Crown Boiler TWB Series, Руководство по установке

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36
NOTE: DHW Priority: During a call from an indirect water heater, the control will de-energize the circulator contacts
( C1 / C2 ) to heat only the indirect tank ensuring an adequate supply of domestic hot water. The control will re-energize
the circulator when the indirect tank is satisfied or if the boiler temperature reaches 170°F. If the indirect call continues for 45
minutes, the control will override the priority function energizing the circulator to provide space heating.
C. Optional Features
NOTE: The Program Mode -
Pro
- is accessed by turning the LO TEMP dial to a position just above OFF.
1) Thermal Pre-Purge - Thermal Pre-Purge is designed to maximize boiler efficiency. When activated, the control will supply
latent heat that may remain in the boiler from a previous run cycle to the heating zone that is now calling. The control
monitors how quickly the boiler temperature is declining and activates the burner only when it determines that the latent heat
is insufficient to satisfy the call. During the purge cycle, the display will indicate Pur. This feature works with single-zone
and multi-zone heating systems utilizing circulators or zone valves. No change in wiring is needed.
To activate Thermal Pre-Purge
1. Turn the LO TEMP dial to access the Program Mode – indicated in the display as
Pro
2. Turn the HI TEMP dial to select feature
1
3. Push the Test/Settings Button to turn Thermal Pre-Purge
on
or
OFF
4. Reset LO TEMP and HI TEMP settings to desired temperatures (see page 35)
2) Degrees Fahrenheit or Celsius - The control has the ability to operate in degrees Fahrenheit or Celsius. When operating in
Celsius, a
c
will appear in the display next to the temperature whenever the temperature is below 100 degrees.
To change between degrees Fahrenheit and degrees Celsius
1. Turn the LO TEMP dial to access the Program Mode – indicated in the display as
Pro
2. Turn the HI TEMP dial to select feature
2
3. Push the Test/Settings Button to
c
for Celsius or
F
for Fahrenheit
1. Reset LO TEMP and HI TEMP settings to desired temperatures (see page 35)
3) Manual Reset Low Water Cut-Off - The low water cut-off operation on the HydroStat can be set to operate in automatic
(default) or manual reset mode. When in manual reset mode, the control will shut-down the burner immediately when a low
water condition is detected. If the low water condition is sustained for 30 seconds, the low water light will blink, indicating
that the control has locked out the burner. The control can only be reset by pushing the Test Settings button on the top of the
control. The manual reset feature meets CSD-1 code requirements.
To activate Manual Reset LWCO mode
1. Turn the LO TEMP dial to access the Program Mode – indicated in the display as
Pro
2. Turn the HI TEMP dial to select feature
3
3. Push the Test/Settings Button to
A
for Automatic Reset Mode or
b
for Manual Reset Mode
4. Reset LO TEMP and HI TEMP settings to desired temperatures (see page 35)
To Test the Manual Reset Feature: Press and hold the Test/Settings button located on the top of the control for
30 seconds to simulate a low water condition. After 30 seconds, the Low Water light will blink indicating that the
control is locked out. To reset the lock-out condition, press the Test/Settings button momentarily.
4) Circulator Activation Options - When in the default mode, the control activates the circulator ( C1/C2 contacts) on calls to
TT . The control can be programmed to activate the circulator on calls to ZC/ZR in place of, or in addition to, calls to TT .
To change how the Circulator is activated
1. Turn the LO TEMP dial to access the Program Mode – indicated in the display as
Pro
2. Turn the HI TEMP dial to select feature
4
3. Push the Test/Settings Button to select between the following options:
A
- Circulator on TT call only
b
- Circulator on ZC/ZR call only
C
- Circulator on both
TT
&
ZC/ZR
calls
4. Reset LO TEMP and HI TEMP settings to desired temperatures (see page 35)