2 Maintenance
Test low water flow conditions
NOTICE | This test is to be carried out once the | |
SYNC boiler is completely piped in | ||
| ||
| with adequate gas and water flow. | |
| Once the test is completed, ensure | |
| that the isolation valve is opened up to | |
| allow full water flow. |
Test procedure
1.Set the SYNC to operate with the demand configuration parameter set to 1 (Cascade Set Point Thermostat- Based).
NOTE: This can be accomplished by selecting the demand configuration parameter in the Service/Setup Menu. See Section 1 of this manual for complete details of the SmartTouch controls.
2.Set the system setpoint to the max user setpoint. Max user setpoint will allow the boiler to operate without reaching this setpoint. The boiler will require a load large enough to dissipate a large portion of the heat it is generating.
3.Simulate a call for heat by placing a jumper wire across the enable contacts on the low voltage terminal strip located at the rear of the unit (FIG.
4.Allow the unit to progress through its normal diagnostics and
5.Allow the unit to fire and operate until the temperatures stabilize. This occurs when the inlet and outlet
temperatures are rising together and the Delta T ( T) is maintained.
6.When the unit stabilizes, begin to slowly shut off the isolation valve on the outlet piping of the boiler (see FIG.
7.While slowly shutting off the isolation valve, refer to the Burner Screen to watch the behavior of the boiler. On this screen, you will witness each individual control module modulating its’ respective burner’s firing rate
| while reacting to the rising | T. | |
8. | When the | T reaches | 50˚F for an individual heat |
| exchanger, the control for the heat exchanger will | ||
| attempt to modulate the firing rate down to protect it | ||
| from low flow conditions. |
| |
9. | When the | T reaches | 60˚F for an individual heat |
exchanger, the control module for the heat exchanger will turn off the respective burner.
NOTE: The Temperature Menu will show the inlet and outlet temperatures for each individual heat exchanger.
Service Manual
10.Restrict the isolation valve until both control modules have shut down. If both control modules have been shut down, the test was successful.
11.Disconnect the jumper wire from the low voltage terminal strip connected in step 3.
12.If necessary, reset the demand configuration in the Service/ Setup Menu to the required operational mode.
NOTE: See Section 1 of this manual for complete details of the SmartTouch controls.
13.Completely open the isolation valve on the outlet piping of the boiler.
14.Resume operation.
NOTE: This lockout is a soft lockout. Once the T has decreased to an acceptable level and there is a call for heat, the unit will fire again to meet the demand.
Figure
LOW VOLTAGE CONNECTION BOARD
| 1 | ALARM |
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| 2 | CONTACTS |
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| 3 | RUN TIME |
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| 4 | CONTACTS |
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| 5 | LOUVER |
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| 6 | PROVING |
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| 7 MODULE 2 |
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| 8 | FLOW SWITCH | ||
| 9 MODULE 1 |
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| 10 FLOW SWITCH | |||
| 11 TANK |
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ENABLE | 12 THERMOSTAT |
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13 R ENABLE |
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CONTACTS | 14 W |
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| LBL20052 REV B | ||
| 15 SHIELD GND | MOD | ||
| 16 A |
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| 17 B |
| BUS | |
| 18 SHIELD GND | |||
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| 19 | (+) | 0 - 10V INPUT | |
| 20 | |||
| 21 SYSTEM |
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| 22 SENSOR |
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| 23 OUT DOOR |
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| 24 SENSOR |
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| 25 TANK |
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| 26 SENSOR |
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| 27 SHIELD GND | CASCADE | ||
| 28 B |
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| 29 A |
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| 30 SHIELD GND |
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ADJUST OUTLET
ISOLATION VALVE
ONLY
41