Since Mr. Ekachai is out of office, I will reply you for your question.
Q1) Can we use Hand Pump instead of Gear Pump to charge oil?
(Ans.) You can use Hand Pump, however there is a possibility that your Hand Pump has not enough power.
If you cannot prepare Gear Pump, you may charge oil just after the vacuuming test.
After vacuuming test, internal pressure of the Oil tank is lower than atmospheric pressure.
If you start charging oil during oil tank's internal pressure is low, oil will be charged to tank by the force of differential pressure.
Please inform our Supervisor that you could not prepare Gear Pump. Our Supervisor will arrange oil charging after vacuuming test.
Q2) Can we use Air Blower instead of Hot Air Blower (Air Gun)?
(Ans.) Unfortunately, you cannot use Normal Air Blower. Because purpose of using this tool is for heating.
If you cannot prepare Hot Air Blower, you can use handy gas burner in place of Hot Air Blower.
We need this tool to warm up refrigerant cylinder to make its internal pressure higher.
Please refer to the attached photo, "Gas burner.jpg".
Q3) Can we use temperature Infrared (Temp. Gun) instead of temperature for measure surface temperature?
(Ans.) Yes. You can use temperature Infrared (Temp. Gun).
If you have any question, please feel free to ask us.