Outdoor Reset Operation - Weil-McLain SlimFit Manual

SlimFit
™
commercial condensing gas
Sola control overview & sequence of operation
10. At the end of the CH-heat request the burner is
switched off and the blower stays on until post purge
is complete.
11. A new CH-request is blocked for the forced off time
set by the Anti Short Cycle parameter (adjustable, with
default setting of 1 minute).
12. The pump stays on during the pump overrun time.
13. At the end of the pump overrun time the pump will
be switched off.
Domestic Hot Water operating sequence
1. Heat request detected (DHW aquastat closes).
2. The DHW pump is switched on.
3. After a system Safe Start Check, the Blower is switched
on.
4. After the ILK circuit is closed and the purge rate proving
blower RPM is achieved — prepurge time is started.
5. When the purge time is complete, the purge blower
RPM is changed to the Ignition Rate.
6. As soon as the blower rpm is equal to the ignition rpm,
the Trial for Ignition is started.
7. The ignition and the gas valve are switched on.
8. The ignition is turned off at the end of the direct burner
ignition period
9. The blower is kept at the ignition rate during the sta-
bilization period.
10. At the end of the DHW-heat request the burner is
switched off and the blower stays on until post purge
is complete.
11. The pump stays on during the pump overrun time.
12. At the end of the pump overrun time the pump will
be switched off.
Part number 550-100-116/0713
-
fired water boiler

Outdoor reset operation

1. See Figure 58 for an example reset curve. Reach Configuration menus men-
tioned below via Home
shown on the graph explained below.
2. Normal setpoint
a. This is the space heating temperature setting in CH–Central heat con-
figuration Setpoint tab
3. Low water
a. This is from Outdoor Reset Configuration
This is the target temperature at Max outdoor.
4. Minimum water
a. This is the value in Outdoor Reset Configuration
water temperature. The sola will never use a target temperature less
than this value.
5. Maximum and minimum outdoor
a. These are the values from Outdoor Reset Configuration
outdoor temperature and Minimum outdoor temperature.
6. How operating target temperature is determined
a. At outdoor temperatures between Maximum and Minimum outdoor
(sloped portion of the graph), the Sola control uses a space heating target
temperature equal to the value on the curve.
b. Outside this range (flat line sections of the graph at upper and lower
ends), the Sola control uses a fixed value (equal to the Normal setpoint
temperature, Minimum water temperature, or Low water temperature).
Figure 58
Typical outdoor reset curve (snapshot from:
HOME PAGE
Configuration
— Boiler Manual
Boiler Icon Configuration. The parameters
Setpoint.
Low water temperature.
Configuration Outdoor Reset
Show Line)
(cont.)
Minimum boiler
Maximum
59