5167515-YIM-H-0518
62 Johnson Controls Ducted Systems
Burners/Orifices Inspection/Servicing
Before checking or changing burners, pilot or orifices, CLOSE
MAIN MANUAL SHUT-OFF VALVE AND SHUT OFF ALL
POWER TO THE UNIT.
1. Open the union fitting just upstream of the unit gas valve
and downstream from the main manual shut-off valve in
the gas supply line.
2. Remove the screws holding each end of the manifold to the
manifold supports.
3. Disconnect wiring to the gas valves and spark igniter(s).
Remove the manifold & gas valve assembly. Orifices can
now be inspected and/or replaced.
To service burners, complete step 4.
4. Remove the heat shield on top of the manifold supports.
Burners are now accessible for inspection and/or
replacement.
NOTE: Reverse the above procedure to replace the
assemblies.
Make sure that burners are level and seat at the rear of the gas
orifice.
Figure 32: Typical Flame
Figure 33: Typical Gas Valve
Charging The Unit
All ZH units use Thermal Expansion Devices. Charge the unit to
nameplate charge.
Control Board Navigation Components
The following components are needed to access the control
points in the Smart Equipment™ control. Installation and
operation guides are available from your equipment dealer or
distributor.
1. Local LCD on Unit Control Board.
2. Mobile Access Portal (MAP) Gateway (Portable).
• Source 1 P/N S1-JC-MAP1810-OP
3. MAP Gateway Quick Start Guide P/N 24-10737-16
4. MAP Gateway Instruction P/N 24-10737-8
For more information on the Smart Equipment™ unit control board
navigation, refer to the Smart Equipment™ Quick Start Guide.
NOTE: For more in-depth sequence of operation of the Smart
Equipment™ control, refer to the Smart Equipment™
Controls Sequence of Operation Overview LIT-
12011950.
HEAT EXCHANGER TUBE
BURNER FLAME
(BLUE ONLY)
IGNITOR
BURNER BRACKET
BURNER
GAS
SUPPLY
PIPE
INLET
PRESSURE
TAP
HIGH & LOW GAS ADJUSTMENT
OUTLET
PRESSURE
TAP
HI
LO
ON
OFF
MATE-N-LOCK
CONNECTORS
MV
C
HI
REGULATOR COVER SCREWS
(REG. ADJ. BENEATH THESE
SCREWS)
TERMINAL – HI (2ND STAGE)
ON/OFF SWITCH
C
MP
OUTLET PRESSURE TAP
INLET PRESSURE TAP
OR
TERMINAL – MP (1ST STAGE)
TERMINAL – C (COMMON)
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