PEERLESS PUREFIRE PFA-1 User manual
1
Peerless®PUREFIRE ®PFA-1 Interface Adapter
Installation, Operation and Maintenance Manual
A. OVERVIEW
The PFA-1 Interface Adapter is designed to allow for
electronic interface between the PureFire®main control
and other electronic devices.
1. Alarm Output:
In the event of a blocking or locking error, the PFA-1
Interface adapter will provide a contact closure to signal
an external device (alarm bell, phone dialer, etc.) of a
problem.
2. Analog Input:
The PFA-1 Interface Adapter will accept an analog input
of 0-10VDC. This analog signal can be used to control
Setpoint Temperature or Gas Input Rate. This signal is
required per cascade system to control the System
Setpoint. If Analog control of Gas Input is required, one
InterFace Adapter is required per boiler.
3. Modbus Interface:
The PFA-1 Interface Adapter allows external access to
equipped with a PFA-1 Interface Control to allow full
a. Temperatures: Supply, Return, DHW and Vent
(cascade) system can be accessed.
b. : The boiler status can be monitored to
water (DHW) demand.
c. : If the boiler is in a lockout or blocking
error, the interface will allow access to the error code.
B. PRE-INSTALLATION
1. PF-200, PF-210, PF-300, and PF-399 boilers come
equipped with pre-wired harnesses to connect to the
PFA-1 Interface Adapter. If modbus is required, two
as shown below.
2. To connect to the PF-50, PF-80, PF-110 or PF-140 boilers,
harnesses (supplied with the PFA-1 Interface Adapter)
are required.
3. For stand alone boilers, one PFA-1 Interface Adapter is
one PFA-1 Interface Adapter will provide Alarm
required, an interface unit is required for each of them.
the PureFire®boiler jacket. This manual will provide
C. INSTALLATION
PFA-1 Interface Adapter on the PF-50, PF-80, PF-110 and
PF-140 boilers.
• These boilers require a PFA-1 Harness Adapter Kit
(provided) to connect to the boiler.
PFA-1 Interface Adapter on the PF-200, PF-210, PF-300,
and PF-399 boilers.
• These boilers come with pre-wired harnesses for
connected as shown below.
backed Velcro provided with the kit.
PFA-1
1"
11/16"
1 1/2"
6"
INSIDE VIEW:
LEFT SIDE PANEL
Figure 1
PFA-1
2"
6"
2 1/2"
I
NSIDE VIEW:
LEFT SIDE OF BASE PANEL
Figure 2
D. ELECTRICAL -WIRING
PFA-1 Interface Board.
2. PF-200, PF-210, PF-300, and PF-399 boilers are
equipped with harnesses that provide power and
contact output to the boiler terminal strip. Connect
alarm to boiler terminal strip.
3. Analog Input (where used):
a. For the PF-200, PF-210, PF-300, and PF-399,
connect the analog input device to terminals
#15 (-) and #16 (+) on the boiler terminal strip
located behind the remote control display.
b. For the PF-50, PF-80, PF-110, and PF-140 boilers,
connect the analog input device to the red wires
from the J5 connector of the Interface Adapter.
Be sure that these wires are connected with the
proper polarity.
E. OPERATION -ALARM CONTACTS
Alarm Output:
a. The alarm output is a normally open dry contact. If an
b. This output can be used with either line voltage or 24
volts to power a lamp, buzzer, phone dialer or building
management system.
F. OPERATION -ANALOG INPUT
For external control of setpoint temperature or input rate
of a PureFire®Boiler, a 2-10 volt dc analog signal is to be
applied as shown in Figure 3 to the analog input wires.
1. Analog Input at Setpoint:
Input voltage below 2 volts dc will disable boiler
temperature of 60°F and 10 volts corresponds to a boiler
setpoint temperature of 200°F. Input voltage between 2
and 10 volts will result in a boiler setpoint temperature
temperature and the 10 volt temperature. For example,
an input of 6 volts will result in a boiler setpoint
temperature of 130°F.
