6
INDUCER GROUND, MOTOR AND PROVER SAFETY CIRCUIT CONNECTIONS
ROOFTOP INDUCER PSA-1 FAN PROVER CONNECTIONS
The Blue and Yellow leads from UC1 (P1 and P2) safety circuit must be connected to the PSA-1 Fan Prover switch. Leads are not
polarity sensitive. When venting
only
millivolt appliances, the PSA-1 Fan Prover is not needed. See WHKE manual or consult factory.
1
ROOFTOP INDUCER MOTOR AND COOLING FAN CONNECTIONS
Connect Black and Red leads from UCRT to like colors in Rooftop Inducer whip 4x4 weatherproof junction box. Connect White
wire from UCRT to White & White/Red Sriped wire in Rooftop Inducer whip 4x4 weatherproof junction box.
UCRT / ROOFTOP INDUCER GROUND CONNECTIONS
Connect the two Green ground leads within the UCRT to the ground of the power supply service panel. Connect the
Green/Yellow Striped lead to the Green ground screw within the Rooftop Inducer whip 4x4 weatherproof junction box.
MULTIPLE APPLIANCE INTERLOCKS
To interlock with one additional 24/115 VAC heater add the MAC1E. It is a stripped down auxiliary board version of the UC1 and
is powered by and communicates with the UC1 through a factory wired whip.
To interlock more than two 24/115 VAC heaters, add the MAC4E for a total of up to 5 heaters. It is powered by and communicates
with the UC1 through a factory wired whip. Consult factory for installations with more than 5 heaters.
To interlock a millivolt water heater and a 24/115 VAC furnace or boiler, add the WHKE and MAC1E.
MILLIVOLT HEATER INSTALLATIONS
Each millivolt appliance interlocked with the UC1 must have its own WHKE kit installed. The WHKE Gas Pressure Switch actuates
the Inducer through the A - B Dry contacts. The Linear Limit switch disables the heater in the event of a venting malfunction.
IMPORTANT
: Each millivolt appliance interlocked with the UC1 must have its own Linear Limit spill switch.
MULTIPLE MILLIVOLT HEATER INSTALLATIONS
Multiple millivolt heaters can be installed by using the A-B dry contact terminals of the UC1, MAC1E or MAC4E. Wire each WHKE
gas pressure switch in parallel across A-B terminals of UC1, MAC1E or MAC4E. Wire Linear Limit safety switch into each individ-
ual millivolt heater. For further information consult factory or WHKE instructions.
FIGURE 8052075 5-19-11
MOTOR
CAPACITOR
GROUND
BLACK
RED
BROWN
WHITE / RED
COOLING FAN
THERMOSTAT
INDUCER
MOTOR
THERMOSTAT
WHT
/ RE
D
BL
AC
K
BR
OW
N
OR
AN
GE
BR
OW
N
RE
D
NUT
S
OR
AN
GE
BL
AC
K
RE
D
WHT
/ RE
D
WHI
TE
WHI
TE
BLUE
BLUE
BLACK
4 FT. WHIP
PRE-WIRED
INCLUDED 4 X 4 BOX
IMPELLER
WI
RE
BLACK
INCLUDED
ORANGE
SIDE VIEW
CUTAWAY
RT SERIES
WHITE
OFF
SPEED
CONTROL
CONTROL OPTION 4
HEATING APPLIANCE INTERLOCK USING UCRT
ON
LOW
ON
HIGH
(BLACK)
(WHITE)
L1
N
115 VAC
RED
BLACK
GND
N
L
N
M
MTR
P2
P1
CONTROL
TJERNLUND UCRT
INTERLOCK OPTIONS
INSTRUCTIONS FOR
SEE UCRT
PSA-1
TJERNLUND
WHITE
XN
XL
5 VDC BOARD-GENERATED POWER.
115 VAC
LEGEND
DO NOT SUPPLY POWER!
RED
YELLOW
BLUE
6 AMPS MAX
GREEN/YELLOW
GREEN
GREEN
GND
