Thermo Pride Gas/Propane Furnace Induced Draft Highboy/Counterflow/Horizontal MHA1 - Manual (Page 32)

All installations and services must be performed by qualified service personnel.
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Table 6: Blower delay settings for heating cycles
To delay fan
turn-on by:
Set Switch
#1 #2
15 sec.
30 sec.
*45 sec.
60 sec,
Off Off
Off On
On Off
On On
To delay fan
turn-off by:
Set Switch
#3 #4
60 sec.
90 sec.
120 sec.
*180 sec.
On On
Off On
On Off
Off Off
*Factory settings for optimal performance
III. Initial Operation of the Furnace:
A. Initial Startup:
:
• Turn off power to furnace. Before the gas piping system is placed
into service, it must have been leak tested by a qualified heating
contractor. (Refer to the General Gas Piping Requirements section of
this manual regarding the installation and leak testing of gas piping).
• For initial start-up of the appliance after installation, it may be
necessary to purge the air out of the gas line. A qualified heating
contractor should do this. If excessive gas escapes when purging
the gas supply at a pipe union joint, allow the gas to disperse for at
least 15 minutes before attempting to start the appliance. LP gases
are especially dangerous because the specific gravity of LP gases
allows them to accumulate at ground level at possibly explosive
concentrations.
Review the following items before the initial startup. It may be helpful to review
the Sequence of Operations in Appendix B of this manual, also.
a. Check all wiring for loose connections and proper hook-up. Refer to the
connection diagram.