Document No. 125-1902
User Guide
June 26, 2018
Page 2 of 16 Siemens Industry, Inc.
Basic Economizer Control Modes
1. Control Mode 1: Fixed Dry-bulb
(Single dry-bulb)
Outside air and mixed air temperature sensors
are used.
2. Control Mode 2: Differential Dry-bulb
(Dual Dry-Bulbs)
Outside air, return air, and mixed air
temperature sensors are used.
3. Control Mode 3: Combination Fixed Enthalpy
and Fixed Dry-bulb Control
Outside air temperature and humidity sensors,
and mixed air temperature sensors are used.
4. Control Mode 4: Combination of Differential
Enthalpy and Fixed Dry-bulb
Outside air temperature and humidity sensors,
return air temperature and humidity sensors,
and mixed air temperature sensors are used.
Specifications
Electrical Ratings:
Input Voltage: 24 Vac ±25%; 50/60 Hz (Class 2).
Nominal Power Consumption (at 24 Vac, 60 Hz):
4 VA.
Relay Contact Rating at 30 Vac (maximum power
from Class 2 input only): 1.5A run, 3.5A inrush.
NOTE:
All inputs and outputs must be 24 Vac Class 2.
Ambient Ratings:
Temperature: -40°F to 149°F (-40°C to 65°C).
Humidity: 5 to 95 percent RH (non-condensing).
Inputs:
Combination Temperature/Humidity Sensor
(QFM2160U): 5-wire (18, 20, or 22 AWG cable)
connection.
Dry Bulb Temperature Sensor 10K Ohm Type II
NTC (QAM2030.010) or 3K NTC: 2-wire
(18, 20, or 22 AWG cable) connection.
DCV (CO
2
) Sensor (QPA2000): 3- wire
(18, 20, or 22 AWG cable)
0 to 10 Vdc control signal
Outputs:
Actuator (GCA151.1P GMA151.1P, GQD151.1P):
4-wire (18 AWG)
Actuator Signal: 2 to 10 Vdc.
Actuator Input Resistance: 100K ohm.
The controller provides 7 VA max. to operate the
damper actuator.
Exhaust Fan: Contact closure.
Auxiliary Equipment:
• RDY2000 Commercial Thermostat
• LVC2 (135 Ω) Control Board for remote minimum
damper positioning (POL220.10 and POL220.15)
• BSG61 (0-10 Vdc) for remote minimum damper
positioning (POL220.00 and POL220.05)
Wire the electrical connections using 1/4” female,
insulated spade connections.
Approvals:
UL listed per UL873.
CE
RCM
cUL Listed per CSA – C22.2 No. 24
Suitable for plenum installation
UL/NEMA Type 1
Dimensions: 5.10” × 4.70” × 1.10”
(130 mm × 120 mm × 28 mm)
Weight: 0.49 lbs (221 g)
Required Tool
Phillips Screwdriver
Expected Installation Time
15 minutes
Installation
Mount the controller to sheet metal ductwork or a
panel using two self-tapping screws (provided). The
mounting location must protect the controller from
the elements and ultraviolet rays.
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