User Guide

ManualsBrandsBarber Colman ManualsHVAC Replacement PartsTwo Pipe Thermostat (55-85F)

Figure-4

Procedure

To mount a thermostat on an AT-506 and AT-508 wall box

fitting, refer to Figure-3:

1. Remove and discard the cardboard cover plate on the wall

box. The cardboard cover protects the fitting while the wall

is being plastered.

2. Fasten the mounting plate to the wall box with the two flat

head screws provided. Make sure it is square with the

wall before tightening the screws.

3. If the thermostat tubing is too long for easy coiling in the

wall box, it can be cut to length. Cut the tubing at a 45°

angle, for ease in inserting the tubing into the “O” ring

seal. Be sure that the coil spring is cut flush with the

tubing.

4. Remove and discard the short piece of tubing from the

connector head of the wall box.

5. Place the fiber board insulator over the tubes on the back

of the thermostat.

6. Insert the main (black) plastic tubing into the left hand

hole in the connector head. Insert the branch line (white)

tubing in the right hand hole in the connector.

TK-1601 — Insert the auxiliary branch line (A White) in

the center hole in the connector. Insert tubes at least

1/4-inch. Do not use any lubricant on the plastic tubing.

7. Fasten the thermostat to the mounting plate with the

three Allen mounting screws provided. Tighten the

screws evenly.

To mount a thermostat on an electrical switch box. When

installing a thermostat to an electrical switch box (Figure-2) in

a masonry wall proceed as follows:

1. Attach the mounting plate to the switch box with the two

flathead screws provided. Be sure the mounting plate is

vertical.

2. Place the fiber board insulator over the tubes on the back

of the thermostat.

3. Slightly rotate the tubes back and forth, and push firmly

on to the fittings (Figure-5).

Figure-5

4. Fasten the thermostat to the mounting plate with the Allen

head screws provided and tighten evenly.

To mount a thermostat on an AT-507 mortar joint fitting

(Figure-1) proceed as follows:

1. Remove the screws holding the protector black in place.

Pry out and discard the protector block. Pull out and

discard the short piece of plastic tubing inserted in the

connector head.

2. Attach the thermostat mounting plate to the connector

head with the two flathead screws provided. Be sure the

mounting plate is vertical.

3. Measure 7/8-inch from the back of the thermostat and cut

the tubing at a 45° angle to make the tubing slide into the

connector head easily. Remove the coil spring from the

tubing and discard.

4. Insert two 3/4-inch lengths of copper tubing, supplied with

the thermostat into the plastic tubing to stiffen the plastic

tubing so it can be installed easily.

5. Place the fiber board insulator over the tubes on the back

of the thermostat.

6. lubricate the outside of the two plastic tubes (this applies

to the mortar joint fitting only) with water or glycerin. Be

sure that none of the lubricant gets inside the tubing.

7. Insert the tubes in to the connector head. Slightly rotate

the tubes back and forth, and push firmly into the sockets

at least 1/4 inch.

8. Fasten the thermostat to the mounting plate with Allen

screws provided, and tighten evenly.

CHECKOUT

After installing the thermostat, verify proper operation as

follows:

1. To check the nozzle and/or restriction, turn the setpoint dial

to 85°F. If the thermostat is direct acting, the output

pressure will drop. If the thermostat is reverse acting, the

output pressure will rise. Turn the setpoint dial to 55°. If the