Procedure: Install a 5-lb bypass spring check valve (AquaCal P. N.: 2556, or equal to Del Industries PN: CO-0103) across the “IN” and “OUT” water ports of the heat pump. Make certain the direction of the check valve flow will be from water inlet to water outlet.
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If titanium condenser, see page 2.1. If titanium condenser, see page 2.1.