Tjernlund UCRT User Manual
Copyright © 2011, Tjernlund Products, Inc. All rights reserved P/N 8504162
OWNER INSTRUCTIONS, DO NOT DESTROY
Recognize this symbol as an indication of important Safety Information!
THESE INSTRUCTIONS ARE INTENDED AS AN AID TO QUALIFIED, LICENSED
SERVICE PERSONNEL FOR PROPER INSTALLATION, ADJUSTMENT AND
OPERATION OF THIS PRODUCT. READ THESE INSTRUCTIONS THOROUGHLY
BEFORE ATTEMPTING INSTALLATION OR OPERATION. FAILURE TO FOLLOW
THESE INSTRUCTIONS MAY RESULT IN IMPROPER INSTALLATION, ADJUSTMENT, SERVICE OR MAINTENANCE POSSIBLY RESULTING IN FIRE, ELECTRICAL SHOCK, CARBON MONOXIDE POISONING, EXPLOSION, PERSONAL
INJURY OR PROPERTY DAMAGE.
!
DO NOT DESTROY. PLEASE READ CAREFULLY AND
KEEP IN A SAFE PLACE FOR FUTURE REFERENCE.
MODEL UCRT (UC1 with speed control)
INSTALLATION INSTRUCTIONS
REV. A 5/11
TJERNLUND PRODUCTS, INC.
1601 Ninth Street • White Bear Lake, MN 55110-6794
PHONE (800) 255-4208 • (651) 426-2993 • FAX (651) 426-9547
Visit our web site • www.tjernlund.com
UC1 VERSION
X.06
THE UCRT CONTROL IS ONLY SUITABLE FOR USE WITH
TJERNLUND RT SERIES ROOFTOP DRAFT INDUCERS
1
TABLE OF CONTENTS
Page (s)
Description and General Information...............................................................................................................................1
Installation Restrictions and Cautions ........................................................................................................................1, 2
UC1 Universal Control Board Features ..........................................................................................................................2
LED Status / Fault Indicators and Fault Retrieval from Memory .................................................................................2, 3
Pre / Post-Purge & Pre-Cycle Prover Status Check Settings......................................................................................3, 4
UCRT Installation ...........................................................................................................................................................4
Electrical Wiring
Specifications, Warnings, Sequence of Operation & Internal Schematic .....................................................4, 5
Inducer Ground, Motor and Prover Safety Circuit Connections .......................................................................6
Multiple and Millivolt Appliance interlocks ........................................................................................................6
Wiring to Gas Fired Appliance ......................................................................................................................7-9
Wiring to Oil Fired Equipment .....................................................................................................................9-11
PSA-1 Fan Proving Switch Adjustment ........................................................................................................................12
UC1 Operational Check ................................................................................................................................................13
Troubleshooting Electrical Problems........................................................................................................................13-15
Warranty & Replacement Parts.....................................................................................................................................15
DESCRIPTION
The UCRT combines Tjernlund’s UC1 burner interlock control with an Inducer speed control. It is designed for use ONLY with
Tjernlund RT-Series Rooftop Inducers. Follow these instructions through page 11 for information, options and wiring for the UC1.
Follow PSA-1 proving switch adjustment procedures on page 12 or within the RT-Series Rooftop Inducer Installation Instructions.
The UC1 interlock control 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 factory
post-purge time is set at 2 minutes and is adjustable up to 16 minutes, see “Pre / Post Purge and Prover Status Check Dip Switch
Settings” on page 3.
GENERAL INFORMATION
Each UC1 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 on the UCRT. Natural chimney draft may be sufficient to
close the PSA-1 Fan Prover contacts prior to a call for heat which may cause nuisance lockouts. The Pre-Cycle Prover Status
dip switch #9 should be up or “ON” so that it is deactivated. See 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 Dip Switch Settings” on page 3 for details.
3. The UCRT is intended for indoor installation only. Do not mount the UCRT on a heat source that exceeds 140oF (60oC).
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 140oF (60oC).
CAUTIONS
The UC1 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.
Failure to install, maintain and/or operate the UC1 in accordance with manufacturer's instructions may result in conditions
which can produce bodily injury and property damage.
1. The installer must verify that the BTU/hr. input of the appliance does not exceed the recommended input of the any Inducer
being controlled by the UC1. Refer to the Rooftop Inducer installation instructions for capacities.
