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S
XT I
, O
ERIES
NSTALLATION
PERATION AND
7.
Check lifting brackets to make sure they are tight and
secure before lifting heater.
OK __.
8.
For FR, AM models: CO2 sensor installed?
OK ____
The following procedures reference pages and tables from the
2000-Series Installation, Operation and Service Manual
(P/N RP121100NA). Contact the local WEATHER-RITE
independent distributor or Weather-Rite LLC for a manual.
At Start-up:
Verify proper belt tension and sheave alignment per instructions
on Page 62, Section 20.2.1.
OK _____.
Verify proper torque on all sheaves per table on Page 63, Section
20.2.2.
OK _____.
Air Temperature Sensing:
1.
The sensing probe is factory mounted in the blower hous-
ing. (Advance to next section.)
Electrical (Page 40, Section 16)
1.
Check all motor starters for proper overload settings. The
overload should not exceed Full Load Amps for the motor.
___________ A.
2.
What is the supply voltage to the air handler?
Air Hander Off ____ #1____#2 ____ #3 ____
Air Hander On ____ #1____#2 ____ #3 ____
3.
Verify correct fan rotation. OK ______.
4.
What is total system current draw?
Motor current draw (Burner Off)? _________.
Burner and motor current draw? _________.
5.
Compare all variable frequency drive (VFD) programming
parameters with specifications provided on electrical
drawing. OK _____.
6.
For VFD systems, make sure to set programming parame-
ters for proper overload protection.
(See VFD Instruction Manual). OK _____.
7.
If more than one exhaust motor is used with one VFD,
each motor must have its own overload protection.
OK _____.
Differential Pressure: (Page 39, Section 15.5.1)
1.
In order to verify proper airflow across the burner, the dif-
ferential pressure across the profile plate needs to be
measured. Attach a manometer to the pressure test ports
where the pressure switch is attached and measure the
differential pressure with a manometer. This reading must
be 0.9 in wc +-0.1 in wc (2.24 +/- 0.25 mbar)
Record differential box pressure _______ in. wc/mbar
Burner Pressure: (Page 39, Section 15.5.2)
1.
A pressure tap between the Maxitrol modulating valve and
the burner is used to measure negative airflow at the
burner and to set high fire gas pressure. This tap could
also be located on the Maxitrol valve itself, manual shut off
valve or "T" fitting. See unit data plate on control enclosure
door for high fire setting.
2.
Record burner pressure with inlet manual gas valve off
and blowers on ______________ in wc/mbar
Gas Piping and Initial Pressure Setting:
88
S
M
ERVICE
ANUAL
™
(Page 39, Section 15.4)
1.
Perform a pressure test on all gas supply lines to air han-
dler per local codes. OK _____.
2.
Verify supply pressure does not exceed maximum rated
gas pressure as stated on the rating plate. OK_____.
3.
Set the supply gas pressure at the step down regulator
(normally outside of the enclosure if one is installed),
according to the rating plate inlet gas pressure specifica-
tions.
Fuel Type: _______ Pressure: ___________.
4.
Only after performing steps 1-3, open the main gas valve
and close the manual gas valve downstream of the MR
valve. Set the burner switch to on. Verify pilot pressure,
and flame signal of 5.0 VDC. OK ______.
(To adjust pilot flame, set pilot regulator to 1.0 in wc (2.5 mbar)
natural gas or 0.5 in wc (1.25 mbar) L.P. gauge pressure.
5.
Open both manual gas valves at air handler. Force the
burner into high fire. See Page 65, Table 17, "Burner
Mode By Amplifier Type" . Read the gas pressure at the
MR valve and set according to the determined high fire
gas pressure in Table. The small cap screw is for high fire
on MR212 valve only. Take a reading of the temperature
rise. Temperature rise must be in accordance with Page
66, Table 18.
High Fire Discharge Temperature ______°F/°C
_______Manifold Pressure for Maximum Input
(from rating plate)
_______Burner Pressure
_______High Fire Gas Pressure Setting
There are three critical items to consider before adjusting low fire:
A. Low fire adjustment does not regulate gas pressure.
B. If the low fire adjustment screw is set to maximum, high fire
regulation problems will occur.
C. The burner control system must be forced into low fire per
Maxitrol's instruction for the given amplifier/temperature control
system. See Page 65, Table 17, "Burner Mode By Amplifier Type" .
*
6.
Low fire is set at the MR212 valve using the adjustment
screw under the large cap screw, or on the M611 valve
using the brass adjusting screw on the side. The burner
must be forced into low fire first. The low fire ribbon across
the burner must be adjusted. OK________.
Once gas pressure and high/low fire adjustments are made,
the gas setup is completed. All taps and instruments must be
removed and all caps and plugs must be replaced.
Please leave all manuals and
a copy of this sheet with the air handler!
Technician's Name:_________________________
Signature:_________________________________
Date:_____________________________________
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