2
PUREFIRE PFA-1 INTERFACE ADAPTER
If the Analog Input is not connected and there is no
connecon between the red and red/white Analog
Input wire, the default input voltage is 2.5 Vdc.
Therefore, the boiler will likely run without an Analog
Input signal. In this case, all of the standard limits and
safety switches will connue to funcon properly.
NOTICE
Figure 3: Electrical Wiring
PUREFIRE PFA-1 INTERFACE ADAPTER
3
2. Analog Input of Rate:
Input voltage below 2 volts dc will disable boiler
which will display as 1% Input on the RC Display (see
corresponds to maximum boiler input, and voltages in
between will linearly adjust the input rate.
G. OPERATION
-MODBUS INTERFACE
1. Modbus Conguraon:
2. Modbus Holding Registers:
16 bit holding registers). The PFA-1 Interface Adapter
organizes the data in read-only holding registers. Table
and the address of the holding registers. Depending on
addressing range starts at either 0x0000 or 0x0001.
Modbus Conguraon Specicaons
Protocol
Default Address
Supported Commands • Read Holding Registers (0x03)*
• Write Single Holding Register (0x06)
Baud Rate 9600 bps
Data Length 8 bits
Parity
Stop Bits 1
Physical Layer RS485 (2 wire)
J7-1
J7-3
8 Registers Per Frame
Table 1
Modbus Holding Registers (Read Only)
Item Index
Parameter Name
Address & Holding Registers
Notes
Word byte Range Start
0x0000
Range Start
0x0001
0 High byte 0STATE 0x0000 0x0001 See Table 3
0 Low byte 1 0x0000 0x0001 See Table 4
2 High byte 2 0x0002 0x0003 See Table 6A and 6B
2 Low byte 3 0x0002 0x0003 See Table 7
4 High byte 4 0x0004 0x0005
oC = byte value - 10
2
oF = oC x 9 + 32
5
4 Low byte 5 0x0004 0x0005
6 High byte 6 0x0006 0x0007
6 Low byte 7 0x0006 0x0007
8 High byte 8 0x0008 0x0009
8 Low byte 9 0x0008 0x0009
10 High byte 10 0x000A 0x000B —
10 Low byte 11 0x000A 0x000B —
12 High byte 12 0x000C 0x000D —
12 Low byte 13 0x000C 0x000D —
14 High byte 14 0x000E 0x000F —
14 Low byte 15 0x000E 0x000F —
Table 2
shown in Table 4.
4
PUREFIRE PFA-1 INTERFACE ADAPTER
The following example describes how to read the temperature holding registers (byte 4-7 and 14-15). The boiler supply and return
the formula above, this is equivalent to 1.5°C (35°F).
Table 3
Control State Descripons
STATE State Name Descripon
Decimal Hexadecimal
0 0x00
1 0x01
2 0x02
3 0x03
4 0x04
5 0x05
6 0x06
7 0x07
8 0x08
9 0x09 Folllowing Boiler Demand
10 0x0A
11 0X0B
12 0x0C
13 0x0D
14 0x0E
15 0x0F
16 0x10 Error Handling
17 0x11 Error Handling
18 0x12 Controller (re)start
19 0x13 Error Handling
20 0x14 Error Handling
21 0x15 Error Handling
Table 4
Control State Descripons
STATE State Name Descripon
Decimal Hexadecimal
0 0x00
14 0x0E Error Handling
10 0x0A Error Handling
15 0x0F
16 0x10 CH
17 0x11
18 0x12 DHW Demand
19 0x13
20 0x14
21 0x15 DHW Demand (Store Warm Hold)
5
PUREFIRE PFA-1 INTERFACE ADAPTER
communicated.
