,000
5/8
7/8
7/8
121 / 36,000
7/8
7/8
7/8
