SPECIFICATION DAT A 63-1332-02 TR21-WS, TR23-WS, TR21-WK, TR23-WK, WRECVR The WRECVR receiver and TR21-WS, TR23-WS, TR21-WK, and TR23-WK ar e a family of wirel ess wall modules and receiver for use with: — S pyder Unitary Controllers: PUL, PVL, etc. — Excel 10 W7750, W7751, W7752, and W7753 controllers — T7350, T7351, and TB8575 low-voltage S ...