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TABLE OF CONTENTS
Page (s)
MPCI Modulating Pressure Control Description ..............................................................................................................1
Installation Restrictions....................................................................................................................................................1
Cautions ..........................................................................................................................................................................1
Sample and Reference Pressure Connections ...............................................................................................................2
Pressure Sensing Tube Locations & Installation..........................................................................................................2-4
Make-up / Combustion Air Pressure Set Point ................................................................................................................5
MPCI Sequence of Operation..........................................................................................................................................5
Wiring .........................................................................................................................................................................5-11
MPCI Operation Confirmation .......................................................................................................................................11
Adjusting Draft and Balancing Draft of Heaters .............................................................................................................12
Changing MPCI Pressure Control Program Defaults ...............................................................................................12-13
Warranty and Replacement Parts ............................................................................................................................13-14
Tjernlund Products welcomes your comments and questions. Address all correspondence to:
Customer Service • Tjernlund Products, Inc. • 1601 Ninth Street • White Bear Lake, MN 55110-6794
Call us toll free at 800-255-4208, visit our web site @ www.tjernlund.com or email us at [email protected].
DESCRIPTION
The MPCI Controller (with integral UC1 burner interlock) is designed to modulate draft, exhaust or supply air so that the pro-
grammed pressure set point is maintained. The model MPCI (with burner interlock) must be installed If used to exhaust or provide
combustion air for fuel burning equipment. Two MPCI Controllers will be needed if controlling both exhaust and supply air.
Interlocked burners will only operate when the pressure set point is obtained and will be disrupted if the pressures fall below the
set point for a timed period.
FOR EXHAUST APPLICATIONS:
Pressure is measured in a chase, duct or vent at the farthest point from the Exhaust Fan. As exhaust volume increases within the
duct/chase/vent the resulting reduction in measured pressure causes the controller to speed the fan up to handle the additional
exhaust volume and slow the fan down when the exhaust volume is reduced to maintain a consistent exhaust pressure.
FOR SUPPLY / MAKE-UP AIR APPLICATIONS:
Pressure is measured within a mechanical room space or duct connected to the outdoor air supply fan. As air is exhausted from
the monitored space the controller modulates the supply air fan speed to maintain the pressure set point air pressure within the
space or duct.
GENERAL INFORMATION
Each MPCI Controller is electrically factory line tested before shipment. After opening carton, inspect thoroughly for hidden dam-
age. If any damage is found notify freight carrier and your distributor immediately and file a concealed damage claim.
INSTALLATION RESTRICTIONS
1.
Do not
use the MPCI with gas or oil fired heating equipment without interlocking all burners being served with the integral UC1
Control and the required number of MAC-Series Multiple Appliance Controls. Follow instructions and wiring diagrams included
and perform “Operation and Interlock Confirmation”check on Page 11 to validate the interlock is operating correctly.
2. The MPCI Controller is intended for indoor installation only. Do not mount on a heat source or in an environment that exceeds
122oF (50oC) or 85% relative humidity.
3. The maximum wire distance from the Control to a VFD or ECM Exhaust Fan Motor is 300 feet. Install the MPCI as close to the
pressure sampling point as possible to avoid delayed response to pressure changes. Do not exceed a sampling tube length of
15 feet (6 feet included with PSA-1 Fan Prover). The default fan acceleration rate may need to be increased for sampling tube
lengths greater than 10 feet.
CAUTIONS
The MPCI controller must be installed by a qualified installer (an individual properly licensed and/or trained) in accordance with all
local codes or, in their absence, in accordance with the National Electrical Code, Uniform Mechanical Code and International Fuel
Gas Code if applicable. Failure to install, maintain and/or operate the MPCI Controller in accordance with manufacturer's instruc-
tions may result in conditions which can produce bodily injury and property damage.
1. Disrupt external supply power to MPCI Controller when making wiring connections and servicing. Failure to do so may result
in personal injury and/or equipment damage.
2. All installation restrictions and instructions specific to the exhaust or supply Fan installation instructions must be followed.
3. Make certain the power source is adequate for the MPCI requirements. Do not add equipment to a circuit when the total
electrical load is unknown.