Bard 2100-066 Rev. A - Manual (Page 11)

which itemize the basic maintenance steps and assist in organizing
the service tasks to be performed.
It is suggested the service person attach the check sheet to a
clipboard and cany it to the service call. Filing in the checklists
while proceeding with the call will ensure that all the necessary
checks are performed efficiently. The check sheet should be
completed in duplicate. One copy is for the customer. The check
sheet folder copy is for the firm’s reference file.
The check sheet also has other potential uses. For example, listing
the make and model of the equipment gives the firm quick
reference for service and parts information. And by analyzing “time
in and out”, the firm can accumulate labor cost data on its planned
service operation. It is a valuable sales tool for add-on and
replacement and accessory business. Service personnel should
always keep this important aspect in mind. Tips that generate sales
will help you and your company grow. The maintenance sheet is a
convenient means to document this information.
The checks corrunon to all heating and cooling units, namely those
at the thermostat, blower and filter, will now be covered.
Pre-Service Check
□ Customer satisfied with system performance.
□ Customer dissatisfied with system performance.
1. The planned service appointment should be scheduled in
advance so that arrangements can be made to gain access to
the comfort equipment.
2. Prior to beginning the maintenance checks, the service person
should ask the customer how the system is performing. This
will help get a reading on current system operation and
pinpoint possible problems to investigate and correct.
3. If the customer indicates satisfaction with the system
operation, the service person can concentrate on the routine
maintenance checks.
Thermostat
Record thermostat settings:
Temp__________ °F Mode:
□ Cool Fan switch:
□ Heat □ Off
□ On □ Auto
1. Recording these settings will enable service personnel to
reset thermostat to customer’s desires at end of service call.
2, Some electric units may also employ an outdoor thermostat
for multiple staging of heat elements (see Electric Heat
Section). Record outdoor thermostat setting.
□ Check terminal connections for tightness.
1, Remove thermostat cover,
2, Tighten terminal connections if necessary.
□ Clean bimetal.
1. Carefully remove dust and dirt from bimetal with soft brush
or by blowing on it.
2. Inspect the mercury switch for cracks in the glass bulb and
brush away any accumulated dust. If mercury switch is
damaged, discuss problem with homeowner and notify
sales manager.
□ Check thermostat for level.
1. Place level on thermostat and adjust thermostat position if
not perfectly level. A level thermostat is a necessity for
precise temperature control.
□ Check control circuit amperage_ _amps.
1. Single-stage heating or cooling thermostat. Connect one clip
of 10 loop amperage multiplier to “power from transformer”
thermostat terminal; coimect other multiplier clip to
“heating” thermostat terminal if checking heating system or
“cooling” terminal if checking cooling system; snap amprobe
just around multiplier coil and record actual amperage draw
(move decimal point of amprobe reading one place to the left
to obtain actual amp draw, i.e. 4.5 reading ~ .45 actual amp
draw).
2. With two-stage heating thermostat. Check first stage circuit
amperage using method outlined above for single thermostat.
To check second stage circuit amperage, attach one jumper
wire clip to power terminal and other clip to “first stage heat”
terminals; attach one amperage multiplier clip to “power”
terminal; connect other multiplier clip to the “second stage
heating” thermostat terminal; record actual amperage draw
(by adjusting reading one decimal to tlie left).
□ If customer is dissatisfied with temperature control in heating
season, adjust heat anticipator setting to match control circuit
amp draw reading.
1. If customer is satisfied with temperature control, do not
adjust anticipator and proceed with next service check.
2, If during the heating season the customer complains of being
too hot even after the furnace has cycled off, the heat
anticipator setting should be adjusted to shorten the fiomace’s
“on” cycle; if the customer is too cool, the anticipator should
be adjusted to lengthen the “on” cycle. The cooling
anticipator is usually nonadjuslable. Review the thermostat
manual details on anticipator adjustment.