Lochinvar 80 - 285 User Manual download pdf (Page 47)

Installation & Operation Manual

Low voltage connections

1. Route all low voltage wires through the knockouts in the

rear of the boiler, as shown in FIG. 8-2.

2. Connect low voltage wiring to low voltage connection

board as shown in FIG. 8-3 on page 49 of this manual and

the boiler wiring diagram.

Figure 8-2 Routing Field Wiring

8 Field wiring (continued)

Thermostat

1. Connect the room thermostat or end switch (isolated

contact only) to terminals R and W, as shown in

FIG. 8-3.

2. Install the thermostat on the inside wall away from

influences of drafts, hot or cold water pipes, lighting

fixtures, television, sunlight, or fireplaces.

3. Thermostat anticipator (if applicable):

a. If connected directly to boiler, set for 0.1 amps.

b. If connected to relays or other devices, set to match

total electrical power requirements of connected

devices. See device manufacturers’ specifications

and thermostat instructions for details.

Outdoor temperature sensor

1. Connect outdoor temperature sensor (FIG. 8-3) to the

outdoor sensor terminals on the connection board to

enable outdoor reset operation of the Knight boiler. If

fixed temperature operation is required, do not install

outdoor sensor.

2. Mount the sensor on an exterior wall, shielded from

direct sunlight or flow of heat or cooling from other

sources.

3. Route sensor wires through a knockout at the rear of the

boiler (see FIG. 8-2).

DHW thermostat

1. Connect storage indirect water heater (DHW) thermostat

(FIG. 8-3) to the DHW thermostat terminals on the

connection board.

DHW tank sensor

1. By installing a tank sensor, the SMART SYSTEM control can

perform the tank thermostat function. The SMART

SYSTEM control automatically detects the presence of this

sensor and generates a DHW call for heat when the tank

temperature drops 6°F (3°C) below the tank set point and

finishes the call for heat when the tank temperature reaches

the tank set point.

2. The tank sensor included with the Lochinvar Squire Indirect

DHW tank (TST2032) is the only sensor suitable for use

with the SMART SYSTEM control. Connect the sensor

leads to the DHW Tank Sensor (AUX) terminals on the Low

Voltage Connection Board (FIG. 8-3). Consult the tank

manufacturer for application and performance when used

with any other indirect tank.

3. If the TST2032 is not compatible with the indirect tank, a

tank thermostat can be used to control the boiler. The tank

thermostat should be installed per the manufacturers

instructions and wired to the DHW Thermostat terminals

on the Low Voltage Connection Board.

Auxiliary device relay

1. If an auxiliary device (e.g., louvers) needs to operate when

the boiler fires, it can be controlled by this output. Connect

these terminals to a 24 vac relay coil, which is wired to

operate the auxiliary device (FIG. 8-3).

Auxiliary device proving switch

1. When the operation of an auxiliary device needs to be

verified before the boiler fires, remove the jumper wire from

these terminals and connect them to the normally open

contacts on its proving switch (FIG. 8-3).

High gas pressure switch

1. If a switch is provided to detect excessive gas pressure,

remove the jumper wire from the terminals on the

connection board, and then connect them to its normally

closed contacts (FIG. 8-3).

Failure to use the correct sensor may result in

the tank temperature being either above or

below the set point. Failure to consult the

manufacturer of the indirect tank, when the

Squire is not used, may result in decreased

performance or the risk of scald injury.

 WARNING

1 2 ... 42 43 44 45 46 47 48 49 50 51 52 ... 75 76

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Lochinvar 80 - 285 User Manual Page 47

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