Installation, Operation and Maintenance Manual
Page
22
of
100
3.5.2
Connection Sizes, Water/Glycol Cooled Units
CEILING MOUNTED UNITS
Model Number
Water In
Water Out
GPAX-2.5
3/4” O.D.
3/4” O.D.
GPAX-03
3/4” O.D.
3/4” O.D.
GPAX-04
1-
1/8” O.D.
1-
1/8” O.D.
GPAX-05
1-
1/8” O.D.
1-
1/8” O.D.
GPAX-06
1-
5/8” O.D.
1-
5/8” O.D.
GPAX-08
1-
5/8” O.D.
1-
5/8” O.D.
GPAX-10
1-
5/8” O.D.
1-
5/8” O.D.
GPAX-13
1-
5/8” O.D.
1-
5/8” O.D.
FLOOR MOUNTED UNITS
Model Number
Water In
Water Out
GPAU-05
1-
1/8” O.D.
1-
1/8” O.D.
GPAU-08
1-
5/8” O.D.
1-
5/8” O.D.
GPAU-10
1-
5/8” O.D.
1-
5/8” O.D.
GPAU-13
1-
5/8” O.D.
1-
5/8” O.D.
CO
2
Piping
For units with CO
2
control, there is a 3/8” copper line connection to be used with an external CO
2
source. This
external CO
2
supply is to be regulated to 50 PSIG is as the maximum allowable supply pressure prior to entering the
unit. Higher pressures could result in valve malfunction or failure.
The CO
2
option includes a solenoid valve and CO
2
sensor. For CO
2
control logic, see dap4 IOM addendum section.
Condensate Drain Piping
To properly drain the condensate from the evaporator condensate pan, the evaporator section is equipped with a
3/4” FPT connection on the bottom of the unit for
condensate removal. The following are recommendation for
condensate drain systems:
1.
Do not reduce the size of the condensate drain piping.
2.
The condensate drain piping must be run to an unrestricted waste line and must be protected from freezing.
3.
In high humidity conditions it is recommended to insulate the condensate drain line to prevent
condensation forming on the exterior of the piping.
4.
It is recommended that a union (field supplied) be installed at the ¾” FPT
connection to permit easy
disassembly of the condensate drain piping from the unit for cleaning.
5.
Drain lines should be pitched downward not less than 1/4” for each ten (10) fe
et of horizontal run.
6.
Where local codes permit, PVC pipe may be used.
7.
Ceiling units with an optional vertical discharge have a 5” plenum below the
evaporator drain pan. The
plenum has knockouts that allow routing of the field supplied and installed condensate drain piping system.
The drain line can be routed out either side of these units.
