24
Harsco Industrial, Patterson-Kelley Technical Service 1.877.728.5351
INST
alla
TION
Gas Fired Boiler
25
Harsco Industrial, Patterson-Kelley Technical Service 1.877.728.5351
INST
alla
TION
Gas Fired Boiler
Additional
CH
Parameters are available and used for
the various
CH
Modes other than mode 0, the standard
Setpoint & (Thermo)Stat control mode. These modes are
further described in the
ENVI®
Control Advanced User’s
Guide.
The standby screen is shown upon startup. This screen shows the date,
time, boiler status, supply temp and setpoint temp. Pushing the menu
button displays a menu of options. The menu includes access to the
Standby, Information, Errors, Program Parameters, Configuration, Cascade,
and Service Menu. The Up and Down buttons are used to position the
arrow next to the desired option and the enter button is pushed to enter that
option. The list is displayed and may have more than four lines. Use the down arrow to view the complete list.
Operating Temperature Controller, continued
The factory default setpoint is 180 °F. If a different setpoint is desired, push the menu button and then select
PARAMETERS
from the menu. A screen opens that allows the user to view and change operating parameters.
Select the CH settings to adjust parameters related to the boilers Comfort Heat function.
3.10.2 Boiler set Point
3.10.3 Other Ch Parameters
For example, selecting the Setpoint parameter opens up a screen that allows the setpoint to be changed. The up
or down buttons are used to adjust the CH setpoint up or down as desired. The enter button is pushed once the
desired temperature is reached.
3.10.4 Other Parameters
Other parameters include the settings for
DHW
(Domestic Hot Water), Boiler Settings and
OEM
Settings.
Boiler and
OEM
Settings are used during the initial
programming of the control and are not adjustable.
3.10.5 Additional menu Items
In the main menu, Standby, Information, Errors, Program Parameters, Configuration, Cascade, and Service
Menus are available. They are used for various functions of the boiler. These functions are described further in
the
ENVI®
Control Advanced User’s Guide.
These menu items will be described briefly here:
• STANDBY is the default screen and is shown during normal boiler operation.
• The INFORMATION menu lists items that the boiler monitors such as temperatures, operating conditions, and status of
switches and components.
• The ERRORS menu has information about the boiler status at the time of an error.
• The PARAMETERS menu allows the user to set up selected boiler functions and operating modes.
• The CONFIGURATION menu covers basic display information such as language, units, date/time, etc.
• The CASCADE menu is used to sequence multiple boilers (up to 24 max) in a Master/Member network system. Use of this
function is described in detail in the Advanced User’s Guide.
3.10.6 Service Menu
Two test modes are available in the service menu.
BNR ON TEST HI LOW
BNR OFF FAN HI LOW
The first test mode allows the service technician to hold the boiler in high or low
fire during firing operation so that the combustion adjustment can be performed as indicated below.
The second test mode checks the fan rate with the burner off at high speed or at low speed.
These test modes will automatically terminate after 15 minutes of inactivity or can be terminated from the control/
display panel by pressing the cancel/reset button.
The SC-3000 and SC-4000 boilers
are equipped with a gas/air ratio
control valve and a gas safety shut
off control valve, combined into
one valve assembly. The valve
functions in series with the variable
speed combustion blower to
supply the correct gas air ratio for
optimum firing performance and
efficiency. The combustion blower speed is controlled automatically by the
boiler controller. The blower speed determines the amount of air flow and
the amount of suction/negative pressure at the gas valves. The gas valve
adjusts gas flow to maintain the proper delivery pressure at the outlet of
the valve.
3.11 f
uel
/a
Ir
a
djusTMenT
n
oTICe
!
Adjustments shall only be
performed by qualified and
knowledgeable installer or service
agency specifically trained and
certified to perform maintenance
and/or startup on the Harsco
Industrial, Patterson-Kelley®
boiler.
3.11.1 Gas Pressure Adjustment
See rating plate for the minimum and maximum gas pressure of the boiler.
The supply pressure during main burner operation must be greater than the
minimum indicated on the rating plate. Nominal gas supply pressure is 7” wc for natural gas. The gas pressure
must not exceed 14” wc which is the maximum allowable pressure on the gas train components. Each boiler is
furnished with a manual shut-off valve which has an integrated test port. This port is located on the upstream side
of the valve body for measuring supply pressure. (See Figure 3.10.6b)
The air flow is pre-set at the factory prior to shipment. Gas flow is dependent primarily on fan speed not upstream
gas pressure. The automatic gas valve may have to be adjusted to obtain proper combustion readings for specific
local conditions. A combustion analyzer must be used. Combustion should be set in accordance with
Table 3.11.2
.
Fuel
Nominal Gas Pressure High Fire Setting
Low Fire Setting
% O
2
% CO
2
% O
2
% CO
2
Natural Gas
7" wc
4.8
±
0.2
9.2
±
0.1 5.0
±
0.2
9.1
±
0.1
Propane Gas
11" wc
4.8
±
0.2 10.4
±
0.3 5.0
±
0.2 10.3
±
0.3
3.11.2 Combustion setup and Adjustment
Set the combustion using the Service Menu
BNR ON TEST HI
&
BNR ON TEST LOW
modes. These test modes
should be used when checking and setting the gas safety shut off/control valves on the
SC-3000
or
SC-4000
boiler.
In this mode a heat request is required. Once the boiler cycles on, use the arrow keys to access the Service
Menu and select the
BNR ON TEST HI
or the
BNR ON TEST LOW
mode and push enter. The boiler will ramp up to
high or low fire.
Description
Value
units
CH Setpoint
###
o
F
BLR OP (Off = 0, On = 1, Off/Pump
On = 2, and On/Pump On = 3)
#
0-3
CH Mode
#
0-8
Hysteresis On (On Differential)
##
o
F
Hysteresis Off (Off Differential
##
o
F
Post Pump Time
###
Sec
Figure 3.10.1b
Figure 3.10.2b
Figure 3.10.2c
Figure 3.10.2a
Table 3.10.3
Figure 3.10.6a
Figure 3.10.6b
Table 3.11.2 (PLACE Holder)
