Patterson-Kelley MOD-04 ユーザーズマニュアル

 20 

The configuration level is used to set up the control 
for the sensors used, and the functioning of the 
alarm relay.  The configuration level must be ad-
justed by factory-trained personnel only. 

 

This option is used when the firing rate of the boiler 
is controlled by an external analog signal, usually 
from a multiple boiler control.  The boiler turns on 
and off as directed by the external control. 

An operating limit control ensures that the boiler 
temperature does not exceed the set value. 
 
 
 

 

 

 

Local control is used for setting up and testing the 
boiler.  Local control of the boiler firing rate can be 
obtained by placing the Remote/Local switch in the 
local position (This does not bypass # 1 start inter-
lock, # 1 start interlock must be made for the boiler 
to fire).  With the boiler in local mode, the up/down 
switch can be used to control the firing rate of the 
boiler.  Pressing this switch in the up direction in-
creases the firing rate.  Placing this switch in the 
down position decreases the firing rate.  
 
To operate the boiler independently from the BMS 
(Building Management System) or sequencer, an 
external bypass switch of the BMS must be installed 
by the control contractor.   
 

Do not bypass any safety limits with this switch. 

 

The air flow is pre-set at the factory prior to ship-
ment.  The air (and gas) may have to be adjusted for 
local conditions.  All air flow adjustments must be 
performed by factory-trained personnel. 

The air and gas are adjusted at two firing rates: High 
fire and Low fire.  The boiler modulates between 
these two rates to maintain a steady outlet tempera-
ture. 

Fuel adjustments for proper fuel/air ratio are made 
first at High fire, then at Low fire. 
 

 

 
 

 

 
The air flow rates are adjusted by setting the end 
switches in the damper actuator.  The red end switch 
sets the High fire position.  The blue end switch sets 
the Low fire position.  To set the position of the 
switch, rotate the colored wheel corresponding to 
either High fire or Low fire until it indicates the de-
sired setting.  Once the desired setting is set, move 
the damper to a mid position and then back to either 
Low or High fire as desired. 

The red air flow cam should be set so that the cabi-
net pressure at High fire is at or below that indicated 
on the rating plate for High fire.  The blue cam 
should be set so that the cabinet pressure at Low fire 
is at or above that indicated on the rating plate for 
Low fire. 

The cabinet air pressure at Low fire must be at least 
0.3” w.c. 

 

Firing Rate 

Remote/ 

Local 

Red

Blue