25
FORM CIM 0203
OPTIONS
CONDENSATE PUMP
If extreme condensate conditions exist, it is pos-
sible to have a condensate pump installed in the
evaporator drain pan without need for separate
power source (See Item , Figure 6, page 6 - Ex-
ternal Flare Connection). Raise the tubing to the
highest possible point above the pump (maximum
12 feet). A 4 ft. rise delivers 50GPH; a 10 ft. rise
delivers 15 GPH. Form an inverted “U” trap as
shown in Figure 22 below. This helps to prevent
backward siphoning, which causes excessive pump
cycling. If this configuration is not possible, the in-
stallation of a check valve (Hartell Model
VCV-4) is recommended.
Operation of the condensate pump is automatic.
Water is collected in the drain pan. When the inter-
nal float raises to a pre-set point, the pump will be
activated. As the condensate level goes down, the
float turns off the pump at another preset point.
NOTE: In case of algae formation, use a com-
mercially available algaecide. After use of the
algaecide, rinse with water. Repeat as neces-
sary. Be careful not to clog the check valve
or tubing when starting the pump.
CAUTION: Flexible tubing (1/4" I.D.)
should be supported to prevent kinking and
possible pump damage.
THERMOSTAT
Standard units (no heating) with one compressor re-
quire single stage thermostats, cool only. Units with
two or three compressors require dual stage thermo-
stats, cool only.
When a programmable thermostat is used, a sixth con-
tact must be added to the terminal board in the evapo-
rator section. Three connections must be made from
this sixth contact . . . to the programmable thermo-
stat, to a ground and to the 24 volt coil of the
evaporator fan motor contactor (K2). See Figure 23.
Heat pump units and units with auxiliary electric heat
(either integral in unit or in duct) require single stage,
cool/heat heat pump thermostats if units have only
one compressor. Units with two or three compres-
sors require dual stage heat pump thermostats with
cool/heat functions.
CHECKING HOT GAS BYPASS
VALVE
1.
Connect a calibrated thermocouple lead to the
outlet line at the hot gas bypass valve. Tie wrap
and insulate the lead.
2.
Connect a low pressure refrigerant gauge to
the suction line.
3.
Connect a high pressure refrigerant gauge to
the liquid line.
4.
Operate air conditioner in the cooling mode
until system is stabilized. (Approximately 15
Figure 22:
Condensate Pump and Trap Installation
INVERTED "U" TRAP
12' MAX.
TO
DRAIN
0010CA
K2
Evaporator Fan
24 Volt Coil
New Sixth
Contact To Be Added
Terminal
Board
Ground
Programmable Thermostat
Evaporator
Section
Enclosure
3
1
2
R
G
Y
Y
T
C
1
2
Fig 23:
Adding Sixth Contact
0004CA
Summary of Contents for 4CA1901
Page 2: ...2 FORM CIM 0203 ...
