Tjernlund WHKE Millivolt Interlock Kit (Compatible with UC1 Control) 8504108 Rev 08/02 User Manual
Page 3
UC1 UNIVERSAL CONTROL, MAC1E OR MAC4E AND WHKE INTERLOCK KIT
CONNECTED WITH A MILLIVOLT APPLIANCE
XN
R
UNI
V
E
R
S
A
L CO
NT
RO
LLE
R
D/N 9183046-9
CALL
AS APPLIANCE INTERLOCK VOLTAGE.
RED JUMPER POSITION MUST BE THE SAME
XL
J1
J2
DRY
115V
24V
IMPORTANT:
JUMPER
GENERATED
5 VDC
LEGEND:
115 VAC
WHKE GAS
SAFETY CIRCUIT ACROSS P1 & P2 OF UC1 IS NOT UTILIZED
WITH HEATING EQUIPMENT AS SHOWN.
IN THIS APPLICATION. SPILL SWITCH MUST BE INTERLOCKED
MILLIVOLT
PRESSURE
SWITCH
JUNCTION ADAPTER
THERMOCOUPLE
950-0470 (JA1)
LINEAR LIMIT
SPILL SWITCH
GAS
VALVE
30 MILLIVOLT WATER HEATERS REQUIRE USE OF THE
(ECO) OF WATER HEATER. LINEAR LIMIT SPILL SWITCH,
ON 750 MILLIVOLT (POWER PILE) WATER HEATERS WIRE
LINEAR LIMIT SPILL SWITCH IN SERIES WITH HIGH LIMIT
950-0470 THERMOCOUPLE JUNCTION ADAPTER.
950-0470 JUNCTION ADAPTER AND GAS PRESSURE
SWITCH ARE INCLUDED WITH WHKE KIT.
DO NOT
SUPPLY
POWER.
POWER!
BOARD-
50/60 Hz
SUPPLY
115 VAC
ELECTRICAL BOX.
GROUND
CRIMP GROUND WIRE TO GROUNDING SPADE TERMINAL IN
IMPORTANT:
CONNECTIONS WITH UC1, MAC1E OR MAC4E
Each millivolt appliance interlocked with the UC1, MAC1E or MAC4E must have its own WHKE kit installed. The WHKE Gas Pressure
Switch actuates the Venter through the A - B Dry contacts. The Linear Limit switch disables the heater in the event of a venting malfunc-
tion. IMPORTANT: Each millivolt appliance interlocked with the UC1, MAC1E or MAC4E must have its own Linear Limit spill switch.
1. Wire WHKE Gas Pressure Switch across A and B terminals on UC1, MAC1E or MAC4E. Do not supply voltage to A and B terminals.
2. Wire WHKE Linear Limit in series with thermocouple junction adapter or high limit ECO of heater.
3. Make sure RED voltage jumper on UC1, MAC1E or MAC4E is in the DRY position.
4. If not previously completed, connect 115 VAC supply voltage to L & N terminals on UC1. Crimp Ground wire to grounding spade
terminal in UC1. Important: Installer must supply overload and disconnect protection.
5. If not previously completed, connect ground from UC1 whip to Venter ground. Connect Black and White leads from UC1 whip
to Venter motor leads. Connect Blue and Yellow leads from UC1 whip to Venter Fan Prover switch. Prover Leads are not polarity
sensitive. If using a Draft Inducer and only venting millivolt appliances the PS1505 Fan Proving Switch is not necessary, see below
for further information.
DRAFT INDUCERS WITH ONLY MILLIVOLT APPLIANCES (PS1505 FAN PROVER NOT REQUIRED)
When venting only millivolt gas control(s) with a draft inducer, the PS1505 fan prover is not necessary. It will, however, be necessary to
"jumper" the P1 and P2 terminals on the UC1 Universal Control. Remove the call jumper across J1 and J2 and place it across P1 and
P2 on the UC1. Deactivate the Prover Status Check circuit by pushing the #9 dip switch up, or to the "deactivated" position in the UC1
Universal Control. See “Prover Status Check Dip Switch Settings” in the Venter or UC1 instruction manual. The P1 & P2 proving switch
circuit of the UC1 cannot control the burner operation of a millivolt gas control. When using a WHKE millivolt interlock kit, the appliance
safety shutdown is accomplished by the Linear Limit spill switch which detects flue gas spillage. WARNING: The P1 & P2 proving
switch circuit must only be jumpered when venting strictly millivolt appliances where the safety is provided by the Linear Limit.
HS-SERIES POWER VENTERS WITH ONLY MILLIVOLT APPLIANCES (FAN PROVING SWITCH PROVIDED)
When venting only millivolt gas control(s) with an HS-Series power venter connect Fan Prover leads as outlined above in step 5. The fan
prover will not control the millivolt gas valve, but its inclusion is beneficial to proper sequencing of the UC1 control.
MULTIPLE APPLIANCE INTERLOCKS WITH A MILLIVOLT AND A 24 -115 VAC CONTROLLED APPLIANCE
When using a WHKE millivolt interlock kit the millivolt appliance safety shutdown is accomplished by the Linear Limit spill switch which
detects flue gas spillage. The P1 & P2 proving switch circuit of the UC1 Universal Control cannot control the burner operation of a milli-
volt gas control. When co-venting a 24-115 VAC gas control with a millivolt gas valve (i.e. furnace and water heater combo) the P1 &
P2 proving switch circuit only interlocks the 24-115 VAC gas control. The millivolt appliance safety shutdown is accomplished by the
Linear Limit spill switch which detects flue gas spillage. WARNING: Do not jumper the P1 & P2 proving switch circuit when
co-venting millivolt and 24 - 115 VAC gas valves.