User manual HONEYWELL FTS 015

[. . . ] Phase at 4 °C: switch off unit with microswitch (potential-free) If the output signal of the controller (Y-signal) is looped through the frost protection, a maximum selection of the two signals takes place. If the Y-signal from the controller is larger than the output signal of the frost protection, the controller determines the position of the heating valve (normal operation). If the output signal of the frost protection is larger than the Y-signal of the controller (risk of frost) then the frost protection determines the position of the heating valve as long a "Risk of frost" is signaled by the sensor. [. . . ] The frost protection would come into operation at a too low temperature even if there were no risk of frost in the air warmer. Routing the capillary tube: 5 capillary tubes for mounting the capillary to the air-heater are enclosed with each unit. Preferably the capillary tube is run meanderingly over the entire cross section of the air-heater. Note that the capillary tube should also cover the area of the return connection. Lf further holders are required, please order these under Type H3 (contains 5 holders. The types FTS- and FTSB015 sense the temperature over the entire lengths of the capillary tube and thus serve for two-dimensional monitoring of the air warmer. the frost-protection reacts to under-cooling of the capillary tube at any place. When the capillary tube is routed, it is essential that the capillary tube is not damaged and never kinked. Since the entire lengths of the capillary acts as sensing element, the full lengths of the capillary needs to be installed in the duct. This will ensure proper functioning of the modulating output (0. Attention: The ambient temperature of the switchgear may not fall below the working range of the FTS015 or FTSB015 device. This also applies for parts of the capillary tube, which are laid outside of the air warmer by reasons of mounting. (Take care when routing the capillary tube in cold rooms or outside). Lf the capillary tube is broken or damaged, the limit switch switches off towards to the safe side. Switch off power before removing cover of casing or plug !Pull off module vertically, do not bend the connection pins. [. . . ] When the supply voltage is applied, the output signal must change in accordance with the movement of the bridge. Upward movement of bridge corresponds to falling temperature. On completion of testing, carefully screw on the cover in the following sequence: rubber seal, scale plate, cover glass. [. . . ]