ECR International ARGO DPM-2 Instruction manual

Manufactured by:
ECR International Inc.
2201 Dwyer Avenue, Utica, NY 13501
Tel. 800 325-5479
www.ecrinternational.com
PN 240005132 Rev. D [11/15/2021]
INSTALLATION, OPER ATION
& MAINTENANCE MANUAL
Information and specications outlined in this manual in eect at the
time of printing of this manual. ECR International, Inc. reserves the
right to discontinue, change specications or system design at any
time without notice and without incurring any obligation, whatsoever.
ARGO DPM-2
OUTDOOR TEMPERATURE
SETBACK CONTROL
DPM-2

Safety Symbols and Warnings �������������������������������������������������������������������������������������������������������������3
Introduction��������������������������������������������������������������������������������������������������������������������������������������3
Product Description and Specications....................................................................................................3
DPM-2 Control Board Diagram�������������������������������������������������������������������������������������������������������������4
Mounting Instructions ������������������������������������������������������������������������������������������������������������������������5
OutdoorSensorInstallation�������������������������������������������������������������������������������������������������������������������5
Water SupplySensorInstallation������������������������������������������������������������������������������������������������������������5
Electrical Specications & Wiring ���������������������������������������������������������������������������������������������������������6
DPM-2 Setup�������������������������������������������������������������������������������������������������������������������������������������6
Wiring Applications�����������������������������������������������������������������������������������������������������������������������������7
Sequence of Operation ��������������������������������������������������������������������������������������������������������������������� 10
Troubleshooting������������������������������������������������������������������������������������������������������������������������������� 10
Replacement Parts ��������������������������������������������������������������������������������������������������������������������������� 11
Technical Support ���������������������������������������������������������������������������������������������������������������������������� 12
TABLE OF CONTENTS
Keep this manual near boiler
Retain for future reference
2
PN 240005132 Rev. D [11/15/2021]

INSTALLATION MANUAL AND OPERATING INSTRUCTIONS
NOTICE
Used to address practices not related to personal injury�
CAUTION
Indicates a hazardous situation which, if not avoided,
could result in minor or moderate injury�
!!
WARNING
Indicates a hazardous situation which, if not avoided,
could result in death or serious injury�
!
DANGER
Indicates a hazardous situation which, if not avoided,
WILL result in death or serious injury
!
This is the safety alert symbol� Symbol alerts you to
potential personal injury hazards� Obey all safety messages
following this symbol to avoid possible injury or death�
Become familiar with symbols identifying potential
hazards�
WARNING
Fire, explosion, asphyxiation and electrical shock
hazard� Improper installation could result in death
or serious injury� Read this manual and understand
all requirements before beginning installation�
!
DANIMPORTANT: Read and understand the fol-
lowing instructions COMPLETELY before install-
ing!!
Introduction
This manual is intended to familiarize the installer and user
of the Argo DPM-2 Outdoor Temperature Setback Control
with its installation and operation to assure normal trouble-
free operation�
Argo controls are designed and manufactured with quality
components for maximum life and durability and require
minimal service� To ensure a satisfactory installation, it is
imperative that the instructions be followed carefully before
operating the control� Failure to do so may result in breach
of warranty�
Product Description And Specications
DPM-2 Outdoor Temperature Setback Control is designed
to raise or lower the temperature of boiler supply water
based upon a proportionate drop or rise in temperature
at the outside sensor� This control plugs into Argo control
equipment with a data port or as a stand alone device that
can be easily wired into almost any system�
WARNING
Fire, Explosion, Asphyxiation, Electrical shock
hazard! Flooding will result in damages such as
electrical problems, corrosion, inoperative parts,
mold and other unforeseen issues which can
occur over time� Any equipment determined by
a professional as damaged by a ood, dened
as excess of water or other liquid, shall be
replaced� Failure to follow these directions will
result in a Hazardous Situation�
!
3
PN 240005132 Rev. D [11/15/2021]

