Page 2
O23 Unit Dimensions − Inches (mm)
SUPPLY
AIR
OPENING
FLUE
CONNECTION
(On Heat
Exchanger)
AIR FLOW
ELECTRICAL INLET
(Right Side Only)
OIL PIPING INLET
(Left Side Only)
RETURN AIR
OPENING
(Either Side)
TOP VIEW
SIDE VIEW
FRONT VIEW
22
(559)
14
(356)
2 (51)
1-1/2
(38)
23-1/2
(597)
54
(1372)
1-1/2
(38)
3/4
(19)
A
B
C
D
3/4
(19)
22
(559)
RETURN AIR
E
RETURN AIR
1-1/4
(32)
TOP FLUE
OUTLET
SIDE
FLUE OUTLET
CENTERING HOLE
(Field Fabricate
Either Side)
OPT. OUTDOOR
COMBUSTION
AIR INLET
CENTERING HOLE
(Field Fabricate
Right Side only)
Model No.
A
B
C
D
E
O23Q2/3-70/90
in.
19-1/2
30-5/8
18
19-5/8
16
O23Q2/3-70/90
O23Q3/4-105/120
mm
495
778
457
498
406
O23Q5 140/154
in.
22-1/2
33-1/8
21
22-1/8
18
O23Q5-140/154
mm
572
841
533
562
457
O23 Start−Up & Performance Check List
Filter Clean & Secure?
Supply Voltage
Electrical Connections Tight?
Job Name
Job Location
Installer
Unit Model No.
Oil Pump Pressure [recommended min. 100 psig for −70;
min. 140 psig for all other units )]
Job No.
City
City
Serial No.
Date
State
Serviceman
Draft Reading (recommended .03−.04 inches w.c.)
Flue Connections Tight?
HEATING SECTION
THERMOSTAT
Calibrated?
Heat Anticipator Properly Set?
Level?
Blower Motor Amps
Blower Motor H.P.
Blower Motor Lubrication O.K.?
Piping Connections Tight?
Vent Clear?
State
Temperature Rise
Fan Control Cutout
Fan Control Setting (maximum 130
_
F)
Burner Model No.
Serial Number
All Valves Open?
PROPER DRAFT
% CO
2
(recommended 12%)
(55
_
C)
