-3-
If a steel hydropneumatic tank is in place, replace it with a properly sized diaphragm
expansion tank. Otherwise, significant heat transfer problems can occur by causing air
to be trapped in the heat exchanger. If the boiler system has an existing expansion tank and the boiler
temperatures are being changed, resize the existing diaphragm expansion tank.
3. REQUIRED COMPONENTS AND
ACCESSORIES CHECKLIST
SHUTOFF VACUUM RELIEF THERMAL EXPANSION
MODEL CIRCULATOR ZONE VALVE* VALVE BREAKER VALVE TANK DRAIN
PRO-41ZPG Included N/A 4 1 Included Required Included
PRO-80ZPG
*If Circulator not used
TD-41ZPGLP 5GPM@ 5ft 3/4" Full Port 4 1 Included Required Included
TD-80ZPGLP or 1" STD
ALL INSTALLATIONS REQUIRE TEFLON SEALING TAPE OR PIPE DOPE FOR THREADED JOINTS.
SEE HEAT EXCHANGER PRESSURE DROP CHART TO DETERMINE PUMP HEAD REQUIREMENTS.
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