INSTALLATION MANUAL AND OPERATING INSTRUCTIONS
DPM-2 CONTROL BOARD DIAGRAM
1 2 3
4
6
5
7
8
9
11 10
12
13
DIAGRAM KEY
1. Water Sensor Terminal Block
2. Outdoor Sensor Terminal Block
3. Priority Input Terminal Block
4. Priority LED
5. Max. Temp. Trim Pot
6. Dierential Trim Pot
7. Reset On LED
8. Power Switch
9. 24 VAC “IN”/Common Terminal Block
10. To Boiler T-T Terminal Block
11. From T-Stat or X-X Terminal Block
12. Ribbon Cable Data Port
13. Reset Ratio Trim Pot
4
PN 240005132 Rev. D [11/15/2021]

INSTALLATION MANUAL AND OPERATING INSTRUCTIONS
TECHNICAL SPECIFICATIONS
Power Supply: 20-28 VAC / 2 VA
Relay Capacity: 24 VAC / 48 VA
Sensor: 1005 Ohms at 70° F
(accurate up to 500’ with 18 gauge wire)
*See “RTD Sensor Troubleshooting” in
Section X for more information.
ADJUSTMENTS
Reset Ratio: 0.5-1.5
Max. Temp: 150°-210°
Dierential: 5°-15°
Mounting Instructions
Mount the Argo DPM-2 Control vertically on a solid wall or
partition� For your convenience it is recommended that the
control be mounted as close as possible to the device being
controlled, however it should never be mounted more then
75 feet away� Select a location that is easily accessible for
installation and service�
NOTE: To reduce the possible transformer hum and relay
noise that is sometimes amplied by mounting surfaces
such as sheet metal, plasterboard, and similar materials,
place rubber or felt washers between the case and the
mounting surface�
1.
Position the control and mark the mounting holes�
2.
Start screws (not provided) for the keyhole type
mounting holes in the upper corner(s)� Tighten the
screws down to about ⅛” (3mm) from the surface.
3.
Hang the control on the screw(s), position the case,
and start the bottom screws�
4.
Tighten all screws�
Outdoor Sensor Installation
It is important to install outdoor sensor (provided with
DPM-2) on the north side or shaded side of building� Locate
minimum of 10 feet above grade and not near any location
where internal heat could aect the sensor rating, such as
window, doors, exhaust vents or fans. See gure below.
Water Supply Sensor Installation
Install supply water sensor on common header within 5 feet
of supply water tapping in the boiler. See gure below.
5
PN 240005132 Rev. D [11/15/2021]

DPM-2 SETUP
Common Terminology
Reset Ratio: The ratio between supply water temperature
and outdoor temperature� For example, a ratio of 1�0 or
1:1 means, for every one degree the outdoor temperature
decreases, there will be a one degree increase in supply
water temperature�
Max. Temp: The maximum supply water temperature when
the outdoor temperature is 0°F�
Dierential: Measurement used to determine when the
boiler will turn on and o. A ten degree dierential will turn
the boiler on at ve degrees below the control point and
o at ve degrees above while a twenty degree dierential
will turn the boiler on at ten degrees above and o at ten
below. The eect of dierential is to prevent quick cycling of
the boiler�
General Wiring Notice
All primary wiring must be 14 AWG minimum. Torque
terminal screws 6 to 7 inch pounds.
U.S.A. - National Electric Code and any other nation-
al, state, or local code requirements. Wiring must be
N.E.C. Class 1.
CANADA - C.S.A. C22.1 Canadian Electrical Code
Part 1 and any other national, provincial, or local
code requirements. Wiring must be C.S.A. C22.1
C.E.C. Part 1.
INSTALLATION MANUAL AND OPERATING INSTRUCTIONS
Electrical Specications & Wiring
WARNING
Electrical shock hazard� Disconnect power before
installing or servicing� Failure to follow these
instructions could result in death or serious injury�
!
DPM-2 Control Set-up
1.
Determine the reset ratio and adjust “Reset Ratio Trim
Pot.” If heat curve is unknown, try ratio of 1.0.
2.
Turn “Max. Temp. Trim Pot” to design temperature of
supply water (water temperature needed when outdoor
temperature is 0°F)�
IMPORTANT: Boiler high limit must be set higher than
“Max. Temp.” setting plus “Dierential” or unit may operate
erratically�
3.
Set “Dierential Trim Pot” to scale (10°F). Boiler will
turn o when water is 5°F above control point and
back on again when water is 5°F below control point�
If boiler does “Quick Cycle,” increase trim pot. Optimal
performance is obtained when this setting is as low as
possible, but still allows for a reasonable cycle time�
6
PN 240005132 Rev. D [11/15/2021]

