Installation Guide
Oatey.com
INSTRUCTION GUIDE
HERCULES CRYO-TEK
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Charge the System
The system should be completely empty with the burner and pump shut off. All internal valves, including
zone valves, should be open. THE ENTIRE SYSTEM SHOULD BE OPEN TO PREVENT ANY AREA OF IT
FROM BEING ISOLATED.
First, add the computed amount of Cryo-Tek product. Second, add water if necessary. The system can
be lled using one of the following two alternatives. The main objective is to ll the system with little or no
air trapped in it.
A. After providing an air exit, pump solution into boiler through the boiler drain valve using a small
pump.
B. Pour solution through a removed air vent at the HIGHEST point in the system.
Purge the Air in the System
Since air (which includes oxygen) trapped in a system not only results in inefciencies in the operation of
the system (wasted energy and excessive noise), it can also cause corrosion. To prevent this, the system,
once lled, needs to be purged of all air.
Test the System
Once installed and fully operational, use Hercules Refractometer with Refractometer Reading Adjustment
Chart and a pH Meter or Cryo-Tek Test Strips to test the uid and ensure proper freeze and corrosion
protection.
Note: Automotive coolant tester will not work with Cryo-Tek or other propylene glycol anti-freeze mixtures.
Maintenance
Systems with Cryo-Tek products installed should be tested annually for product concentration and
inhibitor levels using Hercules Refractometer with Refractometer Reading Adjustment Chart and a pH
Meter or Cryo-Tek Test Strips. If Cryo-Tek product concentration levels are low, add Cryo-Tek products
using the following formula:
Total System Capacity (gal.)×
(% Cryo Tek - % Cryo Tek in System)
(% Cryo Tek Used - % Cryo Tek in System)
=Number of Gallons of Cryo Tek Product to be Added