Burnham RTC (Return Temperature Control) Manuale di Installazione Pagina 5
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MIX TARGET
When used as a mixing reset control, the MIX TARGET temperature is calculated from the reset ratio and outdoor air temperature.
When used as a setpoint control, the installer sets the MIX TARGET temperature. The control displays the temperature that it is
currently trying to maintain as the mix supply temperature. If the control does not have a heat demand,”– – –” is displayed as the
MIX TARGET.
BOILER RECIRCULATING PUMP
The boiler recirculating pump contact (Boil Pmp, terminal 5) closes whenever there is a registered heat demand and the control is
not in warm weather shut down (WWSD). The boiler recirculating pump segment is displayed in the LCD. When the heat demand
is satisfied, the control continues to operate the boiler recirculating pump for the purge time. The diverting valve remains open
at the current setting during the purge time and will modulate to protect the boiler. Once the purge time has expired, the boiler
recirculating pump shuts off and the valve closes. If at any time the boiler return temperature falls below 135°F (57°C), the purge is
canceled. During the WWSD, the control exercises the pump for 10 seconds every 3 days of no activity.
Section C: Control Settings
OUTDOOR RESET SETTINGS
Note: For single boiler installations only. When multiple boilers are installed, use an appropriate staging control for outdoor reset
functions.
Room
The ROOM setting is the desired room temperature in the heating zone.
The ROOM setting provides a method to parallel shift the reset ratio
so that higher (or lower) mix water target temperatures are available
over the entire reset range. Adjusting the ROOM setting increases or
decreases the heat delivery to the building.
Mixing Design (MIX DSGN)
The MIX DSGN temperature is the supply water temperature required
to heat the mixing zones when the outdoor air temperature is as cold as the OUTDR DSGN Setting.
Outdoor Design (OUTDR DSGN)
The OUTDR DSGN is the outdoor air temperature that is the typical coldest temperature of the year where the building is located.
This temperature is used when doing the heat loss calculations for the building. If a cold outdoor design temperature is selected,
the mix supply temperature rises gradually as the outdoor temperature drops. If a warm outdoor design temperature is selected,
the mix supply temperature rises rapidly as the outdoor temperature drops.
Warm Weather Shut Down (WWSD)
When the outdoor air temperature rises above the WWSD setting, the control turns on the WWSD segment in the display. When
the control is in WWSD, the Demand pointer is displayed, if there is a demand. However, the control does not operate the heating
system to satisfy this demand. If the control is in setpoint mode, the WWSD feature is not functional.
Mixing Minimum (MIX MIN)
The MIX MIN is the lowest temperature that the control is allowed
to use as a mix target temperature. During mild conditions, if the
control calculates a mix target temperature that is below the MIX MIN
setting, the mix target temperature is adjusted to match the MIX MIN
setting. During this condition, the MIN segment will be displayed in
the LCD when either the MIX TARGET or MIX temperature is being
viewed.
Mixing Maximum (MIX MAX)
The MIX MAX sets the highest water temperature that the control
is allowed to calculate as the mix target temperature. If the control
does target the MIX MAX setting, and the MIX temperature is near
the MIX MAX, the MAX segment will be displayed in the LCD while
either the MIX TARGET temperature or the MIX temperature is
being viewed.
Parallel Shift
Using the
ROOM Setting
Parallel Shift
Using the
ROOM Setting
upup
downdown
6060
-40-40-20-20002020404060608080
8080
100100
120120
140140
160160
180180
200200
Mix
Design
Mix
Design
Mix
Maximum
Mix
Maximum
Mix
Minimum
Mix
Minimum
Outdoor
Design
Outdoor
Design
FixedFixed
Outdoor TemperatureOutdoor Temperature
Supply Water TemperatureSupply Water Temperature
WWSDWWSD
- P/N 81460382 1 of 60 1
- How To Use This Manual 2
- User Interface 2
- Table of Contents 2
- Symbol Description 3
- Sequence of Operation 3
- Section A: General Operation 3
- Section B: Control Operation 4
- Section C: Control Settings 5
- 6 of 60 6
- Installation 7
- 8 of 60 8
- 9 of 60 9
- 10 of 60 10
- 11 of 60 11
- 12 of 60 12
- 13 of 60 13
- 14 of 60 14
- Diverting Valve Actuator 15
- Test the Powered Inputs 17
- Heat Demand 17
- Test the Sensors 17
- Test the Power Supply 17
- 120 V (ac) 18
- Boiler Recirculating 18
- STEP EIGHT 19
- CLEANING THE CONTROL 19
- Display Description 20
- View Menu (1 of 1) 20
- Adjust Menu (1 of 1) 21
- Troubleshooting 22
- Testing the Control 22
- Isolate the 23
- Test the Contacts 23
- Voltages and 23
- STRAPCTR relioB/ytQ 24
- 26 of 60 26
- Burnham RTC 27
- 28 of 60 28
- 30 of 60 30
- 32 of 60 32
- 34 of 60 34
- 36 of 60 36
- 38 of 60 38
- 40 of 60 40
- 43 of 60 43
- 45 of 60 45
- Appendix B1 46
- Appendix B2 47
- Appendix B3 48
- Appendix B4 49
- Appendix B5 50
- Appendix B6 52
- Appendix B7 54
- Appendix B8 56
- 58 of 60 58
- Technical Data 59
- Printed in Canada. - 06/03 60
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