INSTALLATION MANUAL AND OPERATING INSTRUCTIONS
DPM-2 OUTDOOR TEMPERATURE SETBACK CONTROL
WITH ARGO AZ-3 ZONE VALVE CONTROL
DPM-2
SENSOR
OUTDOOR
SENSOR
WATER
TYPICAL WIRING APPLICATION USING DPM-2
OUTDOOR RESET WITH ARGO AZ-3 ZONE VALVE CONTROL
{
To T-T on
Boiler Aquastat
24V
120VAC VA
40
FACTORY CALIBRATION
TRIMPOTS FOR
DO NOT USE
210
MAX TEMP
OR X-X
FROM
T STAT
POWER ON
O
DATA PORT
FROM ARM
1.5
RESET RATIO
W
C
1
0.5 150
0.7
0.6
0.8
1.0
180
24VAC
COMMON
TO T-T
BOILER
DIFF
5
REG 2
REG 1
15
10
ON
PRIORITY
OUTDOOR RESET CONTROL
DPM-2
OUTDOOR
SENSOR
WATER
SENSOR
PRIORITY
INPUT
CIRC
L1 (HOT)
N
ZONE 2
24 VAC
X2
END SW 2END SW 1
X1 X1 X2
COM
ZONE 1
1 2 3 4 1 2
T
ON
X-X
T T
Zone Valve Controller
AZ-3
ZONE 3
43 1 2 43
T T T
RESET ON
TYPICAL WIRING APPLICATION USING DPM-2
OUTDOOR RESET WITH ARGO AZ-3 ZONE VALVE CONTROL
7
PN 240005132 Rev. D [11/15/2021]

INSTALLATION MANUAL AND OPERATING INSTRUCTIONS
DPM-2 OUTDOOR TEMPERATURE SETBACK CONTROL
WITH ARGO AZ-4CP CONTROL
AZ-4CP
120VAC
N L
PRIMARY
PUMP
L N
PRIORITY
PUMP
L N
FROM BOILER
ZCZR
N
L
120 VAC
TO XFRM
R
24 VAC
C
X
X
TO DPM-2
X-X CONTACT
ZR ON
PRIORITY PUMP
PRIMARY PUMP
PRIORITY ON
STATUS
ZC ON
PRI ZONE 1
1 2 ZONE 4
43 1 3
ZONE 2
2 4 ZONE 3
1 2 3 4 21 3 4
OPTION SWITCHES
ZR-ZC
DPM-2
ZONE VALVE / PUMP
PRIORITY
Z1 Z2 Z3 Z4
TT T T T T T T
NOTE:
REFER TO AZ-CP MANUAL
FOR AZ-CP OPERATION
ON
OFF
KEY
ON
OPTION SWITCHES
ZONE VALVE / PUMP
ZR-ZC
DPM-2
PRIORITY
WATER
SENSOR
}
INPUT
PRIORITY
DO NOT USE
SENSOR
OUTDOOR
SENSOR
OUTDOOR
SENSOR
WATER
DPM-2
ON
PRIORITY
TRIMPOTS FOR
(DO NOT USE)
FACTORY CALIBRATION
OUTDOOR RESET CONTROL
DPM-2
DO NOT USE
}
RIBBON CABLE
RED WIRE
MAD
1
RESET RATIO
0.5 1.5
0.7
0.6
0.8
1.0
BOILER
OR X-X
TO T-T
T STAT
24VAC
COMMON
POWER ON
RESET ON
MAX TEMP
150 210
DIFFERENTIAL
5 15
180 10
AZ-4CP
8
PN 240005132 Rev. D [11/15/2021]

