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106308-05 - 3/23
APEX Installation, Operating, & Service Instructions APEX Installation, Operating, & Service Instructions
V. Controls Start-up Check List
Check field wiring and control parameters per below Table 9-9 and Table 9-10. The control is factory
programmed with default parameters. Review parameters and adjust as necessary to conform to specific site
requirements. From Home Screen, select ADJUST to access below listed parameters. Login as needed to make
changes. For detailed login instructions, refer to Section 10 “Operation”, Paragraph J. Parameter Adjustment.
Step Wiring Location Parameter Description
1 120V PCB
120V Line Is line voltage connected with overcurrent protection?
Boiler, System,
and DHW Pumps
Confirm pumps are connected. If using room air for combustion,
confirm combustion air damper is connected.
2
Low Voltage
Connections PCB
Enable/Disable
Is the space heating thermostat connected. Ensure thermostat is a
“dry”, non-powered input.
DHW Demand Is an indirect water heater (IWH) providing a heat demand?
Auto Reset
and Man Reset
External Limit
Are external limits used? If so, ensure jumper is removed and limits
properly connected. Also check that external limits are closed and
any manual reset devices are reset.
Lockout Alarm Are alarm contacts connected?
EnviraCOM Are any EnviraCOM devices used?
Outdoor Sensor Is an outdoor sensor used? Refer to Steps 1 & 7 in Table 9-10.
Header Sensor
Is a header sensor used? A header sensor is required for the
master boiler in a multiple boiler installation. Refer to Step 8 in
Table 9-10 to activate this input.
DHW Sensor
For single boiler servicing indirect water heater (IWH), install DHW
sensor at boiler-side inlet to IWH. Refer to Step 6 in Table 9-10 to
activate this input.
Remote 4-20mA
Is a 4-20mA input required for: 1) modulation input from an
energy management system, or 2) Central Heat setpoint input from
external multiple boiler control? If yes, refer to Step 11 in Table
9-10.
Boiler-to-Boiler
Are multiple boilers connected? If yes, refer to Steps 8 & 9 in Table
9-10 to activate boiler-to-boiler communication.
EMS
Is the boiler connected to an energy management system? If yes,
refer to Step 10 in Table 9-10.
Flow Switch Is flow switch installed in piping and plugged in?
LWCO Is a 24V LWCO used? Check installation.
Table 9-9: Field Wiring Checklist
9 System Start-up (continued)
WARNING
Asphyxiation Hazard.
•
If the throttle is very far out of adjustment on the “rich” (counter-clockwise) side, the boiler burner may be
running at 0% excess air or even with air deficiency. Operating the boiler in this condition may cause property
damage, personal injury or death.
•
At 0% excess air the CO
2
readings will be either 11.9% CO
2
for natural gas or 13.8% CO
2
for LP gas (O
2
will be
0%) and CO air free level will be extremely high (well over 1,000 PPM).
•
If the burner operates with air deficiency, the following phenomena may be observed:
% CO
2
will actually drop (% O
2
will increase) as the throttle is turned counter-clockwise
% CO
2
will actually increase (% O
2
will drop) as the throttle is turned clockwise
•
If the boiler appears to operate with air deficiency, shut down the boiler and follow instructions in Paragraph U
“Correcting Throttle Screws Mis-Adjustment. Then, use a combustion analyzer to verify and adjust O
2
(or CO
2
)
and CO air free to values shown in Table 9-2 for natural gas or Table 9-3 for LP gas.
!
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