Grundfos Control HVAC, Инструкция по установке и эксплуатации

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1. Go to Menu > Tuning > Bypass valve gains .
2. Enter the Gain and Integral time .
If you want a faster reaction, increase the gain and reduce the
integral time. If you want a slower reaction, reduce the gain and
increase the integral time.
5.2 Testing the product
5.2.1 Testing the connections
All chillers, pumps and air-handling zones must be switched off.
All pump selector switches on the main cabinet must be set to
Off .
The system selector switch must be set to Manual/Local .
You can use the indicator light on the terminal to test that a device
has been connected properly to it.
1.
Digital inputs: Switch each device on and off, one at a time,
and use the indicator light on the terminal to check that the
device has been properly connected to it.
The indicator light is lit when the connected device is turned on.
As you must not start the pumps at this point, you cannot check
the analog signal from the VFD. You can do this when you start
the pumps for the first time.
2. Analog inputs: Use the indicator light on the terminal to check
that the feedback from each analog device is rational.
The indicator light indicates whether the signal is within or out
of range.
Related information
13.3 I/O modules and terminals. See page 18.
5.2.2 Testing the bypass valve
The controller must be unlocked.
1.
Set the operating mode of the bypass valve to manual:
a. Go to
Zone bank > Zone bank status .
b. Set the valve operating mode to Manual .
c. Set the position of the bypass valve by dragging the pointer
on the scale.
The value indicated on the scale is in percentage of the
maximum opening.
2. Check that the bypass valve changes its position according to
the setting. You may have to remove the cover of the bypass
valve.
3. Bypass valves with position feedback enabled: Check the
feedback by checking that the actual opening value shown on
the scale corresponds to the position previously set.
5.2.3 Testing the pumps
1. If there is a bypass valve in the system, set its opening to 100
% to make sure that the water can circulate in the system.
2. Set all pump selector switches to Off
3. Open the isolating valve of one chiller. Do not start the chillers.
The controller prevents the pumps from starting if the isolating
valves of all chillers are closed.
4. Set the first pump selector switch to Manual .
5. Set the pump speed to approximately 20% of the maximum
speed:
a. Go to
Pump bank > Pump bank status .
b. Select the pump.
c. Set the speed on the scale.
The speed indicated on the scale is in percentage of the
maximum speed.
6. Check that the first pump starts and runs at the selected speed.
Depending on the product, you can read the pump speed in
different ways.
Pump type Where to read the speed
External VFD See the product manual
7. Go to Pump bank status and check that the measured speed
displayed on the pump icon is correct.
8. Set the pump selector switch to Off to switch off the pump.
9. Follow steps 4 to 8 to test the other pumps, one at a time.
Make sure to set each pump selector switch to
Off after testing
the pump and before testing the next one.
Related information
9.4 Setting the position of the bypass valve manually. See
page 14.
5.2.4 Testing the pump cascade
1. Check that the operating mode of each pump is set to Auto .
2. Open the isolating valve of one chiller. Do not start the chiller.
Check that at least one pump is starting.
3. Open the other isolating valves one at a time and check that
the pump bank reacts normally. Pumps must cut in and/or
increase in speed.
Related information
7.7 Pump cascade control. See page 12.
5.2.5 Testing the overall system
The pump cascade must have been tested and the pump operating
mode must be set to
Auto .
1. Open some of the isolating valves of the chillers, for example
half of them. Do not start the chillers.
2. Set the operating mode of the bypass valve to Auto :
a. Go to Zone bank > Zone bank status .
b. Set the operating mode to Auto .
3. Change the cooling load, for example by turning on and off
some air-handling zones or fan coils. Check that the system
reacts correctly:
a. Check that the value of the sensors is rational.
b. Check that the pumps cut-in and cut-out according to the
demand.
c. Check that the bypass valve opens when necessary.
4. Turn on all air-handling zones.
5. Switch on the chillers one at a time and check that the system
reacts correctly.
The system is now ready to start.
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English (US)