2. Disconnect power supply from the UC1 and heating equipment when making wiring connections and servicing the UC1.
Failure to do so may result in personal injury and/or equipment damage. LED #6 (RED) should be off with power removed.
2
3. All installation restrictions and instructions in the Inducer installation instructions must be adhered to when using the UC1.
4. Make certain power source is adequate for the UC1 and Venter requirements. Do not add equipment to a circuit when the total
electrical load is unknown.
UC1 UNIVERSAL CONTROL BOARD FEATURES
# 1. Power supplied by board. Do not supply power to this area or control damage may result.
# 2. Do not supply power to the appliance interlock block with the call selector in the “DRY” position.
Control damage may result if power is supplied.
# 3. Circuit protection must be provided by the installer. 16 Amps is the maximum current allowed for this device at terminal L.
A 15 Amp circuit breaker is recommended.
VETI
I
UC1 LED STATUS & FAULT INDICATORS
LED INDICATOR LIGHTS
LED #1 (Amber) Appliance call for heat.
LED #2 (Blue) Safety circuit through P1 & P2 (Inducer Fan Prover and/or Limit). Indicates Inducer prover is closed
during run cycle. Burner circuit is energized with Interlock Relay contact closure from terminal 3 to 4.
LED #3 (Green) Power switched to Inducer motor from L to MTR & M.
LED #4 (Red) Status / Fault indicator.
LED #5 (Red) Used as a status indicator.
LED #6 (Red) 115 VAC power supplied to board.
APPLIANCE CALL
VOLTAGE SELECTION
Place RED voltage jumper in
proper location based on
appliance call interlock voltage. SEE WARNING # 2.
IMPORTANT
LED 1 (AMBER)
LED 2 (BLUE)
LED 3 (GREEN)
LED 4 (RED)
LED 5 (RED)
LED 6 (RED) POWER LED
DRY
24 V
115 V
APPLIANCE
INTERLOCK
RELAY
INDUCER
MOTOR
RELAY
A B 1 2 3 4 L N
J1 J2 XL XN
P1 P2 C GND F
(1 9)
N M MTR
J1- J2 CALL
JUMPER
Used when the call signal is
used as the “proven” return
signal to the appliance. See
wiring section for details.
L / N - 115 VAC POWER
SUPPLY BLOCK
115 VAC / 50-60 Hz
Circuit protection provided by installer.
SEE WARNING # 3.
MTR & M / N LOAD TERMINALS
FROM INDUCER MOTOR RELAY
Used to drive Inducer Motor.
1 HP MAX LOAD across terminals MTR & M / N.
XL / XN AUXILIARY DEVICE
POWER TERMINALS
115 VAC - Maximum of 0.15 Amps.
Only connect to Tjernlund auxiliary devices.
SEE WARNING # 1.
APPLIANCE INTERLOCK
RELAY
1 HP MAX LOAD across
terminals 3 & 4.
P1 - P2 SAFETY CIRCUIT
TERMINALS
1 mA @ 5VDC.
SEE WARNING # 1.
C, GND, F AUXILIARY DEVICE
COMMUNICATION TERMINALS
2 mA @ 5VDC. For Tjernlund MAC1E or
MAC4E auxiliary devices. SEE WARNING # 1.
DIP SWITCH SETTINGS
Pre-Purge (1-2)
Post-Purge (3-8)
Prover status check (9)
See “Pre / Post Purge &
Prover Status Check Dip
Switch Settings”.
LED STATUS LIGHTS
See “LED Status & Fault
Indicator Section” for details.
APPLIANCE INTERLOCK
TERMINAL BLOCK (A-B, 1-4)
A - B - Dry Contact call. 3 mA @ 5VDC.
SEE WARNING # 1.
1 - 24 or 115 VAC intercepted call.
IMPORTANT: RED voltage jumper must
match intercepted call voltage.
2 - 24V common or 115V Neutral.
3 - Common terminal to appliance relay con-
tacts. IMPORTANT: J1-J2 jumper routes
call voltage at terminal 1 to 3. Remove
J1-J2 jumper if a different voltage source is
provided to terminal 3.
4 - Normally open terminal of appliance relay.
Will be energized from terminal 3 if safety
circuit is “proven”.
INDUCER MOTOR RELAY
1 HP MAX LOAD from
terminals L to MTR & M.
