PureFire PFA-1 Interface Adaptor Installation, Operation, and Maintenance Manual

ManualsBrandsPeerless ManualsBoilersPF-210 - 193K BTU - 93.3% AFUE - Hot Water Gas Boiler - Direct Vent

A. OVERVIEW

The PFA-1 Interface Adapter is designed to allow for

electronic interface between the P

UREFIRE main control

and other electronic devices.

1. Alarm Output and External Reset Input:

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 typically provided by a Building Automation

system.

For Cascade installations, only one PFA-1 Adapter 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 boiler status information using MODBUS RTU

protocol. This provides remote access to

Temperatures, Operating Status and Error

Information as applicable.

One PFA-1 control is required for each boiler to

which Modbus communication is desired. In a

multiple boiler cascade control configuration, each

boiler must be equipped with a PFA-1 Interface

Control to allow full communication.

a. Temperatures

: Supply, Return, DHW and Vent

Temperatures can be monitored. In addition, the

System Temperature in a multiple boiler

(cascade) system can be accessed.

b. Operating Status

: The boiler status can be

monitored to determine if the boiler is in

Standby, Prepurge, Ignition, Firing, Postpurge or

Alarm conditions. It can also indicate if it is

satisfying a central heating (CH) or domestic hot

water (DHW) demand.

c. Error Information

: If the boiler is in a lockout or

blocking error, the interface will allow access to

the error code.

B. PRE-INSTALLATION

1. PF-210 & PF-399 boilers come equipped with pre-

wired harnesses to connect to the PFA-1 Interface

Adapter. If modbus is required, two additional wires

(provided with kit) must be connected 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

required for each unit. For multiple boiler installations,

one PFA-1 Interface Adapter will provide Alarm

information, Setpoint control, and/or Modbus interface

for the system. If individual boiler information is

required, an interface unit is required for each of them.

4. The PFA-1 Interface Adapter is designed to fit within

the P

UREFIRE boiler jacket. This manual will provide

suggested mounting locations and wiring diagrams.

C. INSTALLATION

1. Figure 1 shows the suggested mounting location for

the 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.

2. Figure 2 shows the suggested mounting location for

the PFA-1 Interface Adapter on the PF-210 and PF-

399 boilers.

• These boilers come with pre-wired harnesses for

connection of the adapter. If modbus is required,

two additional wires (provided with kit) must be

connected as shown below.

3. Attach PFA-1 Adapter to jacket panel using adhesive-

backed Velcro provided with the kit.

Peerless

PUREFIRE

PFA-1 Interface Adapter

Installation, Operation and Maintenance Manual

Figure 1

Figure 2

Summary of content (8 pages)

PAGE 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 and External Reset Input: 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.
PAGE 2
PUREFIRE PFA-1 INTERFACE ADAPTER D. ELECTRICAL – WIRING 1. Figure 3 shows customer wiring connections for the PFA-1 Interface Board. 2. PF-210 & PF-399 boilers are equipped with harnesses that provide power and communication to the Interface Board, and alarm contact output to the boiler terminal strip. Connect alarm to boiler terminal strip. 3. Analog Input (where used): a.
PAGE 3
PUREFIRE PFA-1 INTERFACE ADAPTER 2. Analog Input of Rate: Input voltage below 2 volts dc will disable boiler operation. 2 volts corresponds to minimum boiler input which will display as 1% Input on the RC Display (see boiler manual for minimum input ratings). 10 volts corresponds to maximum boiler input, and voltages in between will linearly adjust the input rate. 2. Modbus Holding Registers: Modbus communicates using “words” (the contents of 16 bit holding registers).
PAGE 4
PUREFIRE PFA-1 INTERFACE ADAPTER Table 3 Control State Descriptions STATE State Name Description Decimal Hexadecimal 0 0x00 RESET_0 Initialization 1 0x01 RESET_1 Initialization 2 0x02 STANDBY_0 Standby waiting for heat demand 3 0x03 SAFETY_ON Ignition Sequence 4 0x04 SAFETY_OFF Ignition Sequence 5 0x05 PRE_PURGE Ignition Sequence 6 0x06 PRE_PURGE_1 Ignition Sequence 7 0x07 IGNIT_0 Ignition Sequence 8 0x08 IGNIT_1 Ignition Sequence 9 0x09 BURN_0 Following Boiler De
PAGE 5
PUREFIRE PFA-1 INTERFACE ADAPTER Table 5 Determination of General Control Status Control Status STATE Value ERROR_NUMBER Value Control is not Communicating Properly 0x00 0x00 Control is Operating Correctly with No Errors Not 0x00 0xFF Control is Operating Correctly with Errors Not 0x00 Not 0xFF Table 6 describes the ERROR_NUMBER values for Lockout Errors. These are errors that require a manual reset to continue boiler operation. Table 7 describes the ERROR_NUMBER values for Blocking Errors.
PAGE 6
PUREFIRE PFA-1 INTERFACE ADAPTER Table 6B ERROR_NUMBER (Blocking Errors) Error Number Error Designation Description Decimal Hexadecimal 31 0x1F REFHI_TOO_LO_ERROR Internal Software Error 32 0x20 REFHI_TOO_HI_ERROR Internal Software Error 33 0x21 REFLO_TOO_LO_ERROR Internal Software Error 34 0x22 REFLO_TOO_HI_ERROR Internal Software Error 35 0x23 FLAME_ERROR_2 False Flame Detected 36 0x24 LOW_WATER_CUTOFF_ERROR Low Water Cutoff 39 0x27 FLUE_GAS_ERROR High Vent Temperature 40
PAGE 7
PUREFIRE PFA-1 INTERFACE ADAPTER - 3. Modbus Holding Registers (Read/Write): The PFA-1 control has holding registers that allow CH and DHW Setpoints to be written using Modbus commands. Table 8 shows the Modbus Holding Registers for Read/Write Control. b. To change the DHW setpoint: 4. Controlling Main Board Parameters: a. To change the CH setpoint: - - Issue a Modbus Write single holding register command to rite the scaled temperature setpoint value to the 0x001E holding register.