Lochinvar 000 - 500 Installation & Service Manual page 37

5
Electrical connections
Installation of a Remote Sensor (Boiler Application)
1. Turn OFF the main electrical power and the main manual
gas shutoff to the appliance.
2. Remove the side access panel from the appliance to gain
access to the thermostat.
3. Locate the sensor in the kit. Determine the location of the
remote sensor and measure the amount of wire needed to
connect the sensor to the thermostat. See Wiring of
Remote Sensors on page 36 for guidelines.
4. Use twisted pair wire, minimum 18 gauge or larger. See
Table 5A, page 33 regarding distance versus wire gauge.
Ensure all wire insulation is trimmed to reveal at least 3/8"
of exposed wire.
5. Connect the measured wire to the sensor wire using wire
caps (see FIG. 5-5). Install .250 x .032 insulated female
quick connect terminals to the end of the wires. Feed the
wires through the access hole located on the back of the
unit and secure the connectors to the thermostat
connections (Sys/Tank) CN5 and CN6 located in the
upper right-hand of the thermostat.
6. Turn on the electrical power and the main manual gas
shutoff to the appliance.
7. Replace the side access panel.
8. Fire the appliance and resume operation.
Installation of a Tank Sensor (Water Heater
Application)
1. Turn OFF the main electrical power and the main manual
gas shutoff to the appliance.
2. Remove the side access panel from the appliance to gain
access to the wire harness.
3. Locate the two blue wires with a tag notating the remote
thermostat sensor. Feed the blue wires through the access
hole located on the back of the unit.
NOTE: It will be necessary to add additional wire to
reach from the appliance to the remote water source. Use
twisted pair wire, minimum 18 gauge or larger. See Table
5A, page 33 regarding distance versus wire gauge. Ensure
all wire insulation is trimmed to reveal at least 3/8" of
exposed wire.
4. Connect the wires to the sensor wire using wire caps.
5. Turn on the electrical power and the main manual gas
shutoff to the appliance.
6. Replace the side access panel.
7. Fire the appliance and resume operation.
(continued)
ACCESS HOLE
CONNECT THE MEASURED
WIRE TO THE SENSOR WIRE
Figure 5-5_Installation of Remote Sensors
Outdoor Air Reset Option
For boilers ordered with the Outdoor Air Reset option,
there is an additional control (FIG. 5-6). There are three
setting knobs for Shutdown, Outdoor Air Max., and Ratio.
There is also a switch to turn the outdoor air shutdown
feature On or Off. An O.A. Sensor is also included.
(c)2002 L.C. (c)2002 L.C.
55
50
CN7 CN7
45
CN8 CN8
VR3
40
W1 W1
SHUTDOWN
55
50
45
VR1
40
CN1 CN1
O.A. MAX.
160 160
140 140
120 120
240 240
OFF OFF
SETPOINT SETPOINT
Figure 5-6_Optional Outdoor Air Reset Control
Installation & Service Manual
CN1
60
O.A. SENSOR
65
ENABLE
ON
SW1
70 DISABLE
O.A. SHUTDOWN
1.0
0.9 1.1
60
1.2
0.8
1.3
0.7
65
0.6 1.4
VR2
70 0.5 1.5
W1
RATIO
10
9 9 11 11
200 200
12 12
8 8
5 5
7 7 13 13
220 220
6 6 14 14
VR2 VR2
5 5 15 15
(F-)0 (F-)0
DIFFERENTIAL DIFFERENTIAL
HIGH-FIRE HIGH-FIRE
TST2314 TST2314
CN3 CN3
CN2 CN2
OJ1 OJ1
CN4 CN4
CN5 CN5 OJ2 OJ2
CN6 CN6
W3
W2
CN9 CN9
10 10
15 15
VR3 VR3
20 20
OFFSET OFFSET
37