LED STATUS INDICATORS
LED #4 & #5 (Red) Flashing Alternately = Inducer in Pre-purge. (Pre-Purge options 0, 5, 20, 35 seconds)
LED #4 & #5 (Red) Flashing in Unison = Inducer in Post-Purge. (Post-Purge options 0, 30 seconds or 1, 2, 4, 8, 16 minutes)
LED #4 Flashes Continuously* = Fan Prover opened for more than 10 seconds during burner cycle.
(Inducer will run for 10 minutes, attempting to close Fan Prover)
LLED #5 (Red) Flashing Intermittently = With no call for heat, flashes 3 seconds on / 3 seconds off if microcontroller is working properly.
LED FAULT INDICATORS
Fault conditions are indicated by counting the number of times LED #4 (Red) flashes.
LED #4 Flashes 2 Times Fan Prover was in electrically closed position prior to Inducer operation.
LED #4 Flashes 3 Times* Fan Prover does not close within 60 seconds after call for heat.
LED #4 Flashes 4 Times* Fan Prover opened during cycle and did not close within 10 minutes of Inducer operation.
LED #4 Flashes 5 Times* Fan Prover opened for more than 10 seconds during burner cycle but closed within 10 minutes.
* Investigate cause of Fan Prover short cycling such as; firing burner at capacities or temperatures exceeding Inducer limits, excessive vent pipe
runs, high winds, plugged / kinked Fan Prover sensing tube. PSA-1 Fan Prover may be faulty or setpoint may be too high and need adjustment.
CHECKING MEMORY FOR LAST FAULT CODE
IMPORTANT: Prior to accessing the fault code memory, note the settings of the dip switches so that they can be returned to their
original Pre / Post-Purge positions. When power is supplied to the UC1 use caution when moving dip switches.
The last fault code can be retrieved at any time by setting all dip switches 1-8 to the up, or “on” position. The last fault code, or
lack there of, will be indicated by counting the number of times LED 4 flashes. By moving any of the dip switches back to their
original position, the fault code will be cleared. NOTE: The UC1 board must have its 115 VAC power supply present when any of
the (1-8) dip switches are moved back to their original position for the fault code to clear.
PRE / POST PURGE AND PROVER STATUS CHECK DIP SWITCH SETTINGS
Remove power to UC1 and heating equipment when installing, servicing or changing dip switch settings. Failure to do so may result in
personal injury and/or equipment damage. LED #6 (RED) should not be on if 115 VAC supply power is removed from the control.
Pre-purge
Used for longer vent runs to get draft fully established throughout the vent system prior to burner ignition. Also beneficial for negative pressure prone environments. IMPORTANT: Nuisance equipment lockouts may occur if Inducer pre-purge is running in conjunction with and is longer than any equipment timing circuit. Pre-purge settings must be shorter than burner control lockout time
unless wired prior to burner control timing circuit (i.e. aquastat / thermostat).
Post-purge
An Inducer post-purge 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.
IMPORTANT: Fault codes will automatically be displayed after a fault condition occurs. If the call for heat interlock signal
or 115 VAC power is removed, the UC1 board will reset and the fault will be stored in memory instead of displayed. Any
new fault will replace any previous fault.
3
Pre-Purge
Post-Purge
Pre-Cycle
Prover Status
Check Deactivated
DIP SWITCH NUMBERING
1
ON
2
3
4
5
6
7
8 9
POST-PURGE SETTINGS (SEE “POST-PURGE” ABOVE PRIOR TO SETTING)
4348657 35678 345678 3 75468
4348657 35678 345678
4 Minutes 8 Minutes 16 Minutes
1 Minute0 Seconds 30 Seconds 2 Minutes
ON
ON
1 9
LED 1 AMBER
LED 2 BLUE
LED 3 GREEN
LED 4 RED
LED 5 RED
LED 6 RED
POWER LED
ON
4
UCRT INSTALLATION
Do not mount the UCRT junction box on a heat source that exceeds
140oF (60oC). 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 140oF. The UCRT
is intended for indoor installation only.
Using the key hole slots on the back of the UCRT junction box as a
template, mark 4 holes on the mounting surface, drill pilot holes if necessary, and secure junction box using provided screws.
The Rooftop Inducer includes a 4’ whip and weatherproof junction box.
The PSA-1 must be mounted with the diaphragm in a vertical position.
