Tjernlund DCOP1 Constant Operating Pressure Draft Control 8504174 (Discontinued) - Manual (Page 2)

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TABLE OF CONTENTS
Page (s)
Description and General Information ...............................................................................................................................1
Installation Restrictions and Cautions ........................................................................................................................1, 2
UC1 Universal Control Board Features ..........................................................................................................................2
UC1 LED Status / Fault Indicators and Fault Retrieval from Memory .............................................................................3
UC1 Pre / Post-Purge & Pre-Cycle Prover Status Check Settings..............................................................................3, 4
DCOP1 Installation .........................................................................................................................................................4
Sizing a Common Manifold Serving Multiple Heaters ....................................................................................................5
Electrical Wiring
Wiring Connections between DCOP1 and Rooftop Inducer ............................................................................6
UC1 Internal Schematic, Sequence of Operation & Specifications ..............................................................7, 8
UC1 Multiple and Millivolt Appliance interlocks ................................................................................................8
UC1 Wiring to Gas Fired Appliance ............................................................................................................9-11
UC1 Wiring to Oil Fired Equipment ...........................................................................................................11-13
How the Draft COP Works ............................................................................................................................................14
Vent Pipe Sensing Location & PSA-1 Fan Prover Installation.......................................................................................14
Adjusting Draft Set Point & Balancing Heater Draft ......................................................................................................14
Verifying System Operation ..........................................................................................................................................15
Adjustment of Draft Set Point, Balancing Baffles and Barometric Draft Controls .........................................................16
Final Operation and Draft Check ...................................................................................................................................16
Troubleshooting, Service and Warranty ...................................................................................................................16-19
DESCRIPTION
The DCOP1 combines Tjernlund's standard UC1 interlock control with the (COP) Constant Operating Pressure controller.
It can be interlocked with virtually any burner control circuit. Features include: adjustable pre & post purge, LED status/diagnostic
indicators, 10 second prover switch delay to avoid burner start up and wind induced short cycling. Interlocks with any 24-115 VAC
burner control circuit and also includes "dry" contact actuation option. After each burner cycle the UC1 will continue to operate in
post-purge mode to allow the Inducer to purge the heater and vent of residual flue gases. A pre-purge time is factory set at 5 sec-
onds (adjustable up to 35 seconds) and a post-purge time is factory set at 2 minutes (adjustable up to 16 minutes), see "Pre / Post
Purge Settings" on page 3.
The COP controller measures draft/pressure and modulates the speed of an RT-Series Inducer to maintain a user adjustable
draft/pressure set point. Do not use with any other series of Tjernlund Inducers/Venters. The set point is adjusted through a pot
mounted on the COP circuit board.
GENERAL INFORMATION
Each DCOP1 is electrically factory line tested before shipment.
After opening carton, inspect thoroughly for hidden damage. If any damage is found notify freight carrier and your distributor
immediately and file a concealed damage claim.
INSTALLATION RESTRICTIONS
1. The Pre-Cycle Prover Status Check is deactivated from the factory. When activated, the UC1 Universal Control checks across
P1 & P2 safety circuit (Fan Prover) to verify that the Fan Prover switch is “Open” upon a call for heat and not stuck “Closed”.
Natural draft or winds may be sufficient to close the PSA-1 fan prover switch contacts prior to a call for heat. Keeping the Prover
Status Check activated may cause nuisance lockouts. Push up or “ON” to deactivate. See "P1 & P2 Pre-Cycle Fan Prover
Status Check", page 4 for details.
2. An Inducer post-purge on the UC1 has been factory set at 2 minutes. Confirm that dip switch #5 is in the up or "ON" position. Oil
fired equipment requires that the post-purge be long enough to eliminate post cycle nozzle drip odor. A longer post-purge may
be necessary for longer vent runs or high heat retention, refractory lined combustion chambers. A shorter post-purge may be
desired for gas installations. See "Pre / Post Purge and Prover Status Check Dip Switch Settings", page 3 for details.
3. The DCOP1 is intended for indoor installation only. Do not mount the DCOP1 on a heat source that exceeds 140 O F (60 O C).
Examples of improper mounting surfaces include vent pipe, top of heater casing or any place where radiant or convective heat
would cause the junction box temperature to exceed 140
O F (60 O C).
4. The maximum distance wire can be ran from the RT-Series Inducer junction box to the DCOP1 control is 250 feet.
CAUTIONS
The DCOP1 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 appropriate National Fire Protection Association #31, #54, #211 and the
National Electrical Code.