Tjernlund VP-2F, VP-3F Airotronics Timer 8504140 Rev A 11/11 - Manual (Page 5)

4
7. Use the 1/4" tubing to connect gas pressure switch fitting to the PRESSURE TAP PORT fitting on the thermostat/gas control valve.
8. Conduct a gas leakage test of all connections as outlined in the latest edition of NFPA 54, ANSI Z223.1, part 4. or local codes.
NOTE: A "gauge pressure tap port" can be accessed by removing the 1/8-NPT pipe plug that is on the 1/8-NPT black pipe tee
(attached to the gas pressure switch).
VE
NT HOOD TERMINATION CLEA
LINEAR LIMIT SPILLAGE SENSING SWITCH INSTALLATION
PURPOSE:
To provide a means for appliance shut-down in the event of flue
blockage or Power Venter failure.
OPERATION:
When concentrated spillage of the products of combustion
occurs from the draft hood, the Linear Limit sensing switch
circuit will open preventing burner operation.
1. Attach the Linear Limit sensing switch mounting bracket to the
top of the water heater using the sheet metal screws provid-
ed. The Linear Limit bracket should be approximately 1/2”
from the draft hood.
2. Attach the three Linear Limit capillary mounting brackets
around the draft hood, equally spaced.
3. Insert the Linear Limit spillage sensing switch capillary into
the “U” of the Linear Limit brackets outlining the perimeter of
the draft hood. The Linear Limit capillary may be overlapped
if necessary, (See Diagram B). IMPORTANT: DO NOT CUT
THE CAPILLARY, it will be destroyed and water heater will be disabled.
4. Route the Linear Limit spillage sensing switch cable down the water heater
casing locating the end near the Thermocouple or ECO of water heater.
Secure it with the cable clamps and self drilling screws provided, (See
Diagram B1).
DIAGRAM B
DO NOT ALTER
GAS SUPPLY
INTO PRESSURE TAP PORT.
GAS PRESSURE SWITCH
GAS CONTROL VALVE
THERMOSTAT/
PILOT GAS LINE
8050011 11/30/11
INSTALL BRASS 1/8-NPT MALE
x 1/4" COMPRESSION FITTING
THERMOCOUPLE
BURNER GAS LINE
COMMON
MUST BE MOUNTED VERTICALLY.
GAS PRESSURE SWITCH DIAPHRAGM
IMPORTANT:
BRASS 1/8-NPT MALE x 1/4"
COMPRESSION FITTING
THERMOSTAT / GAS CONTROL
TO PRESSURE TAP FITTING OF
1/4" OUTSIDE DIAMETER
ALUMINUM TUBING - CONNECT
VALVE.
1/8-NPT BLACK PIPE TEE
1/8-NPT PIPE PLUG - NEW
PRESSURE TAP PORT NORMALLY OPEN
MOUNTING HOLES
IMPORTANT:
A R
H O
T
W
A
M V
C
A
T
I
O
N
GAS
VALVE
DIAGRAM A
DIAGRAM B1