Coolerado M50C - Step 12: Control Board Set-up and Operation

Coolerado Installation
Page 18 of 63
5. Winter/Summer; winter mode when contact
closed. Allows fan to run without water
pressure. It initiates Freeze Protection relay,
this turns off the main water line, (if connected
to a solenoid valves), opens the water drain
line, and opens up the unit water solenoid valve
for 5 minutes. Closed contact or Winter mode
takes precedence over Winter/Summer Switch
on the Water Control Board. White light comes
on.
6. 24 VAC
7. Freeze protection relay.
8. Common
Control Terminal, Figure 30
If using the recommended variable control thermostat model
TEC3620:
Unit Control
Thermostat TEC3620
Color
Y-24 VAC IN
FAN
Yellow
RC-24 VAC OUT
24V
Red
Variable Fan
CGL
Blue
COM
COM
Black
Thermostat Connections, Table 2
Step 12 – Control Board Set-up and Operation
Note: Do not start unit till Step 15.
CONTROL BOARD 8 DIP SWITCHES
1. Initiates the Wet Out cycle after a power failure
with two possible settings, OFF over one hour,
ON over four hours.
2. Low and High water quantity, OFF plus 25%, ON
plus 50% over the calculated evaporation rate.
3. Model Number, in conjunction with 4; factory
setting.
4. Model Number
5. Elevation, in conjunction with 6.
6. Elevation
7. Auto Variable Fan, OFF 10 vdc, ON from AIN
8. Freeze Protection, OFF no freeze protection, ON
freeze protection, (requires connection to
solenoid valves by others).
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 if 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
temporary shutdown to prevent breakage of valves or line.
Freezing will not harm HMX.
Dip switch
1
Power Failure Rewet; OFF less than 1 Hour, ON
2
Water Quality, OFF good, ON poor
3
Model Number, Factory Set
4
Model Number, Factory Set
Elevation
0
2000’ (610M)
4000’
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 2, 3, 4 and 5 for more information.
There are five (5) LED’s on the control board to indicate: