Is this your 'first time' :B
Absorption fridges have to boil the ammonia into a hot vapor which has to be condensed into a cool liquid which then supercools when it comes into contact with the hydrogen gas.
Then it flows thru freezer Low temp evap coil absorbing the heat---until freezer is cold the cool ammonia can not absorb any more heat from food compartment High temp evap coil
Once freezer temps drops to 10*F then the food compartment can be cooled below 40*F
This takes TIME....12 hrs or better on initial startup
One other point......do NOT operate fridge when stationary unless LEVEL
WILL cause overheating issues and obstructions in cooling unit