Klimaire GM80S Series - Manual (Page 27)

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I&O manual
Regulator
Cover
Screw
Regulator
Spring
Plastic
Regulator
Adjustment
Screw
Regulator
Sleeve
Fig. 28 Gas Valve and Regulator Adjustment
Inlet
Wrench
Boss
Inlet
Pressure
Port
On/Off Switch
(Shown in ON position)
Main Regulator
Adjustment
Outlet
Outlet
Pressure
Port
Vent Port
To prevent unreliable operation or equipment damage, the
gas manifold pressure must be as specified on the unit rating
palte. Only minor adjustments should be made by adjusting the
gas valve pressure regulator.
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This valve is shipped from the factory with the regulator preset
Consult the appliance rating plate to ensure burner manifold
pressure is as specified. If another outlet pressure is required
follow these steps.(See Table 13 and Fig. 28)
1. Turn OFF all electrical power to the system.
2. Using a 3/32 inch hex wrench loosen outlet pressure tap (boss)
screw one turn. Do not remove screw.
3. Attach a hose and manometer to the potlet pressure boss of valve
to over lap at least 3/8”
4. Turn ON system power and set thermostat to a call for heat.
5. Using a leak detection solution or non-chlorine soap suds
check for leaks at hose connection. Bubbles forming indicate a
leak. SHUT OFF GAS AND FIX ALL LEAKS IMMEDIATELY!
6. Remove regulator screw cover. Turn regulator screw either
clockwis to increase pressure or counter clockwise to decrease.
Always adjust regulator to provide the correct pressure according
to the original equipment manufacturer specifications listed on the
appliance rating plate.
7. Replace regulator screw cover and finger-tighten securely.
8. Turn OFF all electrical power to the system.
9. Remove manometer and hose from outlet pressure tap.
10.Tighten outlet pressure tap clockwise 7 in-Ibs minimum to seal port.
11. Turn ON system power and set thermostat to call for heat.
12. Using a leak detection solution or non-chlorine soap suds 1`
check for leaks at hose connection. Bubbles forming
indicate a leak. SHUT OFF GAS AND FIX ALL LEAKS
IMMEDIATELY!
Measure gas manifold pressure with burners firing. Adjust
manifold pressure per the Manifold Gas Pressure table.
The final manifold pressure must not vary more than 0.3 w.c.
from specified manifold pressure.
Any necessary major changes in gas flow rate should be made by
changing the size of the burner orifice.
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The gas input rate to the furnace must never be greater than that
specified on the unit rating plate. To measure natural gas input
using the gas meter use the following procedure.
1. Turn OFF the gas supply to all other gas-burning
appliances except the furnace.
2. While the furnace is operating, time and record one
complete revolution of the smallest gas meter dial.
3. Calculate the number of seconds per cubic foot (sec/ft3) of
gas being delivered to the furnace. If the dial is a one cubic
foot dial divide the number of seconds recorded in step 2
by one. If the dial is a two cubic foot dial divide the number
of seconds recorded in step 2 by two.
4. Calculate the furnace input in BTUs per hour (BTU/hr).
Input equals the installation's gas heating value multiplied
by a conversion factor (hours to seconds) divided by the
number of seconds per cubic foot. The measured input
must not be greater than the input indicated on the unit
rating plate.
EXAMPLE:
Installation's gas heating (HTG) value: 1,000 BTU/ft3
(Obtained from gas supplier)
Installation's seconds per cubic foot: 34 sec/ft3
Conversion Factor (hours to seconds): 3600 sec/hr
Input = (Htg. value x 3600) + seconds per cubic foot
Input = (1,000 BTU/ft3 x 3600 sec/hr) + 34 sec/ft3
Input = 106,000 BTU/hr
This measured input must not be greater than the input
indicated on the unit rating plate.
5. Turn ON gas and relight appliances turned off in step 1.
Ensure all the appliances are functioning properly and that
all pilot burners are operating.
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Air temperature rise is the temperature difference between supply
and return air. The proper amount of temperature rise is usually
obtained when the unit is operated at the rated input with the "as
shipped" blower speed. If the correct amount of temperature rise
is not obtained, it may be necessary to change the blower speed.
An incorrect temperature rise can cause condensing in or
overheating of the heat exchanger. Determine and adjust the
temperature rise as follows. The temperature rise must be within
the range specified on the rating plate .
Table 13 - Manifold Gas Pressure CAUTION
Manifold Gas Pressure
50
KBTU/H
Input Rating
Natural Gas
Range
4.3-4.7” W.C. 9.7-10.3” W.C.
70 3.5-3.8” W.C. 9.3-9.9” W.C.
80 3.6-4.0” W.C. 9.7-10.3” W.C.
90 3.6-4.0” W.C. 9.7-10.3” W.C.
100 4.0-4.4” W.C. 9.7-10.3” W.C.
110 3.6-4.0” W.C. 9.1-9.7” W.C.
120 4.3-4.7” W.C. 9.7-10.3” W.C.
135 4.3-4.7” W.C. 9.7-10.3” W.C.
Propane Gas