Water-To-Water Unit Controller | 25Greensource CDi Series TW Model
8733954853 (2020/04)Greensource CDi Series TW Model
Subject to change without prior notice
LED Indicators
Table 6 LED Indicators
User Adjustable Settings Chart
Table 7 User Adjustable Settings Chart
Setting Up The Controller
On unit power up the LED display will show the
software version, temperature differential setting
with the ability for the user to change it for ten
seconds then will display “OFF” and then finally
will display the control temperature of the fluid
being measured (entering fluid, leaving fluid, tank,
etc.) The default setting of the differential is 1
° F
and can be adjusted from 1–10
° F at start up. The
differential setting is the differential between
set-point temperature and actual on/off
temperature of the machine.
For example:
Cooling set point = 45
° F
Differential = 1
° F
The heat pump will cycle on in cooling at 46
° F. If
it is a two-stage machine, stage 2 will come on at
48
° F or 2° F degrees above set point and one
degree differential. The unit will shut off at set
point.
Heating set point = 120
° F
Differential = 1
° F
Stage 1 will come on at 119
° F and stage 2 will
come at 117
° F. Both stages will remain running
until set point is achieved. Stage 1 and stage 2 will
cycle on and off according to the lead/lag
programmed interval.
Whenever there is a demand for heating or cooling
and during the first stage of operation the
temperature is not changing, then the control will
activate the second stage after a three-minute
delay from the first-stage activation. This logic will
apply when the control is powered up, on a power
interruption, when the mode function is set to OFF
and then back to either HEAT or COOL and when
switching from heating to cooling or vice versa in
the auto changeover mode.
Heating and cooling set points are adjusted by
selecting each mode on the key pad and then using
the up-down arrows to select the set point. Thus,
push cool mode button and use down arrow to
45
°F. Push heat mode button and use up arrow to
120
°F. The controller can be set to control heating
only, cooling only, or auto change modes. The
mode button is pushed until the circular LED is lit
next to the chosen control mode.
LED Color Indication
HEAT
Red Indicates that the control is
in the HEATING mode
COOL
Green
Indicates that the control
is in the COOLING mode
AUTO
Yellow
Indicates that the control
is in the AUTO mode
COM
Red Indicates that pump(s) are
selected for continuous
operation
CYC
Red Indicates that pump(s) are
selected for cycling
operation
SERVICE
Red Red LED will turn steady on
or blink to indicate that a
pressure switch has opened
Settings Range Default
TEMP SETTING
40–120° F
Heating and
Cooling
DIFFERENTIAL
1–10° F 1° F
MODE
Heat, Cool, Auto,
Off
Off
TEMP SCALE
° F, ° C F
PUMP MODE
Con (continuous),
Cyc (cycle)
Con
DEAD BAND
1–6° F 3° F
AUTO CHANGE
OVER
55–85° F 65° F
TEST MODE
De (delay) or Nd
(No delay)
De
COMPRESSOR
Si (Single), DU
(Dual)
Si
MALFUNCTION
St (Steady), Pu
(Pulsing)
St
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