Initial Adjustments; Operating Temperature Controller For Lo-Hi-Lo Thermific - Patterson-Kelley Thermific Installation & Owner's Manual

®
Thermific Gas-Fired Boiler
3.12 I A
NITIAL DJUSTMENTS
3.12.1 Operating Temperature Controller for
®
Lo-Hi-Lo Thermific
The two stages of this boiler are operated by pro-
gramming each set point and differential into the con-
troller. The boiler will be turned on at set point 1 mi-
nus its differential and turned off at set point 1. The
Hi fire operation of the boiler will be energized at set
point 2 minus its differential and de-energized at set
point 2.
Example:
Set point 1 at 180º F with a 20º F differential, and
Set point 2 at 170º F with a 15º F differential.
Note: the set points should be adjusted for system re-
quirements.
In this example, the boiler would operate as follows:
Stage 1 energized (Boiler/Low fire turned on) at
160º F.
Stage 1 de-energized (Boiler turned off) at 180º F.
Stage 2 energized (Hi fire on) at 155º F.
Stage 2 de-energized (Hi fire off/Low fire on) at
170º F.
Contact your local P-K service representative for assis-
tance adjusting your Lo-Hi-Lo operating temperature
control to meet system requirements.
Record setting in the Programming worksheet for fu-
ture reference.
Programming Worksheet
Stage 1:
SetPt 1: (Ta)
Diff 1: (Tdl)
On at (Tb)
Off at (Ta)
Stage 2:
SetPt 2:
Diff 2:
Select
To adjust operating temperature controller:
1. Turn the boiler ON. The controller will begin
counting down from 210. This countdown se-
quence will last for approximately 3-1/2 minutes.
2. To override this time delay, press Select.
3. Press Select to display the current stage setpoint.
4. Press Up Arrow to increase or Down Arrow to
decrease to the desired setpoint.
5. Press Enter to enter the displayed value into mem-
ory; (you must press enter to save each value into
the controller).
6. Press Select to display the current stage switching
differential.
7. Press Up Arrow to increase or Down Arrow to
decrease to the desired switching differential.
8. Press Enter to enter the displayed value into mem-
ory (you must press enter to save each value into
the controller).
9. Repeat steps 3 through 8 to program stage 2.
10. Press Select Select (2 times) to return to stage 1
parameters. Scroll through the programming loop
a second time to confirm that the appropriate val-
ues have been entered into memory by pressing
Select.
Note: The control values programmed into memory
will not be lost because of a power failure.
Page 15
(Tb) On at
(Td2) Off at
Set
Lo-Hi-Lo Operating Temperature Controller
Installation
(Tc)
(Tb)
Enter