i got my danfoss valve today and was looking it over. i have a "T" with a big spring in it and a thermostat in a bag. thermostat wontgo inany end of the 'T" so i take iti have to take off the one cover, remove the spring and install the thermostat??? i did not get any instructions on that to do with the thermostat. also what is everybody using for circulator pumps for the primaryloop?? i am going to have about 15-20 feet of 1 1/2pipe with a 500gallon take ona eko60. thanks in advance