Install Instructions

4
UCRT INSTALLATION
Do not mount the UCRT junction box 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. 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 nec-
essary, 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 TERMINAL 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 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 WEATHER-
PROOF BOX
SPEED CONTROL
RED LEAD
TO INDUCER
6 AMPS MAXIMUM @ 120 VAC 50/60 HZ.