036-21521-001-A-0103
10
Unitary Products Group
CONDENSATE DRAIN PIPING
Horizontal Units - The 3/4 FPT drain connection on the
unit is NOT internally trapped. The cooling coil com-
partment and drain pan are under negative pressure
when the blower is running, therefore a P trap MUST
be used in the drain line.
It is recommended that a ¾ inch drain line be sloped
(¼ inch/foot) all the way to an open drain. Each unit
must be installed with its own individual trap, and have
the means to flush out the condensate line if neces-
sary. If it is not possible to reach an open drain by grav-
ity flow, a pump kit, which is available as an accessory,
can be mounted close to the unit.
Vertical Units - Each unit utilizes a flexible hose inside
the cabinet as a trapping loop. An external P-trap is not
necessary.
WATER REGULATING VALVE – INSTALLATION
The water regulating valve is to be installed in the
water outlet line, as close as possible to the unit cabi-
net (maximum 18 inches distance). The capillary tube
from the sensing bellows on the valve(s) must be con-
nected to the ¼ inch male flare connection, which is on
the refrigerant liquid line in the condenser compart-
ment. Connect the capillary tube flare nut directly to the
unit male flare fitting. When one is making this connec-
tion, it is normal for some refrigerant to escape as the
schrader valve core is being opened and the nut is
being tightened. Complete the tightening of the nut as
soon as possible to minimize the loss of refrigerant. Do
not over-tighten.
START-UP AND OPERATION
NOTE:
The services of a qualified Refrigeration Service
Mechanic should be employed in the start-up and
commissioning of these systems.
After completing the installation, and before energizing
the power supply to the unit, the following checks
should be made -
•
Verify that the electrical supply to the unit is of the
correct voltage, and rated for sufficient amperage
in accordance with the nameplate values.
•
Verify that the low voltage wiring between the unit
and the thermostat is correct.
•
Confirm that the water piping is complete and free
of leaks.
•
Check that the water flow rate is correct, and adjust
as necessary.
•
Confirm that the blower wheel rotates freely.
•
All service access panels are in place and properly
secured.
A room thermostat should be used to cycle the unit on
and off automatically as required to maintain the room
temperature at the set point of the thermostat. The air
TABLE 5: UNIT WATER PRESSURE DROP
UNIT MODEL
EWT
o
F
007
009
012
018
024
030
036
048
060
GPM
WPD
(psi)
GPM
WPD
(psi)
GPM
WPD
(psi)
GPM
WPD
(psi)
GPM
WPD
(psi)
GPM
WPD
(psi)
GPM
WPD
(psi)
GPM
WPD
(psi)
GPM
WPD
(psi)
50
1.0
0.8
1.35
1.4
1.8
2.1
2.75
2.3
3.5
3.3
4.5
3.6
5.5
2.9
7.5
3.9
9.0
3.6
1.5
2.0
2.25
3.5
3.0
5.3
4.50
5.7
6.0
8.0
7.5
9.0
9.0
7.0
12.0
9.6
15.0
8.8
60
1.0
0.7
1.35
1.4
1.8
2.0
2.75
2.2
3.5
3.2
4.5
3.5
5.5
2.8
7.5
3.7
9.0
3.5
1.5
1.9
2.25
3.4
3.0
5.1
4.50
5.5
6.0
7.7
7.5
8.7
9.0
6.8
12.0
9.2
15.0
8.5
70
1.0
0.7
1.35
1.3
1.8
1.9
2.75
2.1
3.5
3.0
4.5
3.3
5.5
2.6
7.5
3.5
9.0
3.3
1.5
1.8
2.25
3.2
3.0
4.8
4.50
5.2
6.0
7.3
7.5
8.2
9.0
6.4
12.0
8.7
15.0
8
85
1.0
0.7
1.35
1.2
1.8
1.8
2.75
2.0
3.5
2.9
4.5
3.1
5.5
2.5
7.5
3.3
9.0
3.1
1.5
1.7
2.25
3.0
3.0
4.6
4.50
4.9
6.0
6.9
7.5
7.8
9.0
6.1
12.0
8.3
15.0
7.6
100
1.0
0.6
1.35
1.2
1.8
1.7
2.75
1.9
3.5
2.7
4.5
3.0
5.5
2.4
7.5
3.2
9.0
3.0
1.5
1.6
2.25
2.9
3.0
4.4
4.50
4.7
6.0
6.6
7.5
7.5
9.0
5.8
12.0
7.9
15.0
7.3
Lock all electrical power supply switches in the off
position before installing the unit. failure to discon-
nect power supply may result in electrical shock or
even death.
