quest
quest
1-866-413-5214
Quest Oil Fired CHH-980 Installation, Operation and Maintenance Instructions
16
www.QuestProtect.com
sales@QuestProtect.com
4.4 Eliminating Air from the HTF Circuit:
• If there is a significant amount of air in the HTF circuit, adjust the valves as shown in (Fig. 39). Turn the
“Primary Pump Switch” ON (Fig. 15) and let the fluid circulate until all the air is eliminated from system.
Air has been purged when steady pressure of 35 to 40 PSI is observed at the glycol pressure gauge (Fig.
28).
• Once all air is eliminated, turn the pump OFF and set the valve arrangement for normal operating mode
(Fig. 40 or 41 below).
• Check the HTF level again and top up if necessary (1/8 to 1/4 full). See step 4.3 above.
4.5 Normal 2-Pump Mode with Full Load:
• If the CHH-980 is connected to a distribution system that will demand most of its capacity in terms of
flow requirements and heat draw, the “Normal 2-pump Mode” should be used.
• Adjust the valves as shown in (Fig. 40). Turn ON the “Primary Pump Switch” and the “Secondary Pump
Switch” (Fig. 15).
39: Rapid Air Removal.
40: Normal Mode with 2 Pump Operation.