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SECTION VI - UNIT SHUTDOWN
C. Gas Pressure Switches - Operate unit in Heat mode.
The low pressure switch will trip out and must be reset
before resuming operation when the inlet gas valve is
turned off during operation.The high pressure switch
may be checked out by reducing the setting of its trip
point below unit operating pressure. It should then trip
out and shut off the burner. Return the adjustment to
its original setting and reset to resume operation.
When checking operation of gas pressure switches on
systems without pilot the heat switch will have to be
turned off for approximately five seconds to reset the
ignition control.
D. Air Pressure Switches - The high air pressure switch is
checked by removing the sensing tube from the enter-
ing air side of the burner. Switch operation will shut
off the burner. Recycle is automatic when the sensing
tube is replaced.The low air pressure switch is checked
by removing the sensing tube from the leaving air side
of the burner. Switch operation will shut off the burner.
Recycle is automatic when the sensing tube is replaced.
When checking operation of air pressure switches on
systems without pilot the heat switch will have to be
turned off approximately five seconds to reset the igni-
tion control.
E. Temperature Controls – These controls are checked by
adjusting control settings to a lower temperature setting
while the unit is operating on high fire and observing
cutoff. The controls should be reset to settings shown
below:
Suggested Control Settings
TC-01 Room Thermostat ...................Customer Discretion
TC-03 On-Off Inlet Ductstat ............................................65°F
TC-08 Freeze Thermostat ..................................3 min.,...45°F
PS-04 Low Gas Pressure Switch ................................1.0”w.c
PS-07 High Gas Pressure Switch............125% of firing rate
TC-09 Night Set Back Room .................Customer Discretion
TC-52 Remote Temperature Selector .... Customer Discretion
FL-02 High Temperature Limit (manual) ........ Not adjustable
RE-26 High Limit Discharge Ductstat ................................95°F
RE-26 Low Limit Discharge Ductstat ................................ 55°F
PS-12 Clogged Filter Switch ....... Adjust to Field Conditions
PS-13 Building Pressure Switch ..Adjust to Field Conditions
A. Extended Shutdown -
1. Set the Heat OFF/ON switch to the OFF, then turn the
Fan switch to the OFF position.
2. Close all manual gas valves.
3. Open the main electrical disconnect switch.
B. Emergency Shutdown ONLY -
1. Open the main electrical disconnect switch.
2. Close all manual gas valves.