See Rooftop Inducer instructions for complete installation details.
ELECTRICAL WIRING
FIGURE 8050021
UC1
RT SERIES
UC1 or UCRT
PSA-1
2 WIRE +
GROUND
INSTALLER-SUPPLIED
BURNER INTERLOCK
INSTALLER-SUPPLIED
115 VAC CONNECTION
CONNECTION
T
O
R
O
O
F
T
O
P
U
N
I
T
3
W
I
R
E
+
G
R
O
U
N
D
POWER
REQUIREMENTS
EXTERNAL
POWER SWITCHING
CAPACITY
J1 / J2
JUMPER
SAFETY
CIRCUIT
ADD VENTER MOTOR
LOAD PLUS 1/2 AMP
FOR UC1 LOAD
EXTERNAL
CALL TRIGGER
METHODS
J1 / J2
P1 / P2
L / N
3 TO 4
T-BLOCK
T-BLOCK
(RELAY K1)
XL / XN
UC1 CONTROL
M & MTR
(RELAY K2)
T-BLOCK
A / B
24V
1 / 2
115V
1 / 2
OR
OR
USED TO JUMP CALL HOT (24 VAC) OR CALL LINE (115 VAC) FROM TERMINAL 1 TO TERMI N AL 3.
CONNECTED TO FAN PROVER.
1 mA @ 5 VDC. DO NOT SUPPLY POWER HERE.
REMOVE J1-J2 JUMPER IF A DIFFERENT VOLTAGE SOURCE IS PROVIDED TO TERMINAL 3.
120 VAC ±10 %, 50/60 Hz
MOTOR - 1 H.P. MAX. @ 120 VAC, 50/60 Hz
USER-PROVIDED 24 VAC AT TERMINALS 1 & 2. 1 = CALL HOT, 2 = COMMON. CONTROL
REQUIRES 5 mA @ 24 VAC TO TRIGGER. MOVE RED VOLTAGE JUMPER TO "24V" LOCATION.
3 mA @ 5 VDC. MOVE RED VOLTAGE JUMPER TO "DRY" LOCATION. DO NOT SUPPLY POWER.
USER-PROVIDED CONTACT CLOSURE FROM A TO B. SIZE CONTACT CLOSURE TO HANDLE
GENERAL PURPOSE - 15A @ 120 VAC, 50/60 Hz
DURING OPERATION THE CONTROL USES 50 mA MAX @ 120 VAC
MOTOR - 1 H.P. MAX. @ 120 VAC, 50/60 Hz
150 mA MAX @ 120 VAC, 50/60 Hz
CAN ONLY BE CONNECTED TO TJERNLUND-SPECIFIED AUXILIARY DEVICE
CIRCUIT PROTECTION PROVIDED BY INSTALLER
GENERAL PURPOSE - 15A @ 120 VAC, 50/60 Hz
RESISTIVE - 10A @ 28 VDC PILOT DUTY - 470 VA
USER-PROVIDED 115 VAC AT TERMINALS 1 & 2. 1 = CALL LINE, 2 = NEUTRAL. CONTROL
REQUIRES 1 mA @ 115 VAC TO TRIGGER. MOVE RED VOLTAGE JUMPER TO "115V" LOCATION.
D/N 9183006H
ON
PRE-PURGE SETTINGS (SEE “PRE-PURGE” ON PAGE 3 PRIOR TO SETTING)
12 12 12 12
0 Seconds 5 Seconds 20 Seconds 35 Seconds
P1 & P2 PRE-CYCLE FAN PROVER STATUS CHECK
Pre-Cycle
Prover Status
Check Deactivated
9
The Pre-Cycle Prover Status Check is deactivated from the factory on the UCRT. Natural chimney
draft may be sufficient to close the PSA-1 Fan Prover contacts prior to a call for heat which may
cause nuisance lockouts. The Pre-Cycle Prover Status dip switch #9 should be up or “ON” so that
it is deactivated.
ELECTRICAL SPECIFICATIONS
TYPICAL UCRT, PSA-1 FAN PROVER
& ROOFTOP INDUCER INSTALLATION
UCRT
ROOFTOP INDUCER
INCLUDES 4’ WHIP
AND WEATHERPROOF BOX
SPEED CONTROL
RED LEAD
TO INDUCER
6 AMPS MAXIMUM @ 120 VAC 50/60 HZ.
Loading...