Coolerado C60A, Installation Manual

Page: 19 / 53

Coolerado Installation
Page
19
of 53
If using a single stage thermostat:
Unit Control Thermostat Color
RC 24VAC Red
C 24COM Black
Y 1st Stage Cooling Yellow
To get the most benefit from the high efficiency motor in the
M30, M50, and C60 systems, a modulating variable fan speed
controller thermostat is used.
See Appendix 3
If using the recommended variable control thermostat model
TEC2145-4:
Unit Control Thermostat Color
RC 24VAC Red
C 24COM Black
Y FAN (COOLING) Yellow
AIN AO1 (0 to 10V) Blue
Step 12 – Control Board Set-up and Operation
Note: Do not start unit till Step 15.
CONTROL BOARD DIP SWITCHES
There is a block of eight (8) dip switches located on the
control board. The first four (4) determine how much water is
delivered to the unit.
Switches 1-4 are pre-set at the factory as indicated in Table 3
(or see Appendix 5 ).
Switches 5 and 6 should be set to geographic elevation
conditions to ensure that water is used as efficiently as
possible.
If a variable speed thermostat is used, set control dip switch
setting 7 to the “on” position. This will vary the water flow
based on the amount of air flow. If dip switch 7 is set in the
off position, 10 VAC will be delivered to the fan motor control
wiring and it will run full speed whenever cooling is called for.
Dip switch setting 8 controls weather freeze protection is on
or off, see appendix 8 for additional installation details.
Freeze protection allows the unit to be automatically pulled
out of service during a cold spell but keep the unit ready for
cooling. It should not be used for end of season shut down
when cooling is no longer needed for an extended period of
time. In some locations cooling is required all year round but
still may experience temperatures below 32
o
F and require
shut down. There are cooling situations such as small data
centers where the water is turned off for winter operation
and only the fan is used to cool with outdoor air and the
freeze protection should be turn off. In this case the low
water pressure switch must be bypassed for the winter.
Caution: If dipswitch 8 is turned off the water control
program will not make any changes due to weather and
therefore must be manually winterized.
Dip switch
1 On (Preset at factory – do not change)
2 On (Preset at factory – do not change)
3 Off (Preset at factory – do not change)
4 Off (Preset at factory – do not change)
Elevation
0 2000’ (610M) 4000’ (1220M) 6000’ (1830M)
5 Off On Off On
6 Off Off On On
7
On for Variable Speed Fan, 0 to 10 VDC
OFF = Single Speed Fan Setting (10 VAC)
8 On Freeze Protection mode see Appendix 8
Table 3: Control Board Dip Switch Settings
Control Operation
See Appendix 3 or more information.
There are four (4) LED’s on the control board to indicate:

Control box power is on: the White LED is on

Regulating Solenoid valve is open (powered): the
Red LED marked “W” (for Water) is on

Thermostat is calling for cooling: the red LED marked
“C” (for Cool Call) is on

Flush cycle is on: the red LED marked “F” (for Flush)
is on
The water control board has a fan speed potentiometer
mounted on it. This is a single turn pot that controls the
maximum voltage going to the fan. If dip switch 7 is in the off
position the fan voltage can be turned between 0 and 10
VDC. If dip switch 7 is on then this pot will proportionally vary
the voltage received at the water control board allowing a
maximum fan speed to be set. The factor setting is full speed.
Step 13 – Thermostat
Note: Do not start unit till Step 15.