Determinaon of General Control Status
Control Status STATE
Value
ERROR_NUMBER
Value
Control is not
0x00 0x00
0xFF
Correctly with Errors
Table 5
Table 6A
ERROR_NUMBER (Lockout Errors)
Error Number Error Designaon Descripon
Decimal Hexadecimal
0 0x00
1 0x01
5 0x05 Gas Valve Relay Problems
6 0x06 Internal Control Error
8 0x08 Incorrect Fan Speed
9 0x09 Internal Control Error
10 0x0A Internal Control Error
11 0x0B Boiler Return Tempurature Higher Than Supply
12 0x0C Internal Control Error
13 0x0D Internal Control Error
14 0x0E Internal Control Error
15 0X0F Internal Control Error
16 0x10 Internal Control Error
17 0x11 Internal Control Error
18 0x12
19 0x13 Internal Control Error
20 0x14
21 0x15
22 0x16 Internal Control Error
23 0x17 Internal Control Error
24 0x18
25 0x19
26 0x1A
27 0x1B Internal Control Error
28 0x1C Internal Control Error
29 0x1D Internal Control Error
30 0x1E Internal Control Error
6
PUREFIRE PFA-1 INTERFACE ADAPTER
Table 7
WARNING_NUMBER
Error Designaon Descripon
Decimal Hexadecimal
1 0X01
2 0X02
3 0X03 DHW Sensor Shorted
4 0X04
255 0XFF
Table 6B
ERROR_NUMBER (Blocking Errors)
Error Number Error Designaon Descripon
Decimal Hexadecimal
31 0x1F
32 0x20
33 0x21
34 0x22
35 0x23 False Flame Detected
36 0x24
39 0x27 High Vent Temperature
40 0x28 High Return Temperature (>194F; >90C)
41 0x29 Blocked Condensate Drain
43 0x2B
44 0x2C
45 0x2D Frequency ? 60 Hz ? 1.2 Hz
46 0x2E
47 0x2F Internal Hardware Error
51 0x33
52 0x34
55 0x37
56 0x38
57 0x39
59 0x3B Supply Sensor Shorted
60 0x3C Return Sensor Shorted
63 0x3F DHW Sensor Shorted
64 0x40 System Sensor Shorted
65 0x41 Flue Sensor Shorted
66 0x42
7
PUREFIRE PFA-1 INTERFACE ADAPTER
If no Modbus command is sensed for more than 4.25 seconds aer the Write Command is issued, the control resets
and the command must be re-issued to change the setpoint.
NOTICE
If an invalid value is wrien aer the Write Command is issued, the control resets and the command must be
re-issued to change the setpoint.
NOTICE
Modbus setpoints are maintained in volale memory. Therefore, if the control must be reset due to an lockout error,
a new value for CH and DHW must be wrien through Modbus. If this is not done, the control will default to the last
value saved for each of these parameters.
NOTICE
The PureFire®main control resets automacally every 24 hours. This will reset the CH and DHW setpoint values to
the last value saved for each of these parameters. A new Modbus command should be issued periodically for each
setpoint to be sure that the control is targeng the correct temperature.
NOTICE
3. Modbus Holding Registers (Read/Write):
The PFA-1 control has holding registers that allow
4. Controlling Main Board Parameters:
a. To change the CH setpoint:
- Calculate the scaled setpoint as follows:
(°C+10)x2x256=scaled value
to rite the scaled temperature setpoint value to the
0x001E holding register.
b. To change the DHW setpoint:
- Calculate the scaled setpoint as follows:
(°C+10) x 2 = scaled value
to write the scaled temperature setpoint value to the
0x001E holding register.
Modbus Holding Registers (Read/Write)
Item Index
Parameter Name
Address & Holding Registers
Notes
Word byte Range Start
0x0000
Range Start
0x0001
10 High byte 10 0x001A 0x001B (oC + 10) x 2 = byte value
(oF - 32) x 5= oC
9
10 Low byte 11 0x001A 0x001B
14 High byte 14 0x001E 0x001F
14 Low byte 15 0x001E 0x001F
Table 8
PF8108 R3 (05/23)
Printed in U.S.A.
©2023 PB Heat, LLC. All rights reserved.
PB HEAT, LLC
131 S. CHURCH STREET • BALLY, PA 19503
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