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During the Defrost cycle, output EHEAT is also energized

(if not already energized by a thermostat W2 demand);

supplemental heater will be energized. During the Defrost

Cycle, LED1 on the DFB will be illuminated. The Defrost

cycle ends when DFT opens (as liquid temperature exiting

the coil rises above DFT setpoint) or the defrost cycle runs

for 10 minutes. Output at EHEAT is removed;

supplemental heater will be de-energized (unless

thermostat has a W2 demand). Output at OF is restored;

outdoor fans start again. Output P3–7 (RVS1) is removed;

reversing valve returns to Heating position.

Defrost cycle is fixed at a maximum 10 minute duration

limit. The period to test and initiate a Defrost cycle can be

configured for 30, 60, 90 or 120 minutes.

Supplemental Heat/Emergency Heat —

Supplemental heat type is determined by 40RUQ indoor

unit options and accessories. This heat is initiated when

the indoor unit W2 terminal is energized by the

thermostat. (Or as detailed in “Defrost Cycle” on page

19.) The thermostat may energizes W2 as supplemental

(2nd stage) heat at larger space heating demand, or when

selected as emergency heat mode. When the space heating

demand decreases below the 2nd stage limit, or

emergency heat is turned off, W2 is de-energized, and

supplemental heat is turned off.

Cooling and Heating Shutdown —

Partial or complete cooling or heating functions may

shutdown caused by loss of main power, open pressure

switches, diagnostic alarms, or open internal compressor

protections. See Service section for further details.

ROUTINE SYSTEM MAINTENANCE

These items should be part of a routine maintenance

program, to be checked every month or two, until a

specific schedule for each can be identified for this

installation:

Quarterly Inspection (and 30 days after initial start) —

Indoor Section

S Coil cleanliness checked.

S Return air filter replacement

S Belt tension checked

S Belt condition checked

S Pulley alignment checked

S Fan shaft bearing locking collar tightness checked

S Condensate drain checked

S Blower motor amperage

Outdoor Section

S Fan motor mounting bolts tightness

S Compressor mounting bolts

S Fan blade positioning

S Control box cleanliness and wiring condition

S Wire terminal tightness

S Refrigerant charge level

Economizer or Outside Air Damper

S Inlet filters condition

S Check damper travel (economizer)

S Check gear and dampers for debris and dirt

SERVICE

Refrigeration System

EQUIPMENT DAMAGE HAZARD

Failure to follow this caution may result in damage to

equipment .

This system uses Puron

refrigerant which has higher

pressures than R--22 and other refrigerants. No other

refrigerant may be used in this system. Gage set,

hoses, and recovery system must be designed to

handle Puron

. If you are unsure consult the

equipment manufacturer.

CAUTION

Compressor Oil —

EQUIPMENT DAMAGE HAZARD

Failure to follow this caution may result in damage to

equipment .

The compressor in a Puron system uses a polyolester

(POE) oil. This oil is extremely hygroscopic, meaning

it absorbs water readily. POE oils can absorb 15 times

as much water as other oils designed for HCFC and

CFC refrigerants. Take all necessary precautions to

avoid exposure of the oil to the atmosphere.

CAUTION

Servicing Systems on Roofs with Synthetic Materials —

POE (polyolester) compressor lubricants are known to

cause long term damage to some synthetic roofing

materials. Exposure, even if immediately cleaned up, may

cause embrittlement (leading to cracking) to occur in one

year or more. When performing any service which may

risk exposure of compressor oil to the roof, take

appropriate precautions to protect roofing. Procedures

which risk oil leakage include but are not limited to

compressor replacement, repairing refrigerants leaks,

replacing refrigerant components such as filter drier,

pressure switch, metering device, coil, accumulator, or

reversing valve.

Synthetic Roof Precautionary Procedure:

1. Cover extended roof working area with an imper-

meable polyethylene (plastic) drop cloth or tarp.

Cover an approximate 10 x 10 ft (3.3 x 3.3 m) area.

38AUQ

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