INSTALLATION MANUAL AND OPERATING INSTRUCTIONS
DPM-2 OUTDOOR TEMPERATURE SETBACK CONTROL
WITH ARGO ARM-4P CONTROL
9
PN 240005132 Rev. D [11/15/2021]

INSTALLATION MANUAL AND OPERATING INSTRUCTIONS
Sequence of Operation
DPM-2 is designed to operate in conjunction with several
Argo controls via a ribbon cable but may also be used with
other manufacturers’ controls� The following assumes the
application is a ribbon cable to standard zone control�
1.
Zone control and boiler should be functioning properly
in all respects prior to evaluating the DPM-2� Remove
the ribbon cable and verify proper system operation
before continuing�
2.
Connect the DPM-2 to the zone control using the
supplied ribbon cable in accordance with the wire
diagram for your specic application (See Section VIII
of this manual for examples�)
3.
With the DPM-2 “Power On” switch in the “On” position,
there should be 24 VAC across the lower terminals
labeled “24 VAC and Common.”
4.
The high limit control on the boiler should be set to a
higher temperature than the “Max. Temp.” setting on
the DPM-2. (See Section VII for more information.)
5.
The “Priority On” LED should be on when the “Priority
Zone” terminals on the zone control are jumped.
The small relay near the LED should also be heard
energizing�
6.
When the DPM-2 “Reset On” LED is illuminated, the
X-X relay on the zone control should be o. When the
“Reset On” LED is o, the X-X relay should be on only
if a zone is calling for heat�
RTD Sensor Troubleshooting
To conrm RTD Sensor is functioning properly:
1.
Remove both RTD leads from the terminal block on the
control board�
2.
Use a multimeter to take an ohm reading across the
RTD leads� A properly functioning RTD Sensor will
produce a reading of approximately 1005 ohms at 70°F
while a faulty RTD will read either “0” or “1.”
3.
Replace RTD if necessary�
Troubleshooting Tips
1.
If the setup check is okay, a problem may be due to a
faulty sensor, faulty installation, or faulty wiring�
2.
Disconnect the sensor wires from the DPM-2 terminals
and measure the resistance between the wires� The
measured resistance should be within 5% of the values
in the table below� If the meter indicates an open or
short you might suspect the wiring between the sensor
and the DPM-2�
3.
If the outdoor sensor disagrees with another outdoor
thermometer, it may be located in direct sunlight�
Reposition the sensor if necessary� Do not proceed
until both sensors are performing properly�
EXAMPLE: If the water sensor reads 1500 ohms and you
estimate the water is about 175°F, the water sensor is
okay. If the meter reads 1400 ohms or 155°F, you might
suspect the thermal connection between sensor and the
pipe.
OUTDOOR SENSOR WATER SUPPLY SENSOR
Degrees Ohms Degrees Ohms
5 758 149 1368
14 789 158 1413
23 822 167 1459
32 855 176 1506
41 889 185 1554
50 924 194 1602
59 960 203 1652
68 997 212 1702
77 1035 - -
NOTE: The Outdoor Sensor and Water Supply Sensor
are interchangeable and may be reversed to assist the
troubleshooting process.
10
PN 240005132 Rev. D [11/15/2021]

INSTALLATION MANUAL AND OPERATING INSTRUCTIONS
REPLACEMENT PARTS
DESCRIPTION PART NUMBER
Temperature Sensor Z63
Outdoor Sensor Shield S60
Replacement Parts
11
PN 240005132 Rev. D [11/15/2021]

For technical support on this and all Argo products,
please contact ECR International Technical Service at
1-800-325-5479. Please have your model number
available when calling.
Information Needed When Calling
Model Number
Installation Date
Installer
INSTALLATION MANUAL AND OPERATING INSTRUCTIONS
Technical Support
All specications subject to change without notice.
©2021 ECR International, Inc.
2201 Dwyer Avenue, Utica, NY 13501
Tel. 800 325-5479
www.ecrinternational.com
Table of contents