1. Gauge Installation and Removal
Procedures
By: Inmer Amaya

2. Tools Needed
Gauge Manifold Reversible Ratcheting
Refrigeration Wrench

3. Step #1 Preparing Gauge Manifold for
Installation
 Disconnect hoses from blank ports of
gauge manifold. They are located on
back side of the gauges.
 Inspect gauges to ensure calibration
and calibrate if needed.

4. Step #2 Preparing High side
of Gauge manifold
 Remove service valve cap from
liquid line service valve
 By using ratchet wrench make
sure valve is back seated
 Remove service port cap from
liquid line service valve
 Once service port cap is removed
place on blank port of gauge
manifold
 Connect high side hose from
gauge manifold to the service
port on the liquid line service
valve

5. Step #3 Preparing Low side
of Gauge Manifold
 Remove service valve cap
from suction line service valve
 By using ratchet wrench make
sure valve is back seated
 Remove service port cap from
suction line service valve
 Once service port cap is
removed place on blank port of
gauge manifold
 Connect low side hose from
gauge manifold to the service
port on the suction line service
valve

6. Step # 4 Releasing high side
pressure
 Crack the liquid line service
valve off the backseat
 Replace the service valve cap on
the liquid line service valve
 Open the high side valve on the
gauge manifold
 Open the low side valve on the
gauge manifold

7. Step # 5 Purging air from hoses
and combining pressures
 Loosen the hose connection on
the suction service valve (1-2
seconds) to purge air from hoses
and manifold then tighten the
hose connection back
 Loosen the center hose
connection on the blank port of
the manifold to purge air
 Close the high side and low side
valves on the gauge manifold
 Crack the suction service valve
off the back seat
 Replace service valve cap on the
suction service valve

8. Step # 6 Uninstalling the
Gauge Manifold
 Remove service valve cap from
liquid line service valve
 Backseat the liquid line service
valve
 Open high and low side valves
on the gauge manifold. Allow
pressures to equalize.
 Close the high and low side
valves on gauge manifold.
 Remove service valve cap from
suction line service valve.
 Backseat the suction line
service valve

9. Step # 7 Removing hoses from
system
 Remove high side hose from the
liquid line service valve
 Remove the service port cap from
the high side blank port of the
gauge manifold and place it on the
liquid line service valve
 Connect the high side hose to
blank port of gauge manifold
 Remove the low side hose from
the suction line service valve
 Remove the service port cap from
the low side blank port of the
gauge manifold and place it on the
suction line service valve
 Connect the low side hose to
blank port of gauge manifold

10. Step # 7 Continued
 Replace the service valve cap on
the liquid line service valve
 Replace the service valve cap on
the suction line service valve

11. Works Cited
 (2010). 3/4" Suction Line Service Valve (Sweat) YORK
[Web Drawing]. Retrieved from
http://www.bestbuyheatingandairconditioning.com/Merchant2/mer
 Whitman, B., Johnson, B., Tomczyk, J., & Silberstein, E.
(2012). Refrigeration and air conditioning technology. (7th
ed.). New York: Cengage Learning