Greenheck Energy Recovery and Make-Up Air Start-Up Report - Manual (Page 7)

7
Direct Gas-Fired Heating N/A
Gas regulator installed: Regulator: NG LP Supply pressure: in. wg
High & low pressure switches installed: High setting: in. wg.
Typical 8 in. wg
Low setting: in. wg
Typical 3 in. wg (Natural Gas)
Burner differential pressure: in. wg Between 0.625 and 0.675 in. wg
Set low fire time delay: Between 75% of it’s max. setting.
Should provide at least 10 sec. of low fire while lighting.
Set max. firing rate: Disconnect the wire connected to terminal #4 (Maxitrol 14)
Disconnect the wire connected to terminal #2 & #4 (Maxitrol 44)
Jumper terminals T1 & T2 (Maxitrol SC-25)
Adjust regulator to achieve design T Design T: ºF
Set min. firing rate: Disconnect one of the wires running to the modulating valve
Adjust minimum firing rate to provide continuous flame that covers both the flame rod and
the entire burner
Increase = CCW
Decrease = CW
Flame signal: Honeywell = 1.25 VDC
BASO = 1.0 AMP Signal:
Discharge air temp setting: DAT Set point: ºF
Comments:
Gas Pressure Chart
Direct Gas
Max. Inlet Gas Pressure
(natural gas or propane)
Min. Gas Pressure
(natural gas)
Min. Gas Pressure
(propane)
< 800 MBH
0.5 psi (14 in. wg)
7-12 in. wg
(output dependant)
3 in. wg
> 800 MBH 5 psi 0.5 psi (14 in. wg) 3 in. wg
Indirect Gas
High Fire
Low Fire
(staged control)
Low Fire
(2:1 modulating)
Low Fire
(4:1 modulating)
Natural Gas 3.5 in. wg 0.875 in. wg 0.875 in. wg 0.333 in. wg
Propane 10 in. wg 2.5 in. wg 2.5 in. wg 1 in. wg