Crown Boiler AWR Series Installation Instructions Manual page 37

Call for
Example Heat
# From
1 T-T
2 T-T
3 DHW
Heat T'stat
4 on DHW
terminals
5 T-T
6 T-T
or if there is a problem with the DHW zone which causes the DHW demand to be indefinite. Figure 11.7 describes the behavior of
both the Heating and DHW Circulators with Pt turned both ON and OFF.
dh (Use of DHW zone) - Although the second zone on the boiler is designated "DHW", it can be used as a second heating zone by
setting dh = "tt2" instead of dh="dh". When the "DHW" zone is used for heating, the thermal purge function is active when this
zone calls for heat. When dh = tt2, the setting of Pt (DHW priority) is ignored.
rst (Reset) - Used to reset the boiler from a hard lockout (as an alternative to momentarily interrupting power to the control).
Pressing the up key will turn rst momentarily to on. When it goes back off (typically within one or two seconds), the control is
reset.
F-C (Temperature Units ) - Determines whether temperature units on the S9361A are displayed in F or C. Note that this selection
only applies to the temperature displayed on the LED shown in Figure 11.0.
TABLE 11.6 EXAMPLES OF THERMAL PURGE OPERATION
Thermal Purge Settings
Use of
DHW Zone Time (Pt)
N/A 2 min.
N/A 2 min.
2 min.
DHW (dh=dh)
2 min.
Heat (dh=tt2)
N/A 2 min.
N/A 3 min.
Boiler
Temp at
Start Temp Begin
(St) Call
140F 130
140F 150
140F 150
140F 150
145F 150
140 150
37
Boiler Behavior
• Heating Circulator starts
immediately
• Burner fires immediately
• Heating Circulator starts
immediately
• Burner fires when either:
2 minutes have passed
OR
Temperature falls below 140
• DHW Circulator starts immediately
• Burner fires immediately
• "DHW" Circulator starts
immediately
• Burner fires when either:
2 minutes have passed
OR
Temperature falls below 140
• Heating Circulator starts
immediately
• Burner fires when either:
2 minutes have passed
OR
Temperature falls below 145
• Heating Circulator starts immedi-
ately
• Burner fires when either:
3 minutes have passed
OR
Temperature falls below 140