Milnor 5050, Service Manual

Page: 35 / 140

Pellerin Milnor Corporation
Returns to automatic
5. Adjustment Steps
BNDGUM01.C07 0000337473 C.2 A.3 4/6/21, 11:59 AM Released
Refer to Section 2 : Summary of Steps and Required Values (Air Heat), page 2 while you do these
procedures. In these steps, mount the manometer vertically and use the high pressure scale, ex-
cept where stated otherwise.
WARNING:
Explosion hazard — Improper maintenance procedures can cause the rap-
id release of gas.
�
You must be an approved technician.
�
Make sure you can quickly shut off gas at the external valve.
WARNING:
Crush and entangle hazard — Moving components can crush and entan-
gle body parts.
�
Work with electrical power removed from the machine, except where
stated otherwise in this document.
�
Use extreme caution when you work near moving components.
5.1. Step 1: Static (incoming) gas pressure
BNDGUM01.C08 0000337472 C.2 A.3 3/24/21, 9:39 AM Released
1. Remove electrical power and gas from the machine.
2. Look at Figure 1, page 4 . Attach one side of the manometer to gauge point GGS (the higher
pressure). Leave the other side open to the atmosphere.
3. Supply gas to the machine.
4. Adjust the incoming gas (upstream from dryer) as close as possible to the maximum static gas
pressure listed in Section 2 , page 2 . This pressure is necessary for further adjustments. Pres-
sures higher than specified can damage the regulator.
5.2. Step 2: Combustion air pressure
BNDGUM01.T01 0000337471 C.2 A.4 4/5/21, 4:24 PM Released
Fireye
Start the Setup procedure and select SETUP MODE A ( Section 4.1 , page 6 ) . The com-
bustion air motor runs. The main air pressure switch, modulating gas valve and the two main
gas valves are disabled.
Gyr Start the Manual method ( Section 4.2 , page 7 ). If the flame control trips during
this procedure, press and to reset it.
In this step, you will measure a small differential pressure. It is necessary to mount the manome-
ter near horizontal and use the low pressure scale.
1. Look at Figure 2, page 5 . Turn the dial on SPCA counterclockwise to the lowest value.
Set the Heating System—Air Heat Dryer
31