Tjernlund 950-1067 Relay-Timer Airotronics - Adjustable 8504053 Rev. A 04/12 User Manual
Page 2
PART # 950-1067 INSTALLATION INSTRUCTIONS
24/120 VAC INPUT ADJUSTABLE POST-PURGE TIMER/RELAY
COMPONENT #
DESCRIPTION
REPLACEMENT KIT #
860-0345
24 VAC Input Post-Purge Timer/Relay
950-1067
860-0346
120 VAC Input Post-Purge Timer/Relay
950-1067
860-0349
24/120 VAC Input Post-Purge Timer/Relay
950-1067
NOTE: The Tjernlund Timer/Relay Part # 950-1067 is used both as a replacement part and can also be used as an accessory with
Tjernlund Draft Inducers, although the UC1 Universal Interlock Control is the preferred accessory for interlocking and controlling Draft
Inducers. The Timer/Relay has an adjustable post-purge period of (10 seconds to 10 minutes).
A) Disconnect 120 VAC Power to the Power Venter/Draft Inducer and any thermosat / aquastat call for heat before continuing.
B) All wiring from the Power Venter/Draft Inducer to the appliance must be appropriate class 1 wiring as follows: installed in rigid-
metal conduit, intermediate metal conduit, rigid non-metallic conduit, electrical metallic tubing, Type MI Cable, Type MC Cable
or be otherwise suitably protected from physical damage.
POST-PURGE ADJUSTMENT (10 SECOND TO 10 MINUTE)
To reduce the post-purge cycle turn the adjustment pot counter-clockwise. To increase the post-purge cycle turn the adjustment pot
clockwise. Nominal adjustment range is 10 seconds to 10 minutes. NOTE: Do not overturn adjustment on Timer/Relay. This will dam-
age Timer/Relay and void warranty
IMPORTANT: Run heating equipment through a few cycles to verify post-purge is adequate. Venter should shut off (10 seconds to
10 minutes) after call for heat is removed and post-purge cycle is complete. Oil fired equipment requires a post-purge 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.
120 VAC SUPPLY AND OUTPUT TO MOTOR WIRING
The output or motor switching side of the # 950-1067 has three terminals. L1 or
the 120 VAC supply power lead is attached to terminal 2. White or the 120 VAC
neutral lead is attached to terminal 3 and the Black or 120 VAC “hot” motor lead
is attached to terminal 1. IMPORTANT: Terminals 2 (L1) and 3 (L2) must be
powered continuously with 120 VAC.
ELECTRICAL RATING
The Terminal 1 (Motor Load) and Terminal 3 (L2) 120 VAC Load contacts are
rated for 1/4 H.P. @ 120 VAC.
REPLACEMENT OF DEFECTIVE TIMER/RELAY
1. Remove the electrical box cover of the Power Venter.
2. Mark the Black wire on defective Timer which is the load wire to the motor. This terminal will be marked BLK MOTOR, LOAD or be
the #1 Terminal if replacing an Airotronics Timer. Remove the defective Timer and (4) plastic stand offs if necessary.
3. Place the 120 VAC supply L1 Black wire on Terminal 2. Place the White L2 wire on Terminal 3 and place the Black Motor Load
wire on Terminal 1, (See Diagram A).
WIRING
The # 950-1067 Timer/Relay may be used to replace either the 24 VAC input # 950-1060 or the 120 VAC input # 950-1065
Timer/Relays. The # 950-1067 is designed to accept either 24 VAC or 120 VAC control input signals on terminals 4 & 5. The control
inputs are non-polarity sensitive.
The output or motor switching side of the # 950-1067 has three terminals. Viewing the Timer/Relay as shown in Diagram A, L1 or
the “hot” power lead is attached to terminal 2. L2 or the neutral lead is attached to terminal 3 and the Black or “hot” motor lead is
attached to terminal 1. NOTE: In order for the timer to operate after appliance shutdown, terminals 2 and 3 must be powered
continuously with 120 VAC.
The Timer/Relay kit is supplied with quick-connect leads for when it is installed as an accessory control. In most cases it will be easi-
er to use the existing wire leads when installing it as a replacement for a defective Timer/Relay.
1
3
2
5
4
MOTOR (BLACK)
L1 (BLACK)
(WHITE)
L2
LOAD
DIAGRAM 1 TIMER/RELAY OUTPUT
50/60 HZ
120 VAC
DIAGRAM A
1/4 H.P. @ 120 VAC