Tekmar 263 Boiler Control User Manual download pdf (Page 24)

DHW Pump Or Valve (DHW Pmp / Vlv)

If a DHW pump or DHW valve is connected to the DHW Pmp / Vlv terminals (9 and 10),

make sure the power to the pump or valve circuit is off and install a jumper between

those terminals. When the DHW circuit is powered up, the DHW pump should turn on or

the DHW valve should open completely. If the DHW pump or valve fails to operate, check

the wiring between the terminals and the pump or valve and refer to any installation

or troubleshooting information supplied with these devices. If the DHW pump or valve

operates correctly, disconnect the power and remove the jumper.

CONNECTING THE CONTROL

Make sure all power to the devices and terminal blocks is off, and remove any remaining

jumpers from the terminals.

Reconnect the terminal blocks to the control by carefully aligning them with their respective

headers on the control, and then pushing the terminal blocks into the headers. The terminal

blocks should snap firmly into place.

Install the supplied safety dividers between the unpowered sensor inputs and the powered

or 115 V (ac) wiring chambers.

Apply power to the control. The operation of the control on power up is described in the

Sequence of Operation section of the brochure.

TEST THE MODULATING OUTPUT

If a modulating device is used, connect an ammeter to the modulating

output Mod 1 terminals (15 and 16) and observe the current reading

during operation. For example, when using a 4-20 mA output, the initial

percentage output is zero and the meter should read 4 mA. As the Boiler

Modulation in the VIEW menu increases, the meter reading should

increase until the Boiler Modulation reaches 100% at which point the

meter should read 20 mA. When the 4-20 mA modulation decreases, the

meter should start at 20 mA and eventually reach 4 mA when the display

shows 0% Boiler Modulation.

Cleaning the Control

The control’s exterior can be cleaned using a damp cloth. Moisten the cloth with water and wring out prior to wiping control. Do not

use solvents or cleaning solutions.

DHW

Pmp/Vlv

24 to 230 V (ac)

Prim

DHW

Pmp/Vlv

Power

Mod 1 mA

1 2 ... 19 20 21 22 23 24 25 26 27 28 29 ... 35 36

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Tekmar 263 Boiler Control User Manual Page 24