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EGW06-PCPEG-20140813
TM
TM
Section IV: Installation
COLD SURFACE TEMPERATURE SENSOR (2)
This sensor is used to measure the temperature of the coldest surface in the pool enclosure. The sensor is an aluminum
bar 1” long by ¼” square with a clearance hole for a number 8 screw and two 6” wires on one end.
When the temperature of the surface drops to within 5 F of the space air dew point the humidity set point will be
automatically reset downward to help prevent condensation on the cold surface. It should be noted that resetting the
humidity set point will not compensate for lower quality building materials such as single pane glass or non-thermally
broken frames.
The sensor should be mounted on an exterior window or door frame that is not in direct sunlight. In cases where there are
no exterior windows or doors, the sensor should be mounted on the inside surface of an exterior wall. The sensor must be
in contact with the cold surface. Electrical connection should be made with 22 AWG, copper, two-conductor, shielded,
twisted-pair cable. Connect the shield drain wire to ground at the PoolComPak™ unit end only.
ECONOMIZER SYSTEM (OPTIONAL) (3)
An economizer system cools the space with outside air instead of the compressor. The ECC-PCP provides a dry contact
closure to activate the economizer. The contacts of the ECC-PCP may be connected directly to the economizer control
circuit provided the circuit is 24 VAC maximum and the current does not exceed 1 amp inductive. The other components
of the system must be provided by others. (See figure below for an illustration of a typical economizer system.)
The economizer will operate only when space cooling is required and there is no dehumidification requirement. When
the outside air temperature is greater than 50°F and more than 5°F below the space temperature set point and the space
temperature rises above the set point, the compressor is disabled and a dry contact closure between T2.16 and T2.17 is
made to activate the economizer.
When the ECC-PCP contacts close relay R1 is energized causing the outside and exhaust air dampers (by others) to open
and the return air damper (by others) to close. At the same time relay R2 is energized causing the exhaust fan to run.
If the space temperature continues to rise and exceeds the space temperature set point by more than two degrees, the
economizer contact is opened, reversing the damper positions. The compressor is energized in the space cooling mode
(if so equipped). The compressor will then continue to run until the call for space cooling is satisfied. The economizer
will also be activated in the space cooling mode if the auxiliary air conditioning condenser option is not installed or if the
compressor is locked out by a fault condition.
Figure 4-4. Economizer Operation
PCP_EG_EconomizerOperation2_20121204.eps
