Orion-system Two Condenser Head Pressure Module Manual de usuario descargar pdf (Pagina 15)

Technical Guide

Two Condenser Head Pressure Module

Troubleshooting

Head Pressure Module Valve/Fan

Position Troubleshooting

If conﬁ gured for Water valve:

Aout Signal is 2 to 10 volts.

2 volts = 0% valve position or fully closed

10 volts = 100% valve position or fully open

PWM signal is not used for water valve but does modulate.

At Startup for cooling, valve will open to 75% or 8 volts for 3

minutes then will modulate every 30 seconds to try to maintain

head pressure setpoint.

For heating, valve will open and stay at 100%.

If conﬁ gured for Air Condenser Fan:

Aout Signal is 0 to 10 volts.

Minimum fan speed is 1.5 volts. ( 15%)

Maximum fan speed is 10 volts. ( 100%)

Anything less than 1.5 volts the fan will be off.

PWM signal is 0 to 100%

PWM+ (to ground) will always read 24 vdc.

PWM- (to ground) can be measured for volts dc and this

formula will tell you the percentage signal: (24 – measured

value)/24 (measured value = PWM- to ground)

PWM-

0 volts = 100% fan speed

6 volts = 75% fan speed

12 volts = 50% fan speed

18 volts = 25% fan speed

20.4 volts = 15% fan speed

Above 20.4 volts = 0% fan speed

At Startup for cooling, fan will start at 50% then will

modulate every 30 seconds to try to maintain head pressure

setpoint.

For heating, fan will run and stay at 100%.

Safeties:

If head pressure signal is above 500 psig, fan will go to 100%

(high pressure safety).

If head pressure signal is below 1 psig, fan will go to 100%

(assuming bad sensor).

Revised 11/5/13

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Orion-system Two Condenser Head Pressure Module Manual de usuario Pagina 15