10
Harsco Industrial, Patterson-Kelley Technical Service 1.877.728.5351
INST
alla
TION
Gas Fired Boiler
DhW Pump Relay w/ Delay Off
– This output is enabled when there is
a call for
DHW
When the call for heat is removed, the output remains enabled for the post pump time parameter
within the
DHW
settings. This output provides
120 VAC
, 0.5 Amp service to
TB2-12
. The neutral for this circuit is
provided on
TB2-5
.
Circ Pump Relay w/ Delay Off
– This output is enabled when there is a call for heat. When the call for heat
is removed, the output remains enabled for the post pump time parameter within the CH settings. This output
provides
120 VAC
, 0.5 Amp service to
TB2-13
. The neutral for this circuit is provided on
TB2-6
.
Damper Relay
– This output is enabled when the call for heat is enabled. This output provides
120 VAC
service
to
TB2-14
. The neutral for this circuit is provided on
TB2-7
. This circuit is for pilot duty only.
master Alarm Relay
– This is a dry set of contacts that are normally open and will close in the event of an alarm
output from the boiler control, connecting
TB2-15
and
TB2-16
.
Flame Detected Relay
– This is a dry set of contacts that are normally open and will close whenever the boiler
control is reading a flame, connecting
TB2-17
and
TB2-18
.
11
Harsco Industrial, Patterson-Kelley Technical Service 1.877.728.5351
INST
alla
TION
Gas Fired Boiler
3.4.2 high Voltage (
tB2
) terminal Block
3.4.3 low Voltage (tB1) terminal Block
enable/Disable
–
TB1-1
and
TB1-2
are used for enabling the boiler (factory installed jumper). Closing this circuit
allows the boiler to run. Opening this circuit prevents the boiler from running. This circuit is energized by the boiler.
It has a
24 VAC
potential. Devices connected to these terminals must be rated for
24 VAC
Note: this circuit will be
changed by certain Ch modes and Cascade master modes. * Note 1
external Interlock
–
TB1-3
and
TB1-4
are used for attachment of an additional field safety device to the boiler
control circuit (factory installed jumper). Closing this circuit allows the boiler to run. Opening this circuit prevents the
boiler from running. This circuit is energized by the boiler with a
5V
potential. Devices connected to these terminals
must be rated for
5V
.
Outdoor temp sensor
–
TB1-5
and
TB1-6
are connected to the outdoor temperature sensor. The temperature
control must be programmed to run an outdoor air schedule. The outdoor air sensor and programming help are
available from the local Harsco Industrial, Patterson-Kelley Representative. This circuit is energized by the boiler
with a
5V
potential. The temperature sensor must be a NTC having 12k @ 77°F.
DhW stat/sensor
–
TB1-7
and
TB1-8
are connected to the
DHW
temperature sensor or thermostat. This circuit is
energized by the boiler with a
5V
potential. The temperature sensor must be a
NTC
having 1
2k @ 77°F
.
header temp sensor
–
TB1-9
and
TB1-10
are connected to the header temperature sensor. This circuit is
energized by the boiler with a
5V
potential. The temperature sensor must be a
NTC
having
12k @ 77°F
.
DhW Flow switch
–
TB1-11
is energized by the boiler with a
5V
potential. This circuit connects through a flow
switch on the domestic side of a domestic hot water system. The flow switch should close upon flow to provide a
closed circuit back to
TB1-12
.
Analog Input
– Remote signal for controlling the boiler. The boiler can be operated in a remote setpoint or a
remote firing rate control mode. Input
0-10 VDC+
signal on
TB1-13
only. The 0
VDC
- Analog Input is provided on
TB1-14
. The temperature control must be programmed to run with the analog input.
* Note 1
mODBus®
–
TB1-17
and
TB1-18
are used for connecting a
MODBUS®
building management system. *
Note 1
Cascade
–
TB1-19
and
TB1-20
are used to connect between boilers that are part of a Master/Member Network. Up
to 24 boilers may be connected together.
* Note 1
*NOTE 1 - Refer to ENVI® Control Advanced Users Guide (Part # 1004905953) for more information.
The high voltage (
TB2
) terminal
block contains
120 VAC
output pilot
duty. Do not connect any
120 VAC
supply voltage to the high voltage
(
TB2
) terminal block. Connecting a
120 VAC supply voltage to
TB2
can
result in serious injury or death.
Be sure to check the nameplate on
the boiler before connecting
electrical supply.
!
CAUTION
A dedicated earth ground (green
wire) is required to avoid nuisance
shutdowns. Do not ground through
the conduit.
n
oTICe
!
!
WARNING
The
SC-3000
and
SC-4000
boiler may be supplied from the factory as
either
208–240 VAC
or
440-480 VAC
. Refer to Sections
6.1.4
and
6.1.5
for
proper wiring and configuration of the internal control transformer.
C
odes
united states:
NFPA 54/ANSI Z223.1
National Fuel Gas Code
NFPA/ANSI 211
Chimneys, Fireplaces, Vents and Solid Fuel Burning Appliances
Canada:
CAN/CSA B149.1
Installation Codes for Gas Burning Equipment
s
Tandards
UL 1738
Venting Systems for Gas-Burning Appliances, Categories II, III, and IV
ULC S636-95
Standard for Type BH Venting Systems
Sheet Metal and Thermoplastic Duct Construction Manual Air Conditioning
Contractors National Association (SMACNA)
These codes and standards contain information for the venting of gas fired appliances, including, but not limited
to vent sizing, location, clearance to combustibles, and safe installation practices. The installation must comply
with both the above Federal Codes and with state, provincial and local codes.
3.5 I
nleT
a
Ir
and
e
xhausT
v
enTIng
3.5.1 Applicable Codes and standards
Refer to sections 6.1.4, 6.1.5 and 6.2.2 for proper wiring and configuration of the electrical connections.
